HEISENBERG-PICTURE APPROACH TO THE EVOLUTION OF THE SCALAR FIELDS IN AN EXPANDING UNIVERSE

Authors
CHO KH YI JY KIM SP LEE CH RYU JY
Citation
Kh. Cho et al., HEISENBERG-PICTURE APPROACH TO THE EVOLUTION OF THE SCALAR FIELDS IN AN EXPANDING UNIVERSE, Physical review. D. Particles and fields, 56(8), 1997, pp. 4916-4921
Citations number
14
Categorie Soggetti
Physics, Particles & Fields
Journal title
Physical review. D. Particles and fields → ACNP
ISSN journal
05562821
Volume
56
Issue
8
Year of publication
1997
Pages
4916 - 4921
Database
ISI
SICI code
0556-2821(1997)56:8<4916:HATTEO>2.0.ZU;2-4
Abstract
We present the Heisenberg-picture approach to the quantum evolution of the scalar fields in an expanding Friedmann-Robertson-Walker universe which incorporates relatively simply the initial quantum conditions s uch as the vacuum state, the thermal equilibrium state, and the cohere nt state. We calculate the Wightman function, two-point function, and correlation function of a massive scalar field. We find the quantum ev olution of fluctuations of a self-interacting field perturbatively and discuss the renormalization of field equations. [S0556-2821(97)06018- 9]. PACS number(s): 04.62.+v.