Cosmology from a new non-conservative gravity
Abstract
In this paper we present a cosmological model arising from a non-conservative gravitational theory proposed in [PRD 95, 101501(R) (2017)]. The novel feature where comparing with previous implementations of dissipative effects in gravity is the possible arising of such phenomena from a least action principle, so they are of a purely geometric nature. We derive the dynamical equations describing the behaviour of the cosmic background, considering a single fluid model composed by pressureles matter, whereas the dark energy is conceived as an outcome of the "geometric" dissipative process emerging in the model. Besides, adopting the synchronous gauge we obtain the first-order perturbative equations which shall describe the evolution of the matter perturbations within the linear regime.
Cite
@article{arxiv.1711.06206,
title = {Cosmology from a new non-conservative gravity},
author = {Júlio C. Fabris and Hermano Velten and Thiago R. P. Caramês and Matheus J. Lazo and Gastão S. F. Frederico},
journal= {arXiv preprint arXiv:1711.06206},
year = {2018}
}
Comments
8 pages, 2 figures; version enriched with more discussion, graphs were improved and new references added. To appear in IJMPD