Forming disoriented chiral condensates through fluctuations
- RIKEN-BNL Research Center, Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
Using the influence functional formalism, classical equations of motion for the O(N) model are derived in the presence of a heat bath, in both the symmetric phase as well as the phase of spontaneously broken symmetry. The heat bath leads to dissipation and fluctuation terms in the classical equations of motion, which are explicitly computed to lowest order in perturbation theory. In the broken phase these terms are found to be large for the {sigma} field, even at zero temperature, due to the decay process {sigma}{r_arrow}{pi}{pi}, while they are small for the {pi} fields at temperatures below T{sub c}{approx_equal}160 MeV. It is shown that in large volumes the presence of dissipation and fluctuations suppresses the formation of disoriented chiral condensates (DCC{close_quote}s). In small volumes, however, fluctuations become sufficiently large to induce the formation of DCC{close_quote}s even if chiral symmetry has not been restored in the initial stage of the system{close_quote}s evolution. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 659347
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 4 Vol. 58; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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