Scalar field in the early Universe: Coherent-state representation and thermal density matrix

Details Scalar field in the early Universe: Coherent-state representation and thermal density matrix Scalar field in the early Universe: Coherent-state representation and thermal density matrix

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981phrvd..23.1250b&link_type=abstract

Physical Review D (Particles and Fields), Volume 23, Issue 6, 15 March 1981, pp.1250-1257

Physics

18

Scientific paper

A coherent-state representation valid even near the singularity is constructed for each mode of a quantized scalar field in a classical spatially homogeneous anisotropic background cosmology. The stress-energy tensor expectation values are computed in a coherent state and shown to be classical except for zero-point-energy terms. The self-consistent problem of a quantized scalar field in a changing background metric is discussed. The scalar field can also be described by a density matrix rather than a pure state. The density matrix is then used to determine expectation values. The density matrix need not be a thermal distribution although such a choice is reasonable in a realistic model. Temperature estimates are made using dimensional analysis.

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