Quantum vacuum definition for spin-(1/2) fields in Robertson-Walker metrics

Journal Article · Mon Dec 15 00:00:00 EST 1986 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.34.3689· OSTI ID:6700435

Chimento, L P; Mollerach, M S

We study the quantum vacuum definition for spin-(1/2) fields in a Robertson-Walker universe using the coincidence of a local property (singularity structure of the DeWitt-Schwinger kernel) and a global property (energy minimization) and we obtain two kinds of vacua: strong and weak (which coincide with the energy minimization vacuum). The density of particles created during the expansion of the Universe between two weak vacua is found to be finite. However, we prove that the energy-momentum tensor vacuum expectation value is nonrenormalizable.

• Research Organization: Departamento de Fisica, F.C.E. y N. Universidad de Buenos Aires, Pab. I, 1428, Buenos Aires, Argentina
• OSTI ID: 6700435
• Journal Information: Phys. Rev. D; (United States), Vol. 34:12
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM FIELD THEORY
VACUUM STATES
UNIVERSE
DIRAC EQUATION
ENERGY-MOMENTUM TENSOR
LAGRANGIAN FUNCTION
METRICS
RENORMALIZATION
SPACE-TIME
SPIN
VECTOR FIELDS
ANGULAR MOMENTUM
DIFFERENTIAL EQUATIONS
EQUATIONS
FIELD THEORIES
FUNCTIONS
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE PROPERTIES
TENSORS
WAVE EQUATIONS
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