Gauge Theories for gravitation: foundations and cosmological applications
Black holes in an expanding universe and interaction betweend dark matter and dark...
| Full text | |
| Author(s): |
Lin, Kai
;
Mukohyama, Shinji
;
Wang, Anzhong
;
Zhu, Tao
Total Authors: 4
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW D; v. 95, n. 12, p. 18-pg., 2017-06-28. |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 12/08934-0 - Horava's gravity at Lifshitz fixed points and its applications to cosmology and astrophysics |
| Grantee: | Kai Lin |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |