PT Journal
AU Marañon-Gonzalez, FJ
   Navarro-Salas, J
TI Adiabatic regularization for spin-1 fields
SO Physical Review D
JI Phys. Rev. D
PY 2023
BP 125001 - 11pp
VL 108
IS 12
DI 10.1103/PhysRevD.108.125001
LA English
AB We analyze the adiabatic regularization scheme to renormalize Proca fields in a four-dimensional Friedmann-Lemaitre-Robertson-Walker spacetime. The adiabatic method is well established for scalar and spin-1/2 fields, but is not yet fully understood for spin-1 fields. We give the details of the construction and show that, in the massless limit, the renormalized stress-energy tensor of the Proca field is closely related to that of a minimally coupled scalar field. Our result is in full agreement with other approaches, based on the effective action, which also show a discontinuity in the massless limit. The scalar field can be naturally regarded as a Stueckelberg-type field. We also test the consistency of our results in de Sitter space.
ER