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SUMMARY:Cosmological implications of Weyl geometric gravity
DTSTART;VALUE=DATE-TIME:20230601T130000Z
DTEND;VALUE=DATE-TIME:20230601T132500Z
DTSTAMP;VALUE=DATE-TIME:20240810T171745Z
UID:indico-contribution-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/
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