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BEGIN:VEVENT
SUMMARY:Stability Conditions for the Horndeski Scalar Field Gravity Model
DTSTART;VALUE=DATE-TIME:20230531T135000Z
DTEND;VALUE=DATE-TIME:20230531T141500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-1000@cern.ch
DESCRIPTION:Speakers: Cláudio GOMES ()\nWe constrain the viable models of
Horndeski gravity after the GWs events by resorting to the Witten positiv
e energy theorem. We find that the free function G3(ϕ\,X) in the Lagrangi
an is con- strained to be a function solely of the scalar field\, G3(ϕ).
In addition\,relations among the free functions are found. Other criteria
for stability are also analysed\, such as the attractiveness of gravity\,
and the Dolgov-Kawasacki instability. Some applications for cosmology are
discussed.\n\nhttps://indico.unina.it/event/70/contributions/1000/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/1000/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resolving cosmological tensions with a sign-switching cosmological
constant
DTSTART;VALUE=DATE-TIME:20230601T101500Z
DTEND;VALUE=DATE-TIME:20230601T104000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-979@cern.ch
DESCRIPTION:Speakers: Ozgur AKARSU ()\nIn this talk\, inspired by the rece
nt conjecture originated from graduated dark energy (gDE) that the univers
e has transitioned from anti-de Sitter vacua to de Sitter vacua in the lat
e universe\, we will discuss the superior features of the $\\Lambda_{\\rm
s}$CDM model\, which extends the standard $\\Lambda$CDM model by a cosmolo
gical constant ($\\Lambda_{\\rm s}$) that switches sign at a certain redsh
ift $z_\\dagger$\, over the standard $\\Lambda$CDM model in the light of o
bservational data. We will first discuss that\, when the consistency of $\
\Lambda_{\\rm s}$CDM with the CMB data is ensured\, $H_0$ and $M_B$ values
are inversely correlated with $z_\\dagger$ and reach $H_0\\approx73.4~{\\
rm km\\\, s^{-1}\\\, Mpc^{-1}}$ and $M_B\\approx-19.25\\\,{\\rm mag}$ for
$z_\\dagger=1.6$\, in agreement with the SH0ES measurements\, and $H(z)$ e
xhibits an excellent fit to the Ly-$\\alpha$ data. We will then show that
the CMB alone is not able to well constrain $z_\\dagger$ and thus discrimi
nate between $\\Lambda_{\\rm s}$CDM and $\\Lambda$CDM models\, but the CMB
+BAO data set favors the sign switch of $\\Lambda_{\\rm s}$ providing the
constraint: $z_\\dagger=2.44\\pm0.29$. The further observational analysis
using more data sets reveals that $\\Lambda_{\\rm s}$CDM is significantly
favored over $\\Lambda$CDM\, and it resolves various tensions that prevail
within $\\Lambda$CDM\; for instance\, the CMB+Pan data set with $M_B$ pri
or gives $z_\\dagger=1.784^{+0.14}_{-0.18}$ along with $H_0\\approx72.38^{
+0.98}_{-1.10}~{\\rm km\\\, s^{-1}\\\, Mpc^{-1}}$\, $S_8=0.785\\pm0.012$\,
and $M_B=-19.290^{+0.026}_{-0.029}$\, all of which are consistent with th
eir local measurements\, and moreover that the physical baryon density val
ue\, $\\omega_b$\, better agrees with the BBN constraints on it and $H(z)$
exhibits excellent fit to the Ly-$\\alpha$ data. While using the CMB+Pan+
Ly-$\\alpha$ data set provides us with the similar constrains\, inclusion
of the low-redshift BAO data\, i.e.\, using CMB+Pan+BAO data set\, leads t
o some compromise in these improvements. We will close the talk with a dis
cussion on some other observational aspects and theoretical implications o
f the $\\Lambda_{\\rm s}$CDM model. This talk is based on the works ``Grad
uated dark energy: Observational hints of a spontaneous sign switch in the
cosmological constant" [Akarsu\, Barrow\, Escamilla\, and Vazquez\, PRD 1
01 (2020) 063528]\, ``Relaxing cosmological tensions with a sign switching
cosmological constant" [Akarsu\, Kumar\, Ozulker\, and Vazquez\, PRD 104
(2021) 123512]\, and ``Relaxing cosmological tensions with a sign switchin
g cosmological constant: Improved results with Planck\, BAO and Pantheon d
ata" [Akarsu\, Kumar\, Ozulker\, Vazquez\, and Yadav\, arXiv:2211.05742] a
nd several ongoing works by an extended group of leading researchers in th
e field of cosmology.\n\nhttps://indico.unina.it/event/70/contributions/97
9/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/979/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reconstructing the Universe properties
DTSTART;VALUE=DATE-TIME:20230531T132500Z
DTEND;VALUE=DATE-TIME:20230531T135000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-970@cern.ch
DESCRIPTION:Speakers: Alberto VAZQUEZ ()\n"In the absence of a fundamental
and well defined theory\, several parameterizations of cosmological funct
ions have been suggested to get insights of the general DE behaviour and h
ence to look for possible deviations from the cosmological constant.\nEven
though these parametric forms usually provide a better fit to the data\,
they have the limitation of assuming an a priori functional form which may
lead to some bias or misleading model-dependent results\, regardless of t
he DE nature. In this talk\, to avoid these possible issues\, non-parametr
ic and model-independent techniques are presented\, i.e. Gaussian process
and Artificial Neural Networks. They allow us to extract information direc
tly from the data to detect features within cosmological functions\, for i
nstance a decrease in the dark energy density component at early times and
a transition to the phantom divide-line in the EoS."\n\nhttps://indico.un
ina.it/event/70/contributions/970/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/970/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gamma-Ray Burst cosmology and future perspectives
DTSTART;VALUE=DATE-TIME:20230531T104000Z
DTEND;VALUE=DATE-TIME:20230531T110500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-968@cern.ch
DESCRIPTION:Speakers: Maria Giovanna DAINOTTI ()\n"Cosmological models and
their corresponding parameters are widely debated because of the current
discrepancy \nbetween the results of the Hubble constant\, H0\, obtained b
y SNe Ia\, and the Planck data from the cosmic microwave\n background radi
ation. Thus\, considering high redshift probes like gamma-ray bursts (GRBs
) is a necessary step. \nHowever\, using GRB correlations between their ph
ysical features to infer cosmological parameters is difficult \nbecause GR
B luminosities span several orders of magnitude. In our work\, we use a th
ree-dimensional relation \nbetween the peak prompt luminosity\, the rest-f
rame time at the end of the X-ray plateau\, \nand its corresponding lumino
sity in X-rays: the so-called 3D Dainotti fundamental plane relation. \nWe
correct this relation by considering the selection and evolutionary effec
ts with a reliable statistical method\,\nobtaining a lower central value f
or the intrinsic scatter\, σint = 0.18 ± 0.07 (47.1 per cent) compared \
nto previous results\, when we adopt a particular set of GRBs with well-de
fined morphological features\, \ncalled the platinum sample. We have used
the GRB fundamental plane relation alone with both Gaussian \nand uniform
priors on cosmological parameters and in combination with SNe Ia and BAO m
easurements \nto infer cosmological parameters like H0\, the matter densit
y in the universe (ΩM)\, and the dark energy \nparameter w for a wCDM mod
el. Our results are consistent with the parameters given by the Lambda col
d dark \nmatter model but with the advantage of using cosmological probes
detected up to z = 5\, much larger than \nthe one observed for the furthes
t SNe Ia. We also show how many GRBs we would need to have \nif we aim to
achieve the precision of SNe Ia as reached by the Pantheon sample \nby int
roducing a new GRB fundamental plane in optical wavelength."\n\nhttps://in
dico.unina.it/event/70/contributions/968/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/968/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Assessing the consistency of Cosmic Microwave Background observati
ons to probe new physics
DTSTART;VALUE=DATE-TIME:20230531T101500Z
DTEND;VALUE=DATE-TIME:20230531T104000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-967@cern.ch
DESCRIPTION:Speakers: Willam GIARE ()\nIn this talk I will discuss about t
he global agreement between the most recent observations of the Cosmic Mic
rowave Background temperature and polarization anisotropies. I will point
out some emergent anomalies that cannot be fully understood within the sta
ndard ΛCDM model of cosmology\, hinting at significant unaccounted-for sy
stematics in the CMB data or at basic missed ingredients in the theory. Ei
ther way\, I will show that these anomalies are responsible for a global
“CMB tension” between independent experiments that persists also in ex
tended background cos- mologies and analyze the implications for new physi
cs beyond ΛCDM.\n\nhttps://indico.unina.it/event/70/contributions/967/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/967/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Pantheon+ Supernova Sample and Cosmological Constraints
DTSTART;VALUE=DATE-TIME:20230530T161000Z
DTEND;VALUE=DATE-TIME:20230530T163500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-962@cern.ch
DESCRIPTION:Speakers: Dillon BROUT ()\nI will detail leaps of progress in
Type Ia Supernova Cosmology (SNIa) that have culminated in the recent Pant
heon+ cosmological analysis of 1701 SNIa light curves. While this SN datas
et places strong constraints on dark matter\, dark energy and solidify Lam
bda CDM\, Pantheon+ is also used in the recent SH0ES constraints of the lo
cal value of the Hubble Constant (the current expansion rate of the univer
se) that are now in 5sigma tension with the inferred value from the cosmic
microwave background. I will detail the formulation of the SN dataset\, i
nternal consistency checks\, and our robust treatment of systematic uncert
ainties that have built confidence in the cosmological measurements and th
at also pave the path for future surveys.\n\nhttps://indico.unina.it/event
/70/contributions/962/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/962/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Intrinsic tension in the supernovae sector of the local Hubble con
stant measurement and its implications
DTSTART;VALUE=DATE-TIME:20230530T154500Z
DTEND;VALUE=DATE-TIME:20230530T161000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-961@cern.ch
DESCRIPTION:Speakers: Radoslaw WOJTAK ()\nI will start my talk with a brie
f critical review of cosmological proposals put forward as potential so- l
utions to the Hubble constant tension. I will argue that the lack of decis
ive observational evidence supporting any of the current models should mot
ivate our community to reassess the risk-to-gain ratio of this line of res
earch and perhaps restore a balance between the efforts put in testing a w
ide range of possible testing systematic effects in the measurements of th
e Hubble constant and ad hoc modifications of the standard cosmological mo
del. In the second part of my talk\, I will discuss a new reanalyses of Ce
pheid and type Ia supernova data used in the local determination of the Hu
bble constant. I will show the evidence of a discrepancy between the colou
r correction of supernovae in the calibration sample and the Hubble flow.
This discrepancy is currently an intrinsic tension in the local determinat
ion of the Hubble constant and a source of unaccounted systematic errors.
I will show that applying supernova standardisation which accounts for thi
s anomaly by resolving two different observationally and theoretically mot
ivated supernova popu- lations related to two progenitor channels and dust
extinction in their environments\, yields the Hubble constant which is co
nsistent with the Planck value. The new standardisation method is based on
a novel Bayesian hierarchical model of type Ia supernovae which explains
completely the Hubble residuals arising from the standard method of supern
ova standardisation in terms of extinction and intrinsic properties of sup
ernovae originating from two observationally motivated populations (fast/s
low decliners correlated with old/young stellar populations). I will give
a brief overview of this model\, the current constraints and the perspecti
ves of using it in cosmological analyses of type Ia supernovae.\n\nhttps:/
/indico.unina.it/event/70/contributions/961/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/961/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Standard Siren Cosmology with Gravitational Waves from Binary Blac
k Hole Mergers in Active Galaxy Nuclei
DTSTART;VALUE=DATE-TIME:20230530T102500Z
DTEND;VALUE=DATE-TIME:20230530T105000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-956@cern.ch
DESCRIPTION:Speakers: Clecio BOM ()\nThe detection of gravitational Waves
(GW) has opened a new window for cosmology. The cur- rent tension between
the measurement of the Hubble constant H0 from Cosmic Microwave Back- grou
nd and Supernova analyses makes an independent\, standard siren measuremen
t of H0 from gravitational waves particularly interesting. However\, up to
date the astronomical community has confidently identified only one optic
al counterpart to a GW event\, a neutron star merger\, GW170817. In the ca
ses where no counterpart is identified/expected such as Binary Black Hole
(BBHs) events\, it is possible to use a statistical approach\, also known
as the “dark siren” method\, to produce individually weaker constraint
s. This method provides a less precise cosmological con- straint on an eve
nt-to-event basis\, due to the typically large number of galaxies over whi
ch one needs to marginalize. Current constraints suggest that from ˜20% t
o 80% of LIGO/Virgo/KAGRA BBHs are associated with Active Galactic Nuclei
(AGN) disks. The claim for a possible association of the BBH merger GW1905
21 with a flare in the AGN J124942.3+344929\, alongside to the several pro
posed models and mechanisms to make a viable EM counterpart from BBHs in a
ccretion disks suggested this might be a promising endeavor. Therefore\, w
e explore the possibility of Standard Sirens in association with AGN hosts
and AGN flares\, through an hybrid method between bright and dark sirens.
We simulate GW events from future LIGO/Virgo/KAGRA runs and derive the ex
pected constraints in H0\, Ωm\, and dark energy equation of state parame
ter w. Depending on the fraction of AGN hosts and BBHs capable of flare we
might obtain H0 from from ˜ 10% (pes- simistic) to ˜ 3% (optimistic) le
vel in the next few years. We also show that the method could be applied t
o all possible AGNs hosts not requiring a flare in the GW localization are
a to prospect the cosmological constraints.\n\nhttps://indico.unina.it/eve
nt/70/contributions/956/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/956/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Public Talk in Portuguese -- Einstein's greatest mistake? The disc
overy of the cosmological constant
DTSTART;VALUE=DATE-TIME:20230601T173000Z
DTEND;VALUE=DATE-TIME:20230601T180000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-989@cern.ch
DESCRIPTION:Speakers: Elsa TEIXEIRA ()\nhttps://indico.unina.it/event/70/c
ontributions/989/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/989/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Public talk in English -- Are we approaching a revolution in physi
cs?
DTSTART;VALUE=DATE-TIME:20230601T180000Z
DTEND;VALUE=DATE-TIME:20230601T183000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-988@cern.ch
DESCRIPTION:Speakers: Emmanuel SARIDAKIS ()\nhttps://indico.unina.it/event
/70/contributions/988/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/988/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Galaxy clustering systematic effects in photometric surveys
DTSTART;VALUE=DATE-TIME:20230601T160000Z
DTEND;VALUE=DATE-TIME:20230601T162500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-987@cern.ch
DESCRIPTION:Speakers: Ignacio SEVILLA ()\nGalaxy clustering is one of the
pillars of current cosmological parameter constraints\, in particular for
understanding the properties of the late universe and how they relate to t
hose predicted from early universe measurements\, in combination with cosm
ic shear observations. In photometric surveys\, spurious correlations may
be introduced by the spatial distribution of observational con- ditions an
d astrophysical properties over the sky. We make a short overview of how t
his problem is tackled in the Dark Energy Survey\, as well as in other pro
jects of its kind.\n\nhttps://indico.unina.it/event/70/contributions/987/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/987/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The halo mass function in clustering dark energy models as a tool
versus the sigma8 tension
DTSTART;VALUE=DATE-TIME:20230601T153500Z
DTEND;VALUE=DATE-TIME:20230601T160000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-986@cern.ch
DESCRIPTION:Speakers: Francesco PACE ()\n"When N-body simulations deal wit
h dark energy\, they consider its effect only at the background level\, mo
difying the Hubble expansion. A notable exception is the K-evolution code
which simulates k-essence models with a low sound-speed using the effectiv
e field theory approach at the non-linear level. It has been demonstrated
that this leads to divergences. Hence\, a few authors recently proposed to
investigate this issue by developing a code which can simulate a dark ene
rgy fluid in a way analogous to what normally done with dark matter and ba
ryons modifying the Euler equation taking into account pressure contributi
ons.\nIn this talk I will explore the effects of this additional term in t
he formalism of the spherical collapse model and show how the evolution of
perturbations compare to the standard equations and how the halo mass fun
ction is modified. A modification in the evolution of perturbations\, also
taking into account dark energy perturbations\, will lead to a different
normalization of the matter power spectrum\, sigma8. This quantity can be
further constrained with observed measurements of the halo mass function a
nd indicate whether the sigma8 tension is alleviated or enhanced."\n\nhttp
s://indico.unina.it/event/70/contributions/986/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/986/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Varying alpha through the dynamics of dark energy
DTSTART;VALUE=DATE-TIME:20230601T151000Z
DTEND;VALUE=DATE-TIME:20230601T153500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-985@cern.ch
DESCRIPTION:Speakers: Vitor DA FONSECA ()\nWe propose a cosmological model
that predicts the variation of the fine structure constant α with redshi
ft\, where the electromagnetic sector couples to the kinetics of a canonic
al scalar field ϕ. This is a generalization of the usual linear dependenc
e of the interaction term on ϕ. This theory can be seen as a disformal co
upling with radiation\, where the conformal factor depends on the kinetic
term of the scalar source. We have studied the phenomenology of the model
by particularizing the scalar field as the quintessence component driving
the current acceleration. We found the remarkable feature that the evoluti
on of α follows the Hubble flow\, slowing down at late times during dark
energy dominance. We have constrained the free parameters with measurement
s of BBN\, Planck\, quasar absorption spectra\, atomic clocks\, and tests
of the weak equivalence principle. The variation of the recombination reds
hift leads to a geometric degeneracy between $\\alpha$ and $H_0$\, which c
an tackle the Hubble tension.\n\nhttps://indico.unina.it/event/70/contribu
tions/985/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/985/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Can the simplest generalizations of the null inertial mass density
alleviate the H0 tension?
DTSTART;VALUE=DATE-TIME:20230601T144500Z
DTEND;VALUE=DATE-TIME:20230601T151000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-984@cern.ch
DESCRIPTION:Speakers: Nihan KATIRCI ()\n"In this talk\, we overview dark e
nergy models with negative energy density values in the past can alleviate
the H0 tension. We investigate whether two minimal extensions of the ΛCD
M model\, to- gether or separately\, can successfully realize such a scena
rio: (i) the spatial curvature\, which\, in the case of spatially closed u
niverse\, mimics a negative density source and (ii) graduated and simple-
graduated dark energy\, which promote the null inertial mass density of th
e usual vacuum energy to an arbitrary function/constant–if negative\, th
e corresponding energy density decreases with redshift similar to the phan
tom models\, but unlike them crosses below zero at a certain redshift. We
find that\, a spatially closed universe along with a simple-gDE of positiv
e inertial mass density\, which work in contrast to each other\, results i
n minor improvement to the H0 tension. The joint dataset\, BAO+SN+H+PLK pr
esents no evidence for a deviation from spatial flatness but almost the sa
me evidence for a cosmological constant and the simple-gDE with an inertia
l mass density of order O(10ˆ{-12}) eVˆ4. We will talk about further ine
rtial mass density parameterizations such as linear/oscillatory generaliza
tions in scale factor as well as redshift of the vacuum energy. We then wi
ll close the talk with the possibility of obtaining effective sources such
varying inertial mass densities from modified theories/extensions of grav
ity as like the constant inertial mass density (Simple gDE ) arises from b
arotropic perfect fluid via the energy-momentum squared gravity of the log
arithmic form.\nThis talk is based on the works:\n[1] Simple-graduated dar
k energy and spatial curvature\, G. Acquaviva\, Ö. Akarsu\, N. Katirci\,
J. A. Vazquez\, Phys. Rev.D 104 (2021) 2\, 023505\, 2104.02623 [astro-ph.C
O]. [2] Screening Λ in a new modified gravity model\, Ö. Akarsu\, J. D.
Barrow\, C.V.R. Board\, N.M. Uzun\, J. A. Vazquez\, Eur.Phys.\nJ.C 79 (201
9) 10\, 846\, 1903.11519 [gr-qc]. [3]Graduated dark energy: Observational
hints of a spontaneous sign switch in the cosmological constant\, Ö. Akar
su\, J. D. Barrow\, L.A. Escamilla\, J.\nA. Vazquez\, Phys.Rev.D 101 (2020
) 6\, 063528 1912.08751 [astro-ph.CO]. [4] Dynamical analysis of logarithm
ic energy-momentum squared gravity\, G. Acquaviva\, N. Katirci\, 2203.0123
4 [gr-qc]."\n\nhttps://indico.unina.it/event/70/contributions/984/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/984/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tomographic cross-correlation of the CMB lensing and galaxy cluste
ring - systematic errors from cross-talk between redshift bins of galaxies
DTSTART;VALUE=DATE-TIME:20230601T132500Z
DTEND;VALUE=DATE-TIME:20230601T135000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-982@cern.ch
DESCRIPTION:Speakers: Pawel BIELEWICZ ()\nThe effect of gravitational lens
ing of the cosmic microwave background (CMB) provides a unique opportunity
to obtain a picture of the gravitational potential of the large-scale str
ucture of the Universe at very high redshifts. Tomographic cross-correlati
on of the gravitational potential with other tracers of the large-scale st
ructure at known redshifts allows tracing the evolution of the structure a
nd testing cosmological models. However\, the analysis of upcoming data wi
ll require a very good understanding of any systematic errors that may bia
s cross-correlation measurements. In this talk we will present studies of
systematic errors arising from cross-talk between redshift bins of galaxie
s with photometric redshift uncertainties. We show their impact on the cro
ss-correlation measurement and cosmological parameter estimates for future
data sets. We also present an efficient method for removing the errors.\n
\nhttps://indico.unina.it/event/70/contributions/982/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/982/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological implications of Weyl geometric gravity
DTSTART;VALUE=DATE-TIME:20230601T130000Z
DTEND;VALUE=DATE-TIME:20230601T132500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-981@cern.ch
DESCRIPTION:Speakers: Tiberiu HARKO ()\nWe investigate the dark energy in
the Weyl geometric gravity\, which is based on the introduction of a Weyl
connection to describe the gravitational properties of the space-time. We
consider the case in which the Lagrangian is given by the sum of the squar
e of the Weyl scalar\, of the strength of the field associated to the Weyl
vector\, and a conformally invariant geometry-matter coupling term\, cons
tructed from the matter Lagrangian and the Weyl scalar. The action is line
arized in the Ricci scalar by introducing an auxiliary scalar field. After
substituting the Weyl scalar in terms of its Riemannian counterpart\, the
quadratic Wedyl action is defined in Riemann geometry\, and involves a no
nminimal coupling between geometry and matter. The field equations are obt
ained by varying the action with respect to the metric\, the scalar field\
, and the Weyl vector. The cosmological implications of the Weyl geometric
gravity field equations are investigated for different forms of the Weyl
vector-matter Lagrangian coupling functions. From the generalized Friedman
n equations of the model\, obtained by assuming that the background Rieman
nian metric is of the Friedmann- Lemaitre-Robertson-Walker type\, an effec
tive geometric dark energy component can be generated\, with the effective
\, geometric type pressure. A comparison with the standard ΛCDM model is
also performed\, and we find that the Weyl geometric gravity type cosmolog
ical models can give an acceptable description of the cosmological observa
tions.\n\nhttps://indico.unina.it/event/70/contributions/981/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/981/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological Tensions in a Coupled Dark Sector
DTSTART;VALUE=DATE-TIME:20230601T104000Z
DTEND;VALUE=DATE-TIME:20230601T110500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-980@cern.ch
DESCRIPTION:Speakers: Elsa TEIXEIRA ()\nReconciling the standard model’s
theoretical predictions with precision measurements from mul- tiple probe
s stands as one of the most pressing challenges of modern cosmology. Durin
g the last decade\, increasing evidence for persistent discrepancies in th
e value of cosmological param- eters when inferred from model-dependent an
d -independent probes opened the door for a new paradigm. In this talk\, I
will address whether (part of) the cosmological tensions can be attribute
d to missing physics in the standard model. In particular I will focus on
tests of different models with interactions between dark energy and dark m
atter.\n\nhttps://indico.unina.it/event/70/contributions/980/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/980/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fast test to assess the impact of marginalization in Monte Carlo a
nalyses and its application to cosmology
DTSTART;VALUE=DATE-TIME:20230601T095000Z
DTEND;VALUE=DATE-TIME:20230601T101500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-978@cern.ch
DESCRIPTION:Speakers: Adrià GÓMEZ-VALENT ()\nMonte Carlo (MC) algorithms
are commonly employed to explore high-dimensional parameter spaces constr
ained by data. All the statistical information obtained in the output of t
hese analyses is contained in the Markov chains\, which one needs to proce
ss and interpret. The marginaliza- tion technique allows us to digest thes
e chains and compute the posterior distributions for the parameter subsets
of interest. In particular\, it lets us draw confidence regions in two-di
mensional planes\, and get the constraints for the individual parameters.
It is very well known\, though\, that the marginalized results can suffer
from volume effects\, which can introduce a non-negligible bias into our c
onclusions. The impact of these effects are barely studied in the literatu
re. In this talk I first illustrate the problem through a very clear and s
imple example in two dimensions\, and sug- gest the use of the profile dis
tributions (PDs) as a complementary tool to detect marginalization biases
directly from the MC chains. I apply this method to four cosmological mode
ls: the standard ΛCDM\, early dark energy\, coupled dark energy and the B
rans-Dicke model with a cosmological constant. I discuss the impact of the
volume effects on each model and the cosmological tensions\, using the fu
ll Planck 2018 likelihood\, the Pantheon compilation of supernovae of type
Ia and data on baryon acoustic oscillations. This test is very efficient
and can be easily applied to any MC study. It allows us to estimate the PD
s at a derisory computational cost not only for the main cosmological para
meters\, but also for the nuisance and derived ones\, and to assess the ne
ed to perform a more in-depth analysis with the exact computation of the P
Ds. This talk is based on Phys.Rev.D 106 (2022) 6\, 063506 [arXiv:2203.162
85].\n\nhttps://indico.unina.it/event/70/contributions/978/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/978/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmic Neutrino Background: Status\, Perspectives\, and Potential
Resolution of Current Tensions
DTSTART;VALUE=DATE-TIME:20230601T084000Z
DTEND;VALUE=DATE-TIME:20230601T092000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-977@cern.ch
DESCRIPTION:Speakers: Alessandro MELCHIORRI ()\nThe cosmic neutrino backgr
ound\, a relic of the early universe\, represents a fundamental aspect of
cosmic particle physics. This talk provides an overview of the current sta
tus and perspectives regarding the cosmic neutrino background\, while also
exploring the possibility of resolving current tensions.\n\nhttps://indic
o.unina.it/event/70/contributions/977/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/977/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensions in Cosmology: A signal of modified gravity?
DTSTART;VALUE=DATE-TIME:20230601T080000Z
DTEND;VALUE=DATE-TIME:20230601T084000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-976@cern.ch
DESCRIPTION:Speakers: Emmanuel SARIDAKIS ()\nIt is quite possible that the
tensions between various observational datasets and theoretical predictio
ns of the Standard Model of Gravity and Cosmology\, such as the H0 and S8
tensions\, could be a sign that we are approaching New Physics. Among the
various possible solutions/alleviations\, the ones bases on modifications
/extensions of General Relativity may be the most promising.\n\nhttps://in
dico.unina.it/event/70/contributions/976/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/976/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Time Delay Cosmography with Strongly Lensed Quasars
DTSTART;VALUE=DATE-TIME:20230531T160000Z
DTEND;VALUE=DATE-TIME:20230531T162500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-975@cern.ch
DESCRIPTION:Speakers: Fred COURBIN ()\nThe arrival time of photons in the
different lensed images of distant quasars can be measured from long and w
ell-sampled light curves. This has been pioneered by the COSMOGRAIL\, H0Li
COW and TDCOSMO programs and will soon been follow-up with Rubin-LSST. Tim
e delays are inversely proportional to H0 and agree with local H0 measurem
ents such as SH0ES. I will present some of the recent results from the TDC
OSMO collaboration and show how the field of time delay cosmography can be
used in the future to measure H0 and narrow down the error bars.\n\nhttps
://indico.unina.it/event/70/contributions/975/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/975/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Current data are consistent with flat spatial hypersurfaces in the
LCDM but favor more lensing than the model predicts
DTSTART;VALUE=DATE-TIME:20230531T153500Z
DTEND;VALUE=DATE-TIME:20230531T160000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-974@cern.ch
DESCRIPTION:Speakers: Javier DE CRUZ PÉREZ ()\nWe study the performance o
f three pairs of tilted ΛCDM cosmological models\, two pairs allowing for
non-flat spatial hypersurfaces with CMB temperature and polarization powe
r spectrum data (P18) from Planck\, P18 lensing (lensing)\, and non-CMB da
ta (non-CMB). For the six models\, we measure cosmological parameters and
study whether or not pairs of the data sets are mutually consistent in the
se models. Half of these models allow the lensing consistency parameter AL
to be an additional free parameter\, while the other three have AL=1. In
the tilted non-flat models with AL=1 we find differences between P18 data
and non-CMB data cosmological parameter constraints. While both P18 data a
nd non-CMB data separately favor a closed geometry when P18+non-CMB data a
re jointly analyzed the evidence in favor of non-flat hypersurfaces subsid
es. Differences between P18 data and non-CMB data cosmological constraints
subside when AL is allowed to vary. From the most restrictive P18+lensing
+non-CMB data combination we get almost model- independent constraints and
find that the AL>1 option is preferred over the Ωk<0 one\, with the AL
parameter\, for all models\, being larger than unity by ∼ 2.5σ. Accordi
ng to the deviance information criterion\, in the P18+lensing+non-CMB anal
ysis\, the varying AL option is on the verge of being strongly favored ove
r the AL=1 one\, which could indicate a problem for the standard tilted fl
at ΛCDM model\n\nhttps://indico.unina.it/event/70/contributions/974/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/974/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Enhanced weak lensing cosmology with the lensing PDF
DTSTART;VALUE=DATE-TIME:20230531T151000Z
DTEND;VALUE=DATE-TIME:20230531T153500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-973@cern.ch
DESCRIPTION:Speakers: Benjamin GIBLIN ()\nWeak lensing cosmology stands at
a crossroads\, with cosmological tensions between cosmic shear experiment
s and those from Planck’s analysis of the CMB hinting at either undiscov
ered physics or unaccounted-for systematics. In response to this mystery\,
we present a new weak lensing statis- tic capable of vastly enhancing cos
mological inference. The “lensing PDF” - or the distribution of projec
ted structures in various density bins - directly probes non-Gaussianities
in large-scale structure\, extracting extra cosmological information beyo
nd the reach of two-point statistics con- ventionally employed in this fie
ld. Using numerical simulations tailored to match upcoming data from LSST\
, I demonstrate that lensing PDFs outperform standard lensing probes by >9
0% in con- straining the matter energy density and amplitude of the matter
power spectrum. This approach consequently presents a promising means to
shed light on the observed cosmological discordance.\n\nhttps://indico.uni
na.it/event/70/contributions/973/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/973/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Is H0 a constant?
DTSTART;VALUE=DATE-TIME:20230531T141500Z
DTEND;VALUE=DATE-TIME:20230531T144000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-972@cern.ch
DESCRIPTION:Speakers: Eoin O COLGAIN ()\nUsing a combination of mathematic
s and data analysis\, I will explain why evolution of the Lambda- CDM cosm
ological parameters with effective redshift is expected. I will review obs
ervations show- ing such trends and explain why they tilt the cosmological
tensions debate away from systematics and towards missing physics.\n\nhtt
ps://indico.unina.it/event/70/contributions/972/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/972/
END:VEVENT
BEGIN:VEVENT
SUMMARY:DE models with combined H0⋅rd from BAO and CMB dataset and frien
ds
DTSTART;VALUE=DATE-TIME:20230601T135000Z
DTEND;VALUE=DATE-TIME:20230601T141500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-971@cern.ch
DESCRIPTION:Speakers: Denitsa STAICOVA ()\nIt has been theorized that Dyna
mical Dark Energy (DDE) could be a possible solution to the Hubble tension
. To avoid the degeneracy between the Hubble parameter H0 and the sound ho
rizon scale rd\, we use their multiplication as one parameter c/(H0rd). To
the BAO points we add the SNIa Pantehon dataset and GRB dataset and the p
oints from the CMB priors. We use different DE parametrizations to constra
in the cosmological parameters and we compare the results based on statist
ical measures. We compare the results with the ones obtained by marginaliz
ing over the H0⋅rd by redefining the likelihood in a BAO and SNIa datase
ts.\n\nhttps://indico.unina.it/event/70/contributions/971/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/971/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Searching for hidden signals or systematics in the Pantheon+ and S
H0ES SnIa samples
DTSTART;VALUE=DATE-TIME:20230531T130000Z
DTEND;VALUE=DATE-TIME:20230531T132500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-969@cern.ch
DESCRIPTION:Speakers: Leandros PERIVOLAROPOULOS ()\nThe standard analysis
of the Pantheon+ and SH0ES SnIa samples assumes that the SnIa absolute mag
nitude parameter M can be standardized to a single and isotropic value. If
these assumptions are withdrawn and in particular if a transition of M is
allowed at some distance scale from M_< at low distances to M_> at high d
istances then the quality of fit to the Pantheon+ data improves significan
tly and the two best fit values M_ are at about 2-3\\sigma tension with ea
ch other. The origin of this effect is a combination of the uncorrected vo
lumetric redshift bias systematic and a mild transition signal of the intr
insic SnIa luminosity at a distance of about 20Mpc. The implications of th
is inhomogeneity for the Hubble tension and the best fit values of cosmolo
gical parameters will be discussed. The isotropy of the SnIa absolute magn
itude parameter and its dependence on distance bins will also be discussed
using the hemisphere comparison method.\n\nhttps://indico.unina.it/event/
70/contributions/969/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/969/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmic Tsunamis in Modified Gravity: Disruption of Screening Mecha
nisms from Scalar Waves
DTSTART;VALUE=DATE-TIME:20230531T095000Z
DTEND;VALUE=DATE-TIME:20230531T101500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-966@cern.ch
DESCRIPTION:Speakers: David MOTA ()\nExtending general relativity by addin
g extra degrees of freedom is a popular approach for explaining the accele
rated expansion of the Universe and to build high energy completions of th
e theory of gravity. The presence of such new degrees of freedom is\, howe
ver\, tightly constrained from several observations and experiments that a
im to test general relativity in a wide range of scales. The viability of
a given modified theory of gravity\, therefore\, strongly depends on the e
xistence of a screening mechanism that suppresses the extra degrees of fre
edom. We perform simulations\, and find that waves propagating in the new
degrees of freedom can significantly impact the efficiency of some screeni
ng mechanisms\, thereby threatening the viability of these modified gravit
y theories.\n\nhttps://indico.unina.it/event/70/contributions/966/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/966/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark energy\, our faster universe and its breaker' galaxies
DTSTART;VALUE=DATE-TIME:20230530T111500Z
DTEND;VALUE=DATE-TIME:20230530T115500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-965@cern.ch
DESCRIPTION:Speakers: Olga MENA ()\nWe shall review the landscape of dark
energy models\, focusing on non-minimal cosmologies which exhibit a coupli
ng among the dark sectors of the theory\, that is\, an energy flow among
dark energy and dark matter. Such a very appealing possibility may allevia
te the current mismatch in the observations of the Hubble constant. It cou
ld also play a non-negligible role in the recent results of the JWST-teles
cope\n\nhttps://indico.unina.it/event/70/contributions/965/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/965/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Ups and Downs of Early Dark Energy
DTSTART;VALUE=DATE-TIME:20230531T080000Z
DTEND;VALUE=DATE-TIME:20230531T084000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-964@cern.ch
DESCRIPTION:Speakers: Vivian POULIN ()\nEarly Dark Energy (EDE)\, an addit
ional component of dark energy active in the decade of redshift before rec
ombination\, has emerged as one of the most effective models at resolving
the Hubble tension. By reducing the size of the `sound horizon’ that cal
ibrates CMB and BAO observations\, it is able to fit a variety of datasets
including the variety of high-H0 measurements\, and may shed light upon t
he yet-unknown nature of dark energy\, and even inflation. Yet\, it is cl
ear that EDE cannot be `the end of the story’ at least in its current fo
rm\, as it brings up a number of theoretical and observational issues. In
this talk\, I will review the current status of EDE models\, highlighting
both the successes and challenges that EDE is facing\, and draw implicatio
ns of what we have learned about EDE towards establishing a new ``concorda
nce cosmology’’.\n\nhttps://indico.unina.it/event/70/contributions/964
/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/964/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new constraint on the expansion history of the Universe with cos
mic chronometers in VANDELS
DTSTART;VALUE=DATE-TIME:20230530T084000Z
DTEND;VALUE=DATE-TIME:20230530T090500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-963@cern.ch
DESCRIPTION:Speakers: Elena TOMASETTI ()\nIn the era of precision cosmolog
y\, exploring new and complementary approaches to measure the expansion hi
story of the Universe is crucial to increase the accuracy in the measureme
nts and keep systematic effects under control. A novel approach that provi
des cosmology-independent constraints on the Hubble parameter is based on
the analysis of the differential age evolution of massive and passively ev
olving galaxies as “cosmic chronometers” (CC).\nIn this talk\, I will
present a new measurement of H(z) at z~1.26 obtained from the analysis of
a sam- ple of CC extracted from the survey VANDELS. In our work\, we explo
re the feasibility of deriving accurate and robust differential ages from
full-spectrum fitting in the range 1 < z < 1.5\, derive the physical prope
rties of the population\, study in details the associated systematic uncer
tainties\, and propagate those to the total error budget. These data are u
sed both to derive a new measurement of the Hubble constant H0 (assuming a
cosmological model) and to derive a cosmology independent estimate of the
Hubble parameter at z∼1.26. I will conclude discussing how this measure
ment can contribute to shed some light on the H0 tension\, and the potenti
al of this method.\n\nhttps://indico.unina.it/event/70/contributions/963/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/963/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Minimizing systematics with CLONES (Constrained LOcal & Nesting En
vironment Simulations)
DTSTART;VALUE=DATE-TIME:20230530T152000Z
DTEND;VALUE=DATE-TIME:20230530T154500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-960@cern.ch
DESCRIPTION:Speakers: Jenny SORCE ()\nTo understand dark matter and energy
\, large cosmological surveys are designed to reach a few percent precisio
n. To be fully exploited\, this large quantity of data needs to be analyze
d in light of cosmological simulations. Preliminary analyses brought out t
ensions between the standard cosmological model and observations. Reaching
a 1% precision\, systematics of the same order of magnitude\, due to our
cosmic environment\, our survey specificities and our tool properties\, pr
obably rise out. Analyses need to be fueled with a new type of cosmologica
l simulations designed to reproduce our cosmic environment. Such simulatio
ns\, that I named CLONES (Constrained LOcal & Nesting Environment Simulati
ons)\, could provide a robust methodological framework to minimize these s
ystematic errors. I will introduce the CLONES giving a few study examples.
CLONES are a promising tool to increase our capacity to evade biases in f
uture survey analyses.\n\nhttps://indico.unina.it/event/70/contributions/9
60/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/960/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Systematics of stellar standard candles for an accurate distance l
adder and H0
DTSTART;VALUE=DATE-TIME:20230530T141000Z
DTEND;VALUE=DATE-TIME:20230530T145000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-959@cern.ch
DESCRIPTION:Speakers: Richard ANDERSON ()\nThe extragalactic distance ladd
er measures the Hubble constant using type-Ia supernovae whose absolute ca
libration relies on stellar standard candles\, such as classical Cepheids
and the TRGB method. Understanding the implications of the Hubble constant
tension requires careful consideration of the systematics of stellar stan
dard candles. This presentation reviews recent improvements in the quantif
ication and mitigation of systematics affecting stellar standard candle di
stances. In turn\, I make the case that both TRGB and Cepheids provide con
sistent H0 values that are in significant tension with Planck.\n\nhttps://
indico.unina.it/event/70/contributions/959/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/959/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Local Value of the Hubble Constant
DTSTART;VALUE=DATE-TIME:20230530T133000Z
DTEND;VALUE=DATE-TIME:20230530T141000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-958@cern.ch
DESCRIPTION:Speakers: Adam RIESS ()\nI will review local measurements of t
he Hubble constant using the distance ladder and data from Gaia EDR3\, HST
\, JWST\, Pantheon +\, SH0ES and a range of techniques and tools.\n\nhttps
://indico.unina.it/event/70/contributions/958/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/958/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Building the high-redshift Hubble Diagram with quasars
DTSTART;VALUE=DATE-TIME:20230530T105000Z
DTEND;VALUE=DATE-TIME:20230530T111500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-957@cern.ch
DESCRIPTION:Speakers: Matilde SIGNORINI ()\nIn recent years\, quasars have
shown to be standardizable candles\, allowing us to extend the Hub- ble D
iagram from the Supernovae Ia range (z ˜ 0-1.5) up to very high redshift
(z ˜ 6)\, and therefore explore the expansion history of the Universe at
previously uninvestigated epochs. This implemen- tation has shown the pres
ence of a strong tension (>4σ) with a standard flat ΛCDM model\, and ind
ications in favor of Interacting Dark Sector alternative models. In this t
alk\, I will first discuss the reliability of quasars as standard candles\
, focusing on possible sources of biases and systemat- ics and how we can
address them to build a valid quasar sample for cosmology. I will then foc
us on the observed dispersion of the luminosities relation\, describing it
s possible causes and if and how we can lower it to get more precise dista
nce measurements. Finally\, I will discuss the high-redshift tension with
the standard flat ΛCDM model.\n\nhttps://indico.unina.it/event/70/contrib
utions/957/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/957/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological parameters via HII galaxies and systematic uncertaint
ies
DTSTART;VALUE=DATE-TIME:20230530T100000Z
DTEND;VALUE=DATE-TIME:20230530T102500Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-955@cern.ch
DESCRIPTION:Speakers: Ricardo CHÁVEZ MURILLO ()\nWe present independent d
eterminations of cosmological parameters using the distance estimator base
d on the established correlation between the Balmer line luminosity\, L(H
β)\, and the velocity dispersion (σ) for HII galaxies (HIIG). We also ex
plore in detail the systematic uncertainties associ- ated with HIIG as a c
osmological tracer. These results are based on new VLT-KMOS high spectral
resolution observations of 41 high-z (1.3 < z < 2.6) HIIG combined with pr
eviously obtained data for 45 high-z and 107 local HIIG\n\nhttps://indico.
unina.it/event/70/contributions/955/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/955/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analyzing the Large-Scale Bulk Flow using CosmicFlows4: Increasing
Tension with the Standard Cosmological Model
DTSTART;VALUE=DATE-TIME:20230530T090500Z
DTEND;VALUE=DATE-TIME:20230530T093000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-954@cern.ch
DESCRIPTION:Speakers: Richard WATKINS ()\nWe present an estimate of the bu
lk flow in a volume of radii 150 200h−1Mpc using the minimum variance (M
V) method with data from the CosmicFlows4 (CF4) catalog. The addition of n
ew data in the CF4 has resulted in an increase in the estimate of the bulk
flow in a sphere of radius 150h−1Mpc relative to the CosmicFlows3 (CF3)
. This bulk flow has less than a 0.03% chance of occurring in the Standard
Cosmological Model (ΛCDM) with cosmic microwave background derived param
eters. Given that the CF4 is deeper than the CF3\, we were able to use the
CF4 to accurately estimate the bulk flow on scales of 200h−1Mpc (equiva
lent to 266 Mpc for Hubble constant Ho = 75 km/s/Mpc) for the first time.
This bulk flow is in even greater tension with the Standard Model\, having
less than 0.003% probability of occurring.\n\nhttps://indico.unina.it/eve
nt/70/contributions/954/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/954/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Observational cosmology with weak gravitational lensing
DTSTART;VALUE=DATE-TIME:20230531T084000Z
DTEND;VALUE=DATE-TIME:20230531T092000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-953@cern.ch
DESCRIPTION:Speakers: Marika ASGARI ()\nI give a review of weak gravitatio
nal lensing by the large scale structures also known as cosmic shear. I wi
ll take you through the steps taken to extract cosmological information fr
om data and discuss the results from the recent weak gravitational lensing
surveys. I will then discuss the tension in the structure growth paramete
r when comparing the weak lensing results with the cosmic microwave backgr
ound and their implications.\n\nhttps://indico.unina.it/event/70/contribut
ions/953/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/953/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome
DTSTART;VALUE=DATE-TIME:20230530T083000Z
DTEND;VALUE=DATE-TIME:20230530T084000Z
DTSTAMP;VALUE=DATE-TIME:20240528T010207Z
UID:indico-contribution-70-951@cern.ch
DESCRIPTION:Speakers: Jackson Levi Said ()\nhttps://indico.unina.it/event/
70/contributions/951/
LOCATION:Lisbon
URL:https://indico.unina.it/event/70/contributions/951/
END:VEVENT
END:VCALENDAR