期刊
PHYSICAL REVIEW D
卷 97, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.97.104041
关键词
-
资金
- CONACyT [517586, 26344, PAPIIT IN112616, CB-2014-1, 240512]
- DGAPA-UNAM
- Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) [IF/00859/2012]
- Ramon y Cajal (Spain) [RYC-2013-13019]
- FCT [SFRH/BPD/102958/2014]
- MINECO/FEDER, EU [FIS2014-57387-C3-1-P]
- H2020-MSCA-RISE [FunFiCO-777740]
- Generalitat Valenciana [SEJI/2017/042]
- COST (European Cooperation in Science and Technology) [CA15117]
- [UID/FIS/04434/2013]
- [PEst-OE/FIS/UI2751/2014]
- [CPANPHY-1205388]
- [SEV-2014-0398]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据