Causality and its violation in $f(R,{\mathcal{L}}_m,\ddot{I}•,g^{\hat{I}¼\hat{I}½}{\nabla }_{\hat{I}}¼\ddot{I}•{\nabla }_{\hat{I}}½\ddot{I}•)$ gravity

L. A. S. Evangelista, M. L. R. Silva, J. V. Moretti +1

A modified gravitational model whose action is given by an arbitrary function of the Ricci scalar, the matter Lagrangian density, a scalar field, and its kinetic term is investigat…