Energy-momentum tensor renormalization for vector fields in Robertson-Walker backgrounds

Journal Article · Tue May 15 04:00:00 EDT 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.41.3101· OSTI ID:6940365

Chimento, L P; Cossarini, A E ^[1]

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1. Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires Pabellon I, 1428 Buenos Aires, Argentina (AR)

In this paper we generalize the Stueckelberg formalism of flat spacetime to describe vector fields propagating in a Robertson-Walker spatially flat background. In the zero-mass limit of the regularized energy-momentum tensor we recover the usual vacuum-polarization terms of the massless Maxwell theory. Further on we investigate particle creation and the renormalizability of the energy-momentum tensor expectation value in the vacuum state which minimizes the metric Hamiltonian. In the massive case we found that the last one corresponds to that obtained through the Higgs mechanism and that it is not renormalizable in general. In the massless case we found that both quantities are finite and are in agreement with those in the literature obtained by different regularization methods, the resulting vacuum being the standard conformal one.

• OSTI ID: 6940365
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 41:10; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ENERGY-MOMENTUM TENSOR
FIELD THEORIES
HAMILTONIANS
HIGGS MODEL
HUBBLE EFFECT
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
METRICS
PARTICLE MODELS
PARTICLE PRODUCTION
QUANTUM FIELD THEORY
QUANTUM OPERATORS
RENORMALIZATION
SPACE-TIME
TENSORS
VACUUM POLARIZATION
VACUUM STATES
VECTOR FIELDS