Published December 19, 1985
| Version v1
Journal article
Entropy production in an expanding universe
Description
We consider an interacting scalar field in a time-dependent background and estimate dissipative effects due to particle production and/or interactions of the field with a heat bath using techniques of thermo field dynamics. Assuming the system is in near-thermal equilibrium, a general expression for the source of friction is presented. Applying the result to an expanding universe, the effective equation of motion for the classical background is obtained and implications are discussed. (orig.)
Additional details
Publishing Information
- Journal Title
- Phys. Lett., B
- Journal Volume
- 165
- Journal Issue
- 1-3
- Series
- Phys. Lett., B.
- Journal Page Range
- 59-62
- ISSN
- 0370-2693
- CODEN
- PYLBA
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- Netherlands
- INIS RN
- 17023766
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- COSMOLOGY; DISSIPATION FACTOR; ENTROPY; EQUATIONS OF MOTION; EXPANSION; FIELD EQUATIONS; FRICTION; IRREVERSIBLE PROCESSES; LAGRANGE EQUATIONS; LAGRANGIAN FIELD THEORY; PARTICLE PRODUCTION; SCALAR FIELDS; SELF-ENERGY; SPECTRAL DENSITY; THERMAL EQUILIBRIUM; THERMODYNAMICS; TIME DEPENDENCE; UNIVERSE
- Descriptors DEC
- DIFFERENTIAL EQUATIONS; ENERGY; EQUATIONS; EQUILIBRIUM; FIELD THEORIES; FUNCTIONS; PARTIAL DIFFERENTIAL EQUATIONS; PHYSICAL PROPERTIES; QUANTUM FIELD THEORY; SPECTRAL FUNCTIONS; THERMODYNAMIC PROPERTIES