Do we know the mass of a black hole? Mass of some cosmological black hole models |
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Authors: | J T Firouzjaee M Parsi Mood Reza Mansouri |
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Institution: | 1.Department of Physics,Sharif University of Technology,Tehran,Iran;2.School of Astronomy,Institute for Research in Fundamental Sciences (IPM),Tehran,Iran |
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Abstract: | Using a cosmological black hole model proposed recently, we have calculated the quasi-local mass of a collapsing structure
within a cosmological setting due to different definitions put forward in the last decades to see how similar or different
they are. It has been shown that the mass within the horizon follows the familiar Brown–York behavior. It increases, however,
outside the horizon again after a short decrease, in contrast to the Schwarzschild case. Further away, near the void, outside
the collapsed region, and where the density reaches the background minimum, all the mass definitions roughly coincide. They
differ, however, substantially far from it. Generically, we are faced with three different Brown–York mass maxima: near the
horizon, around the void between the overdensity region and the background, and another at cosmological distances corresponding
to the cosmological horizon. While the latter two maxima are always present, the horizon mass maxima is absent before the
onset of the central singularity. |
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