PIRSA:13110087 Scientific Series Strong Gravity

DOI10.48660/13110087

Series: Strong Gravity

Saravani, M. (2013). Dynamical Emergence of Universal Horizons during the formation of Black Holes . Perimeter Institute. https://pirsa.org/13110087

Saravani, Mehdi. Dynamical Emergence of Universal Horizons during the formation of Black Holes . Perimeter Institute, Nov. 07, 2013, https://pirsa.org/13110087 

@misc{ pirsa_PIRSA:13110087,
  doi = {10.48660/13110087},
  url = {https://pirsa.org/13110087},
  author = {Saravani, Mehdi},
  keywords = {Strong Gravity},
  language = {en},
  title = {Dynamical Emergence of Universal Horizons during the formation of Black Holes },
  publisher = {Perimeter Institute},
  year = {2013},
  month = {nov},
  note = {PIRSA:13110087 see, \url{https://pirsa.org}}
}

Abstract

In many theories with fundamental preferred frame, such as Einstein-Aether or Gravitational Aether theories, K-essence, Cuscuton theory, Shape Dynamics, or (non-projectable) Horava-Lifshitz gravity, the low energy theory contains a fluid with superluminal or incompressible excitations. In this talk, I study the formation of black holes in the presence of such a fluid. In particular, I focus on the incompressible limit of the fluid (or Constant Mean Curvature foliation) in the space-time of a spherically collapsing shell within an asymptotically cosmological space-time. In this case, I show that an observer inside 3/4 of the Schwarzschild radius cannot send a signal outside, after a stage in collapse, even using signals that propagate infinitely fast in the preferred frame. This confirms the dynamical emergence of universal horizons that have been previously found in static solutions [arXiv:1110.2195, arXiv:1104.2889, arXiv:1212.1334].

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