@Article{Barrientos_etal2018,
author="Barrientos, E.
and Lobo, F. S. N.
and Mendoza, S.
and Olmo, G. J.
and Rubiera-Garcia, D.",
title="Metric-affine f(R,T) theories of gravity and their applications",
journal="Physical Review D",
year="2018",
publisher="Amer Physical Soc",
volume="97",
number="10",
pages="104041--10pp",
abstract="We study f (R, T) theories of gravity, where T is the trace of the energy-momentum tensor T-mu v, with independent metric and affine connection (metric-affine theories). We find that the resulting field equations share a close resemblance with their metric-affine f(R) relatives once an effective energy-momentum tensor is introduced. As a result, the metric field equations are second-order and no new propagating degrees of freedom arise as compared to GR, which contrasts with the metric formulation of these theories, where a dynamical scalar degree of freedom is present. Analogously to its metric counterpart, the field equations impose the nonconservation of the energy-momentum tensor, which implies nongeodesic motion arid consequently leads to the appearance of an extra force. The weak field limit leads to a modified Poisson equation formally identical to that found in Eddington-inspired Born-Infeld gravity. Furthermore, the coupling of these gravity theories to perfect fluids, electromagnetic, and scalar fields, and their potential applications arc discussed.",
optnote="WOS:000433036500004",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3585), last updated on Wed, 06 Jun 2018 17:26:34 +0000",
issn="2470-0010",
doi="10.1103/PhysRevD.97.104041",
opturl="http://arxiv.org/abs/1803.05525",
opturl="https://doi.org/10.1103/PhysRevD.97.104041",
archivePrefix="arXiv",
eprint="1803.05525",
language="English"
}