Free energy in thermo field dynamics

Journal Article · Thu Mar 14 23:00:00 EST 1985 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.31.1495· OSTI ID:5991047

Matsumoto, H; Nakano, Y; Umezawa, H

A formula to obtain the free energy within the framework of thermo field dynamics (a real-time quantum field theory at finite temperature) is presented. The relation to the Matsubara method is discussed. Examples of a perturbation calculation are presented for the phi/sup 4/ model up to the two-loop order and are compared with the corresponding result obtained in the Matsubara formalism.

• Research Organization: Theoretical Physics Institute, Department of Physics, The University of Alberta, Edmonton, Alberta, Canada T6G 2J1
• OSTI ID: 5991047
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 31:6; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ENERGY
FIELD THEORIES
FREE ENERGY
HAMILTONIANS
MATHEMATICAL OPERATORS
PERTURBATION THEORY
PHI4-FIELD THEORY
PHYSICAL PROPERTIES
QUANTUM FIELD THEORY
QUANTUM OPERATORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
VACUUM STATES