High-temperature expansions in continuum quantum field theory

✍ Scribed by K. Dietz; Th. Millack

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 680 KB
• Volume: 141
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/0378-4371(87)90265-2

✦ Synopsis

High-temperature or, equivalently, strong coupling expansions are established by applying heat-kernel techniques to the Green's functional of the Schrodinger picture of quantum field theory. The trace of the Green's functional is considered and a high-temperature expansion for the partition function is derived. It is shown that a simple, physically motivated resealing of parameters leads to well-defined expressions. A generalized Thomas-Fermi expansion for the density of states is finally obtained.