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  • 1
    Electronic Resource
    Electronic Resource
    Heisenberg and interaction representations in thermo field dynamics (1992)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 33 (1992), S. 370-378 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In this paper the so-called α degree of freedom appearing in thermal quantum field theory is discussed, using thermo field dynamics (TFD). This paper is confined to stationary thermal situations, both nonequilibrium and equilibrium. The main result is that when the stationary number distribution differs from the equilibrium one the use of time ordered and antitime ordered formalisms picks up α=1 and α=0, in contrast to the general belief that the Feynman diagram method is usable for any other α as well. This situation in TFD will be compared with the other approaches. The reason why the Feynman diagram method becomes available for any α in the case of the equilibrium distributions is also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529915
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Wick's theorem for nonsymmetric normal ordered products and contractions (1998)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 39 (1998), S. 5726-5738 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: We consider arbitrary splits of field operators into two parts; ψ=ψ++ψ−, and use the corresponding definition of normal ordering introduced earlier [T. S. Evans and D. A. Steer, Nucl. Phys. B 474, 481 (1996)]. In this case the normal ordered products and contractions have none of the special symmetry properties assumed in existing proofs of Wick's theorem. Despite this, we prove that Wick's theorem still holds in its usual form as long as the contraction is a c-number. Wick's theorem is thus shown to be much more general than existing derivations suggest, and we discuss possible simplifying applications of this result. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.532589
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  • 3
    Electronic Resource
    Electronic Resource
    Zero momentum calculations for finite temperature field theory (1987)
    Springer
    The European physical journal 36 (1987), S. 153-162 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Problems with calculations of Feynaman diagrams with no external leg carrying non-zero momentum for a finite temperature scalar field theory using a real time path integral approach are considered. The necessary extra rules for all such calculations are derived, covering all the usual methods of calculating the effective potential, and several problems with such calculations from the path integral viewpoint are resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01556175
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The chiral phase transition in QCD (1988)
    Springer
    The European physical journal 40 (1988), S. 293-297 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Chiral Phase Transition in QCD is studied analytically by looking at truncations of the Schwinger-Dyson equation for the quark self-mass. We find that the usual implementation of the gluon propagator at non-zero temperature is far too simple. When the gluons are given the correct qualitative non-zero temperature behaviour, the calculation of the critical temperature changes significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01555892
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  • 5
    Electronic Resource
    Electronic Resource
    Real time thermal propagators for massive gauge bosons (1995)
    Springer
    The European physical journal 65 (1995), S. 123-126 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We derive Feynman rules for gauge theories exhibiting spontaneous symmetry breaking using the real-time formalism of finite temperature field theory. We also derive the thermal propagators where only the physical degrees of freedom are given thermal boundary conditions. We analyse the abelian Higgs model and find that these new propagators simplify the calculation of the thermal contribution to the self energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571312
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    Paper (German National Licenses)
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