The present universe in the Einstein frame, metric-affine R+1/R gravity

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dc.creatorPoplawski, Nikodem J.
dc.date2005-11-14
dc.date2006-07-07
dc.date.accessioned2026-07-07T06:49:42Z
dc.date.available2026-07-07T06:49:42Z
dc.descriptionWe study the present, flat isotropic universe in 1/R-modified gravity. We use the Palatini (metric-affine) variational principle and the Einstein (metric-compatible connected) conformal frame. We show that the energy density scaling deviates from the usual scaling for nonrelativistic matter, and the largest deviation occurs in the present epoch. We find that the current deceleration parameter derived from the apparent matter density parameter is consistent with observations. There is also a small overlap between the predicted and observed values for the redshift derivative of the deceleration parameter. The predicted redshift of the deceleration-to-acceleration transition agrees with that in the Λ-CDM model but it is larger than the value estimated from SNIa observations.
dc.description11 pages; published version
dc.identifierhttps://arxiv.org/abs/gr-qc/0511071
dc.identifierhttp://arxiv.org/abs/gr-qc/0511071
dc.identifierClass.Quant.Grav. 23 (2006) 4819-4828
dc.identifierdoi:10.1088/0264-9381/23/15/003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/104447
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleThe present universe in the Einstein frame, metric-affine R+1/R gravity
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