The Hawking effect is induced by the causal horizon of a black hole, which separates the interior and exterior modes such that asymptotic observers at infinity see thermal radiation flux. What can we say about the physics of interior modes? Can we think of them as interior Hawking radiation at some temperature? Do any observers behind the horizon see thermal radiation?
Note that I'm not asking about a quantum gravity question, but rather just a QFT-on-curved-spacetime question. (Any relevant references would be useful.)
