What is black hole thermodynamics?
Classical Black Hole Thermodynamics From the forgoing it is apparent that energy can °ow not just into black holes but also out of them, and they can act as an intermediary in energy exchange processes.
What temperature does a black hole need to dissipate?
However, since the universe contains the cosmic microwave background radiation, in order for the black hole to dissipate, the black hole must have a temperature greater than that of the present-day blackbody radiation of the universe of 2.7 K.
What is the critical density of a black hole?
†primordial black hole (hypothetical): e.g.Rs(1015gm)»10¡13cm. (Hawking temperature»10 MeV; would ?nish evaporating today if born in early universe.) SinceMgrows liker3at ?xed density, one can have a black hole at any density. For a solar mass the critical density is a little above nuclear density.
What is the energy conservation of a black hole?
Since a black hole radiates energy by Hakwing radiation, energy conservation implies that it will lose mass. The rate of mass loss is about one Hawking quantumM¡1perR s=M(in Planck units „h=c=G= 1). That is,dM=dt » ¡M¡2. Another way to see this is to use Stefan’s law. The e?ective black hole area is R2 s» M2, whileT4 H» M
Some Simple Black Hole Thermodynamics