New definition of complexity factor in f(R, T, RμνTμν) gravity

This paper is devoted to present new definition of complexity factor for static cylindrically symmetric matter configurations in f(R, T, R mu nu T mu nu) gravity. For this purpose, we have considered irrotational static cylindrical spacetime coupled with a locally anisotropic relativistic fluid. After formulating gravitational field and conservation equations, we have performed orthogonal splitting of the Riemann curvature tensor. Unlike GR (for spherical case) the one of the structure scalars X-TF, has been identified to be a complexity factor. This factor contains effective forms of the energy density, and anisotropic pressure components. Few peculiar relations among complexity factor, Tolman mass and Weyl scalar are also analyzed with the modified f(R, T, R mu nu T mu nu) corrections. (C) 2020 Elsevier B.V. All rights reserved.