Black holes in Lorentz violating gravity, such as Einstein-Aether or Hořava-Lifshitz gravity, are drastically different from their general relativistic siblings. Although they allow for superluminal motion in their vicinity, they still exhibit an absolute causal boundary in the form of a universal horizon. By working in the tunneling picture for a gravitating scalar field, we show that universal horizons emit Hawking radiation in a manner akin to standard results in general relativity, with a temperature controlled by the high-energy behavior of the dispersion relation of the gravitating field, and in agreement with alternative derivations in the literature. Our results substantiate the link between the universal horizon and thermodynamics in Lorentz violating theories.

中文翻译：

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违反重力的洛伦兹引力隧穿

洛伦兹中违反引力的黑洞，如爱因斯坦-以太或霍拉瓦-利夫希茨引力，与它们的广义相对论兄弟黑洞截然不同。尽管它们允许在其附近进行超光速运动，但它们仍然表现出以宇宙视界形式存在的绝对因果边界。通过研究引力标量场的隧道效应，我们证明了宇宙视界以类似于广义相对论标准结果的方式发射霍金辐射，其温度由引力场色散关系的高能行为控制，并与文献中的替代推导一致。我们的结果证实了宇宙视界与洛伦兹违反理论中的热力学之间的联系。