In this paper, we will examine the problem of violation of causality in f (R, T ) modified gravity, where R is the Ricci scalar and T is the trace of the energy-momentum tensor T µν . We investigate the causality problem in two special cases, in the first we consider the matter content of the universe as a perfect fluid and in the second case, the matter content is a perfect fluid plus a scalar field.

In this paper, we will examine the problem of violation of causality in f (R, T ) modified gravity, where R is the Ricci scalar and T is the trace of the energy-momentum tensor T µν . We investigate the causality problem in two special cases, in the first we consider the matter content of the universe as a perfect fluid and in the second case, the matter content is a perfect fluid plus a scalar field.