### Abstract

Conventional transport theory is not really applicable to nonequilibrium systems which exhibit strong quantum effects. We present two different approaches to overcome this problem. Firstly we point out how transport equations may be derived that incorporate a nontrivial spectral function as a typical quantum effect, and test this approach in a toy model of a strongly interacting degenerate plasma. Secondly we explore a path to include nonequilibrium effects into quantum field theory through momentum mixing transformations in Fock space. Although the two approaches are completely orthogonal, they lead to the same coherent conclusion. "Dedicated to the memory of Hiroomi Umezawa, Friend and mentor, Who had the vision to unify Quantum field theory and statistical mechanics.".

Original language | English |
---|---|

Pages (from-to) | 1599-1614 |

Number of pages | 16 |

Journal | International Journal of Modern Physics B |

Volume | 10 |

Issue number | 13-14 |

Publication status | Published - 1996 Jun 30 |

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### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Mathematical Physics
- Physics and Astronomy (miscellaneous)
- Condensed Matter Physics
- Statistical and Nonlinear Physics

### Cite this

*International Journal of Modern Physics B*,

*10*(13-14), 1599-1614.

**Thermal field theory in non-equilibrium states.** / Henning, P. A.; Nakamura, K.; Yamanaka, Yoshiya.

Research output: Contribution to journal › Article

*International Journal of Modern Physics B*, vol. 10, no. 13-14, pp. 1599-1614.

}

TY - JOUR

T1 - Thermal field theory in non-equilibrium states

AU - Henning, P. A.

AU - Nakamura, K.

AU - Yamanaka, Yoshiya

PY - 1996/6/30

Y1 - 1996/6/30

N2 - Conventional transport theory is not really applicable to nonequilibrium systems which exhibit strong quantum effects. We present two different approaches to overcome this problem. Firstly we point out how transport equations may be derived that incorporate a nontrivial spectral function as a typical quantum effect, and test this approach in a toy model of a strongly interacting degenerate plasma. Secondly we explore a path to include nonequilibrium effects into quantum field theory through momentum mixing transformations in Fock space. Although the two approaches are completely orthogonal, they lead to the same coherent conclusion. "Dedicated to the memory of Hiroomi Umezawa, Friend and mentor, Who had the vision to unify Quantum field theory and statistical mechanics.".

AB - Conventional transport theory is not really applicable to nonequilibrium systems which exhibit strong quantum effects. We present two different approaches to overcome this problem. Firstly we point out how transport equations may be derived that incorporate a nontrivial spectral function as a typical quantum effect, and test this approach in a toy model of a strongly interacting degenerate plasma. Secondly we explore a path to include nonequilibrium effects into quantum field theory through momentum mixing transformations in Fock space. Although the two approaches are completely orthogonal, they lead to the same coherent conclusion. "Dedicated to the memory of Hiroomi Umezawa, Friend and mentor, Who had the vision to unify Quantum field theory and statistical mechanics.".

UR - http://www.scopus.com/inward/record.url?scp=0008122484&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0008122484&partnerID=8YFLogxK

M3 - Article

VL - 10

SP - 1599

EP - 1614

JO - International Journal of Modern Physics B

JF - International Journal of Modern Physics B

SN - 0217-9792

IS - 13-14

ER -