Abstract
An observer-dependent Hamiltonian is introduced in order to describe massless spin-1 particles in curved space-times. The vacuum state is defined by means of Hamiltonian diagonalization and minimization, which turns out to be equivalent criteria. This method works in an arbitrary geometry, although a condition on the fluid of observers is required. Computations give the vacua commonly accepted in the literature.
- Received 12 May 1987
DOI:https://doi.org/10.1103/PhysRevD.40.1876
©1989 American Physical Society