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Paper   IPM / Physic / 8337
School of Physics
  Title:   Double-Horizon Limit and Decoupling of the Dynamics at the Horizon
  Author(s): 
1.  H. Arfaei
2.  R. Fareghbal
  Status:   Published
  Journal: JHEP
  Vol.:  1
  Year:  2007
  Pages:   060
  Supported by:  IPM
  Abstract:
We show that the attractor mechanism for generic black hole is a consequence of double-horizon. Investigation of equations of motion shows that in the case of double-horizon black holes, the dynamics of geometry, scalars and gauge fields at the horizon decouples from the rest of the space. In the general case, the value of the fields at the horizon satisfies a number of differential equations of functions of the θ coordinate. We show this for the case of rotating and non-rotating electrically charged black holes in the general two derivative theories of gravity and f(R) gravities and theories with cosmological constant.

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