
Physics 2011
Hawking radiation, Unruh radiation and the equivalence principleDOI: 10.1103/PhysRevLett.107.081102 Abstract: We compare the response function of an UnruhDeWitt detector for different spacetimes and different vacua and show that there is a {\it detailed} violation of the equivalence principle. In particular comparing the response of an accelerating detector to a detector at rest in a Schwarzschild spacetime we find that both detectors register thermal radiation, but for a given, equivalent acceleration the fixed detector in the Schwarzschild spacetime measures a higher temperature. This allows one to locally distinguish the two cases. As one approaches the horizon the two temperatures have the same limit so that the equivalence principle is restored at the horizon.
