Particle production in inhomogeneous cosmologies

Journal Article · Thu Feb 15 04:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.41.1022· OSTI ID:6997180

Cespedes, J; Verdaguer, E ^[1]

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1. Grup de Fisica Teorica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona, Spain (ES)

A perturbative evaluation of the {ital S} matrix is used to compute the production of particles in an expanding flat Friedmann-Robertson-Walker universe in the presence of small inhomogeneities. We first consider the production of massless conformally coupled and weakly nonconformally coupled particles, obtaining known results, and then we consider the production of massive particles. The production of massive particles cannot be treated only perturbatively and a method is proposed to compute this in general. The pair-production probability is computed using two different, but related, methods: in one we directly evaluate the number of particles produced and in the other we concentrate mainly on the vacuum-to-vacuum or vacuum persistence amplitude.

• OSTI ID: 6997180
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 41:4; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMOLOGICAL MODELS
DIFFERENTIAL EQUATIONS
EQUATIONS
FIELD THEORIES
GALAXIES
KLEIN-GORDON EQUATION
MATHEMATICAL MODELS
MATRICES
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE PRODUCTION
PERTURBATION THEORY
PROBABILITY
QUANTUM FIELD THEORY
S MATRIX
SCALAR FIELDS
SPACE-TIME
UNIVERSE
VACUUM STATES
WAVE EQUATIONS