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Paper   IPM / P / 12765
School of Physics
  Title:   Radiation from the Dust LTB Black Hole
1.  J. Taghizadeh Firouzjaee
2.  R. Mansouri
  Status:   Published
  Journal: Europhys. Lett.
  Vol.:  97
  Year:  2012
  Pages:   29002
  Supported by:  IPM
Does a dynamical black hole embedded in a cosmological FRW background emit the Hawking radiation where a globally defined event horizon does not exist? What are the differences to the Schwarzschild black hole? What about the first law of black hole mechanics? We face these questions using the LTB cosmological black hole model recently published. Using the Hamilton-Jacobi- and radial null geodesic- methods suitable for dynamical cases, we show that it is the apparent horizon which contributes to the Hawking radiation and not the event horizon. The Hawking temperature is calculated using the two different methods giving the same result. The first law of LTB black hole dynamics and the thermal character of the radiation is also dealt with.

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