Journal article

Publication year: 2004

Pages: 92-126

Journal: Nuclear Physics A: Nuclear and Hadronic Physics

Volume number: 743

Issue number: 1-3

ISSN: 0375-9474

eISSN: 1873-1554

Open access status: Green

DOI Link: https://doi.org/10.1016/j.nuclphysa.2004.07.010

Publisher: Elsevier

Abstract: 
We solve the Kadanoff-Baym equations for nonequilibrium initial configurations of the phi(4)-theory in 2 + 1 dimensions and compare to explicit solutions of generalized transport equations for the same theory. The latter transport equations are derived from the Kadanoff-Baym equation in a first order gradient expansion in phase-space and explicitly retain the off-shell dynamics as inherent in the time-dependent spectral functions. The solutions of these equations compare very well with the exact solutions of the full Kadanoff-Baym equations with respect to the occupation numbers of the individual modes, the spectral evolution as well as the chemical equilibration process. Furthermore, the proper equilibrium off-shell distribution is reached for large times contrary to the quasiparticle Boltzmann limit. We additionally present a direct comparison of the solution of the generalized transport equations in the Kadanoff-Baym and Botermans-Malfliet form; both solutions are found to agree very well with each other. (C) 2004 Elsevier B.V. All rights reserved.

Harvard Citation style: Juchem, S., Cassing, W. and Greiner, C. (2004) Nonequilibrium quantum-field dynamics and off-shell transport for φ⁴-theory in 2+1 dimensions, Nuclear Physics A: Nuclear and Hadronic Physics, 743(1-3), pp. 92-126. https://doi.org/10.1016/j.nuclphysa.2004.07.010

APA Citation style: Juchem, S., Cassing, W., & Greiner, C. (2004). Nonequilibrium quantum-field dynamics and off-shell transport for φ⁴-theory in 2+1 dimensions. Nuclear Physics A: Nuclear and Hadronic Physics. 743(1-3), 92-126. https://doi.org/10.1016/j.nuclphysa.2004.07.010