Observables in quantum field theory on a collapsing black hole background

Covariant quantities like the energy density and flux associated with a quantum field theory depend on the trajectory of the observer's motion. In a gravitational collapse scenario, they also depend on the details of the collapsing classical matter which determines the background spacetime. We explore the separation between the contribution associated entirely by the Schwarzschild metric exterior to the classical matter and the contribution that depends on details of how the matter collapsed. We also examine acceleration effects such as the temperature a detector experiences in light of this separation, and discuss the contribution of quantum scalar fields to the backreaction problem which is dominated near the apparent singularity by a collapse-independent contribution.