Comment on "Reexamining f (R, T) gravity"

Autor(es)

Harko, Tiberiu ; Moraes, Pedro H. R. S.

• Tipo de documento: Artigo Científico
• Fonte: Physical Review D; v. 101, n. 10, p. 4-pg., 2020-05-28.

Resumo

In a recent paper, "Reexamining f(R, T) gravity", by S. B. Fisher and E. D. Carlson [Phys. Rev. D 100, 064059 (2019), the authors claim that for the particular f(R, T) modified gravity model, with f(R, T) = f(1) (R) + f(2) (T), the term f(2) (T) must be included in the matter Lagrangian and therefore it does not have any physical significance. We carefully reexamine the line of reasoning presented in the paper, and we show that there are several major conceptual problems related to the author's physical interpretations, as well as in the physical and mathematical approaches used to derive the energymomentum tensor of the theory. These problems raise some serious concerns about the validity of most of the results presented in the paper. (AU)

• Processo FAPESP: 15/08476-0 - Ondas gravitacionais em teorias f(R,T): estados de polarização e fontes astrofísicas
• Beneficiário: Pedro Henrique Ribeiro da Silva Moraes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
• Beneficiário: Manuel Máximo Bastos Malheiro de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Temático