  We explore the effects of different boundary conditions and coupling schemes
on the response of a particle detector undergoing uniform acceleration in
optical cavities. We analyze the thermalization properties of the accelerated
detector via non-perturbative calculations. We prove non-perturbatively that if
the switching process is smooth enough, the detector thermalizes to the Unruh
temperature regardless of the boundary conditions and the form of the coupling
considered.

Quantum Physics;General Relativity and Quantum Cosmology