- #36
Mordred
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Obviously, the Hawking radiation with a temperature which is proportional to its surface gravity on the event horizoncan give some insight on the deep relationship between gravity and thermodynamics. Indeed, the thermodynamics of black hole has already been constructed with the Bekenstein entropy of a black hole [3–6]. Note that, the Hawking radiation is usually investigated from the eventhorizon of a stationary black hole. In fact, it can also be obtained from the cosmological horizon of a spacetime such as the cosmological horizon of de Sitter spacetime.
Therefore, Hawking radiation may also exist in a FRW universe. By considering that the FRW universe is also a spherical symmetric spacetime and with an apparent horizon, therefore, the above discussion on the apparent horizon of dynamic spherical symmetric black hole spacetime can be generalized to the FRW universe.
the above is two quotes from the Hawking radiation in an FRW universe. The paper later shows the tunnelling via the cosmological horizon.
Therefore, Hawking radiation may also exist in a FRW universe. By considering that the FRW universe is also a spherical symmetric spacetime and with an apparent horizon, therefore, the above discussion on the apparent horizon of dynamic spherical symmetric black hole spacetime can be generalized to the FRW universe.
the above is two quotes from the Hawking radiation in an FRW universe. The paper later shows the tunnelling via the cosmological horizon.