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Paper   IPM / Physic / 7278
School of Physics
  Title:   Near Extremal Schwarzschild-de Sitter Black Hole Area Spectrum from Quasi-Normal Modes
  Author(s):  M.R. Setare
  Status:   Published
  Journal: Gen. Relat. Gravit.
  Vol.:  37
  Year:  2005
  Pages:   1411-1417
  Supported by:  IPM
  Abstract:
Using the quasi-normal modes frequency of near extremal Schwarzschild-de Sitter black holes, we obtain area and entropy spectrum for black hole horizon. By using Boher-Sommerfeld quantization for an adiabatic invariant I=∫[(dE)/(ω(E))], which E is the energy of system and ω(E) is vibrational frequency, we leads to an equally spaced mass spectrum. In the other term we extend directly the Kunstatter's approach [7] to determine mass and entropy spectrum of near extremal Schwarzschild-de Sitter black holes which is asymptotically de Sitter rather than asymptotically flat.

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