Response to Comment on "Reexamining f(R,T)f(R,T) Gravity''

preprint2020arXivOpen access

Abstract

Harko and Moraes claim that in f(R,T)f(R,T) gravity with f(R,T)=f1(R)+f2(T)f(R,T)=f_1(R)+f_2(T), the term f2(T)f_2(T) cannot be incorporated in the matter Lagrangian Lm{\cal L}_m. A careful examination of their Comment finds that they have made several dubious assumptions without indicating any errors in our work. Most notably, they have unjustifiably claimed that the two terms Lm{\cal L}_m and f2(T)f_2(T) are of ``different origin,'' and their inference that only the first contributes to the energy momentum tensor is arbitrary. Also significant, their derivation of equations of motion from a Lagrangian formulation, imposing conservation constraints {\it ad hoc} rather than via Lagrange multipliers, leads to inconsistent conclusions.

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