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Journal Article

Fluctuating Black Hole Horizons


Mei,  Jianwei
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Mei, J. (2013). Fluctuating Black Hole Horizons. Journal of high energy physics: JHEP, 2013(10): 195. doi:10.1007/JHEP10(2013)195.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-75FC-E
In this paper we treat the black hole horizon as a physical boundary to the spacetime and study its dynamics following from the Gibbons-Hawking-York boundary term. Using the Kerr black hole as an example we derive an effective action that describes, in the large wave number limit, a massless Klein-Gordon field living on the average location of the boundary. Complete solutions can be found in the small rotation limit of the black hole. The formulation suggests that the boundary can be treated in the same way as any other matter contributions. In particular, the angular momentum of the boundary matches exactly with that of the black hole, suggesting an interesting possibility that all charges (including the entropy) of the black hole are carried by the boundary. Using this as input, we derive predictions on the Planck scale properties of the boundary.