Full text  
Author(s): 
Total Authors: 3

Affiliation:  ^{[1]} ITA, Dept Fis, BR12228900 Sao Paulo  Brazil
^{[2]} Univ Estadual Paulista, UNESP, Dept Fis & Quim, BR12516410 Sao Paulo  Brazil
Total Affiliations: 2

Document type:  Journal article 
Source:  EUROPEAN PHYSICAL JOURNAL C; v. 78, n. 3 MAR 7 2018. 
Web of Science Citations:  11 
Abstract  
We present a new approach for the f (R, T) gravity formalism, by thoroughly exploring the extra terms of its effective energymomentum tensor Tmu nu(eff), which we name (T) over tilde (mu nu), so that Tmu nu(eff) = Tmu nu + (T) over tilde (mu nu), with Tmu nu. being the usual energymomentum tensor of matter. Purely from the Bianchi identities, we obtain the conservation of both parts of the effective energymomentum tensor, rather than the nonconservation of Tmu nu, originally occurring in the f (R, T) theories. In this way, the intriguing scenario of matter creation, which still lacks observational evidence, is evaded. One is left, then, with two sets of cosmological equations to be solved: the Friedmannlike equations along with the conservation of Tmu nu and along with the conservation of (T) over tilde (mu nu). We present a physical interpretation for the conservation of (T) over tilde (mu nu), which can be related to the presence of stiff matter in the universe. The cosmological consequences of this approach are presented and discussed as well as the benefits of evading the matter energymomentum tensor nonconservation. (AU)  
FAPESP's process:  15/084760  Gravitational waves in f(R,T) theories: polarization states and astrophysical sources 
Grantee:  Pedro Henrique Ribeiro da Silva Moraes 
Support type:  Scholarships in Brazil  PostDoctorate 