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arXiv · 2011.08005

A study on causality in $f(R,ϕ,X)$ theory

J. S. Gonçalves·A. F. Santos
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Abstract

The $k$-essence modified $f(R)$ gravity model, i.e., $f(R,ϕ,X)$ theory is studied. The question of violation of causality, in the framework of Gödel-type universes, is investigated in this gravitational model. Causal and non-causal solutions are allowed. A critical radius for non-causal solution is calculated. It is shown that the violation of causality depends on the content of matter.

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J. S. Gonçalves, A. F. Santos. 2020-11-16. A study on causality in $f(R,ϕ,X)$ theory. https://doi.org/10.1142/s0217751x21500093

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