论文标题
$ f（r，ϕ，x）$理论的因果关系的研究
A study on causality in $f(R,ϕ,X)$ theory
论文作者
论文摘要
研究了$ k $ - 修改$ f（r）$重力模型，即$ f（r，ϕ，x）$理论。在这种引力模型中，研究了在戈德尔型宇宙框架中违反因果关系的问题。允许因果解决方案。计算非毒物溶液的临界半径。结果表明，侵犯因果关系取决于物质的内容。
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.
