f(R) cosmology with torsion

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dc.creatorCapozziello, S.
dc.creatorCianci, R.
dc.creatorStornaiolo, C.
dc.creatorVignolo, S.
dc.date2008-10-14
dc.date.accessioned2026-07-07T12:31:50Z
dc.date.available2026-07-07T12:31:50Z
dc.descriptionf(R)-gravity with geometric torsion (not related to any spin fluid) is considered in a cosmological context. We derive the field equations in vacuum and in presence of perfect-fluid matter and discuss the related cosmological models. Torsion vanishes in vacuum for almost all arbitrary functions f(R) leading to standard General Relativity. Only for f(R)=R^{2}, torsion gives contribution in the vacuum leading to an accelerated behavior . When material sources are considered, we find that the torsion tensor is different from zero even with spinless material sources. This tensor is related to the logarithmic derivative of f'(R), which can be expressed also as a nonlinear function of the trace of the matter energy-momentum tensor. We show that the resulting equations for the metric can always be arranged to yield effective Einstein equations. When the homogeneous and isotropic cosmological models are considered, terms originated by torsion can lead to accelerated expansion. This means that, in f(R) gravity, torsion can be a geometric source for acceleration.
dc.description13 pages
dc.identifierhttps://arxiv.org/abs/0810.2549
dc.identifierhttp://arxiv.org/abs/0810.2549
dc.identifierPhys.Scripta 78:065010,2008
dc.identifierdoi:10.1088/0031-8949/78/06/065010
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216585
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titlef(R) cosmology with torsion
dc.typetext

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