Mass expansions of screened perturbation theory - art. no. 105012

Citation
Jo. Andersen et M. Strickland, Mass expansions of screened perturbation theory - art. no. 105012, PHYS REV D, 6410(10), 2001, pp. 5012
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6410
Issue
10
Year of publication
2001
Database
ISI
SICI code
0556-2821(20011115)6410:10<5012:MEOSPT>2.0.ZU;2-J
Abstract
The thermodynamics of massless phi (4) theory is studied within screened pe rturbation theory (SPT). In this method the perturbative expansion is reorg anized by adding and subtracting a mass term in the Lagrangian. We analytic ally calculate the pressure and entropy to three-loop order and the screeni ng mass to two-loop order, expanding in powers of m/T. The truncated m/T ex pansion results are compared with numerical SPT results for the pressure, e ntropy and screening mass which are accurate to all orders in m/T. It is sh own that the m/T expansion converges quickly and provides an accurate descr iption of the thermodynamic functions for large values of the coupling cons tant.