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SUMMARY:Gamma-Ray Burst cosmology and future perspectives
DTSTART;VALUE=DATE-TIME:20230531T104000Z
DTEND;VALUE=DATE-TIME:20230531T110500Z
DTSTAMP;VALUE=DATE-TIME:20260809T132155Z
UID:indico-contribution-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/
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