# Can there be temperature inside of a massive Black Hole?

Since it cannot radiate light and therefore neither heat, if any reactions which generate heat were to occur inside a Black Hole, that would seem to imply an infinitely high ever increasing temperature, or perhaps none whatsoever, that the intense radiation from the accretion discs and plasma jets is a necessary transformation of mass into a form which can cross the event horizon...
I have never seen any reference to the temperature of a singularity, or if such a thing could have one, is there any theory of what it might be?

• Black holes do radiate, see Hawking radiation. And the more matter they absorb, the colder they get. – AccidentalBismuthTransform Apr 30 '19 at 5:39

• @ElioFabri - In GR there is no real difference, since they are all handled by the stress-energy tensor $T_{ij}$ anyway. Maybe I should try to add something about how both timelike and null geodesics pass through the horizon, but I fear it might get rather technical. – Anders Sandberg Apr 30 '19 at 11:03