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Particle creation and entropy generation in time-dependent quantum fields

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  • Kandrup, Henry E.

Abstract

Recently, this author has proposed a measure of nonequilibrium entropySN for a quantum field in a dynamical spacetime which, motivated by the Uncertainty Principle, reflects in a natural way the average particle number〈N〉 and the dispersion ΔN. Superficially, this SN appears very different from the “correlational” entropy S1 introduced by Hu and Kandrup. However, it is shown here that both S1 and SN can be viewed in much the same sense as reflecting a “coarse-graining” of the full density matrix, so that they are in fact quite similar objects. This formal similarity sheds light on the special role of “random phase” initial data, which lead to subsequent increases in 〈N〉, ΔN, andSN.

Suggested Citation

  • Kandrup, Henry E., 1989. "Particle creation and entropy generation in time-dependent quantum fields," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 158(1), pages 336-342.
    • Handle: RePEc:eee:phsmap:v:158:y:1989:i:1:p:336-342
    DOI: 10.1016/0378-4371(89)90533-5
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