含有额外标量的DHOST理论中的超光现象
Superluminality in DHOST theory with extra scalar
摘要：
我们考虑DHOST Ia理论与一个最小耦合到引力的附加常规标量场的引力相互作用。在线性化的宇宙学背景扰动下，我们发现在缓慢滚动的额外标量场存在下，其中一种模式一般以超光速传播。这个结果对任何稳定的宇宙学背景都是有效的。我们确定了一个子类的DHOST Ia理论中，这种superluminality属性是不存在的，所有的模式可以传播（分）发光。我们讨论了相互作用的DHOST Ia理论的可能影响。
英文摘要：
We consider DHOST Ia theory interacting gravitationally with an additional conventional scalar field minimally coupled to gravity. At the linearized level of perturbations about cosmological background, we find that in the presence of a slowly rolling extra scalar field, one of the modes generically propagates at superluminal speed. This result is valid for any stable cosmological background. We identify a subclass of DHOST Ia theories in which this superluminality property is absent, and all modes may propagate (sub)luminally. We discuss possible implications for the interacting DHOST Ia theories.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
