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Particles and Fields
Eur. Phys. J. C 18, 353-358
DOI 10.1007/s100520000455

A new approach to the determination
of the critical couplings for a deconfinement phase transition
in the variational-cumulant expansion

Q. Lu1 - H. Li1 - T. Chen2

1 Department of Physics, Nankai University, Tianjin 300071, P.R. China
2 CCAST (World Laboratory) P.O. Box 8730, 10080 Beijing, P.R. China

Received: 23 February 2000 / Revised version: 19 May 2000 /
Published online: 27 November 2000 - © Springer-Verlag 2000

Abstract
Based on the variational-cumulant expansion (VCE), a new approach is adopted to determine the critical couplings for the deconfinement phase transition in SU(2) gauge theory for $N_{\tau} =2,3,4$, and with both the standard Wilson action and the improved tree-level Symansik action. New results of the VCE which are close to the data of Monte Carlo (MC) simulations make manifest that the new approach is much more effective than the traditional one and show the consistence of a VCE analysis with an MC simulation.


Copyright Società Italiana di Fisica, Springer-Verlag 2000