TY - JOUR

T1 - A Time‐Dependent Nonequilibrium Calculational Scheme towards the Study of Temperature Fluctuations

AU - Evans, T. S.

AU - Hardman, I.

AU - Umezawa, H.

AU - Yamanaka, Yoshiya

PY - 1993

Y1 - 1993

N2 - A new perturbative scheme for interacting nonequilibrium thermal quantum fields using thermo field dynamics is outlined by explicitly considering the temporal change of the thermal vacuum as it moves through many inequivalent state vector spaces. One is then naturally led to two sources of time dependence, one from the dynamics and the other from the change of thermal vacuum, which are taken care of by the Hamiltonian and the thermal generator, respectively. To obtain a practical scheme we restrict ourselves by the demand that a spectral representation for the full propagator exists. This leads to a time dependent temperature. The addition of a diagonalization condition for the quasi‐particle Hamiltonian provides the master equation for the number density. We show that our formalism is equivalent to an extended form of the path‐ordering method. This formalism is a first step towards the study of the origin of heat and temperature in high‐energy heavy ion collisions.

AB - A new perturbative scheme for interacting nonequilibrium thermal quantum fields using thermo field dynamics is outlined by explicitly considering the temporal change of the thermal vacuum as it moves through many inequivalent state vector spaces. One is then naturally led to two sources of time dependence, one from the dynamics and the other from the change of thermal vacuum, which are taken care of by the Hamiltonian and the thermal generator, respectively. To obtain a practical scheme we restrict ourselves by the demand that a spectral representation for the full propagator exists. This leads to a time dependent temperature. The addition of a diagonalization condition for the quasi‐particle Hamiltonian provides the master equation for the number density. We show that our formalism is equivalent to an extended form of the path‐ordering method. This formalism is a first step towards the study of the origin of heat and temperature in high‐energy heavy ion collisions.

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U2 - 10.1002/prop.2190410203

DO - 10.1002/prop.2190410203

M3 - Article

AN - SCOPUS:84990700876

SN - 0015-8208

VL - 41

SP - 151

EP - 175

JO - Fortschritte der Physik

JF - Fortschritte der Physik

IS - 2

ER -