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Paper   IPM / Physic / 14298
School of Physics
  Title:   Black Hole Entropy from Entropy of Hawking Radiation
1.  S. Aghapour
2.  K. Hajian
  Status:   Published
  Journal: J.Mod.Phys.
  Vol.:  7
  Year:  2016
  Pages:   2063-2070
  Supported by:  IPM
We provide a simple way for calculating the entropy of a Schwarzschild black hole from the entropy of its Hawking radiation. To this end, we show that if a thermodynamic system loses its energy only through the black body radiation, its loss of entropy is always 3/4 of the entropy of the emitted radiation. This proposition enables us to relate the entropy of an evaporating black hole to the entropy of its Hawking radiation. Explicitly, by calculating the entropy of the Hawking radiation emitted in the full period of evaporation of the black hole, we find the Bekenstein-Hawking entropy of the initial black hole.

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