科研之友
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摘要
In this paper, we revisit the issue of static hairs of black holes in gravitational theories with broken Lorentz invariance in the case that the speed c(phi) of the khronon field becomes infinitely large, c(phi) = infinity, for which the sound horizon of the khronon field coincides with the universal horizon, and the boundary conditions at the sound horizon reduce to those given normally at the universal horizons. As a result, fewer boundary conditions are present in this extreme case in comparison with the case c(phi) = finite. Consequently, it is expected that static hairs might exist. However, we show analytically that, even in this case, static hairs still cannot exist, based on a decoupling limit analysis. We also consider the cases in which c(phi) is finite but with c(phi) >> 1, and we obtain the same conclusion.
- 出版日期2017-6-28
- 单位浙江工业大学
