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SUMMARY:Reconstructions of ƒ (R\, G) and ƒ (R) scenarios at small redshi
 fts through kinematics
DTSTART:20181217T090000Z
DTEND:20181217T100000Z
DTSTAMP:20260519T001700Z
UID:indico-event-17378@agenda.infn.it
DESCRIPTION:Speakers: Marco Calzà (University of Trento)\n\n\n    In the 
 last few decades\, extensions of General Relativity have reached always mo
 re attention especially in view of possible breakdowns of the standard ΛC
 DM paradigm at intermediate and high redshift regimes. If General Relativi
 ty would not be the ultimate theory of gravity\, modifying Einstein’s gr
 avity in the homogeneous and isotropic universe may likely represent a via
 ble path toward the description of current universe speed up.\n    \n    W
 e here focus our attention on two classes of extended theories\, i.e. the 
 f (R) and f (R\, G) paradigms\, with the only requirement that the cosmolo
 gical principle holds. We thus limit our treatment by only assuming the co
 ncordance paradigm is pre-served at background cosmology. In so doing\, we
  presume that each extended models reduce to the ΛCDM scenario at infrare
 d energy regime. To do so\, we involve a few classes of F (R\, G) = R + f 
 (R\, G) modified theories of gravity\, i.e in which the Ricci scalar is ex
 plicitly reported. Hence\, we parameterize the so-obtained Hubble rate by 
 means of effective barotropic fluids\, by calibrating the shapes of our cu
 rves through the most suitable dark energy parameterizations\, e.g. XCDM\,
  CPL\, WP\, and so forth. Afterwards\, by virtue of the correspondence bet
 ween Ricci and Gauss-Bonnet invariants and the redshift z\, i.e. R = R(z) 
 and G = G(z)\, we rewrite f(R\,G) in terms of corresponding f(z) auxiliary
  functions. This scheme enables one to get numerical shapes for f(R\,G) an
 d f(R) models. Further\, we fixed our priors over the free coefficients of
  our frameworks by means of the most recent outcomes provided by Planck’
 s mission. \n\n     \n\nhttps://agenda.infn.it/event/17378/
LOCATION:Hans Bethe Meeting Room (TIFPA)
URL:https://agenda.infn.it/event/17378/
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