Abstract
Under the extended dynamical tortoise coordinate transformation, Damour-Ruffini method has been applied to calculate the charged particles’ Hawking radiation from the apparent horizon of a dynamical Kerr-Newman black hole. It is shown that Hawking radiation is still purely thermal black body spectrum. Moreover, the temperature of Hawking radiation is corresponding to the apparent horizon surface gravity and the first law of thermodynamics can also be constructed successfully on the apparent horizon in the dynamical Kerr-Newman black hole.
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Liu, XM., Cheng, SJ. & Liu, WB. General Tortoise Coordinate Transformation in a Dynamical Kerr-Newman Black Hole. Int J Theor Phys 51, 518–525 (2012). https://doi.org/10.1007/s10773-011-0930-8
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DOI: https://doi.org/10.1007/s10773-011-0930-8