BARTON EXPANSION AND THE PATH-INTEGRAL APPROACH IN THERMAL FIELD-THEORY

Authors
BRANDT FT MCKEON DGC
Citation
Ft. Brandt et Dgc. Mckeon, BARTON EXPANSION AND THE PATH-INTEGRAL APPROACH IN THERMAL FIELD-THEORY, Physical review. D. Particles and fields, 54(10), 1996, pp. 6435-6443
Citations number
26
Categorie Soggetti
Physics, Particles & Fields
Journal title
Physical review. D. Particles and fields → ACNP
ISSN journal
05562821
Volume
54
Issue
10
Year of publication
1996
Pages
6435 - 6443
Database
ISI
SICI code
0556-2821(1996)54:10<6435:BEATPA>2.0.ZU;2-L
Abstract
It has been shown how on-shell forward scattering amplitudes (the ''Ba rton expansion'') and the quantum-mechanical path integral (QMPI) can both be used to compute temperature-dependent effects in thermal field theory. We demonstrate the equivalence of these two approaches and th en apply the QMPI to compute the high temperature expansion for the fo ur-point function in QED, obtaining results identical to those previou sly obtained from the Barton expansion.