Revisiting the cuscuton as a Lorentz-violating gravity theory
Revisiting the cuscuton as a Lorentz-violating gravity theory
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重新审视 cuscuton 作为洛伦兹违反引力理论
DOI：
10.1103/physrevd.97.064020
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发表时间：
2016
影响因子：
5
通讯作者：
T. Sotiriou
中科院分区：
文献类型：
--
作者：
Jishnu Bhattacharyya;A. Coates;M. Colombo;A. Gumrukcuoglu;T. Sotiriou
cuscuton 是一个传播速度无限的标量场。它是在宇宙学背景下引入的，但也有人声称它在一定程度上类似于霍拉瓦引力。在这里，我们将 cuscuton 理论重新审视为洛伦兹破坏引力理论。我们阐明了它与霍拉瓦引力和爱因斯坦以太理论的关系，分析了它的因果结构，并考虑了它的初值公式。最后，我们讨论了在引力坍缩和宇宙视界形成的背景下，在多大程度上可以使用 cuscuton 理论来代替 Horava 引力。
The cuscuton is a scalar field with infinite speed of propagation. It was introduced in the context of cosmology but it has also been claimed to resemble Horava gravity in a certain limit. Here we revisit the cuscuton theory as a Lorentz-violating gravity theory. We clarify its relation with Horava gravity and Einstein-aether theory, analyze its causal structure, and consider its initial value formulation. Finally, we discuss to which extent the cuscuton theory can be used as a proxy for Horava gravity in the context of gravitational collapse and formation of universal horizons.