An Optimised Perturbation Expansion For a Global O(2) Theory

Abstract

We use an optimised perturbation expansion called the linear delta-expansion to study the phase transition in a Higgs sector with a continuous symmetry and large couplings. Our results show how to use this non-perturbative method successfully for such problems. We also show how to simplify the method without losing any flexibility.

LaTeX2e, 15 pages, 12 eps figures

References in corpus (3)

• On the Phase Structure of the 3D SU(2)--Higgs Model and the Electroweak Phase Transition
• An Analytical Approach to Lattice Gauge-Higgs Models
• Dynamical linke cluster expansions: Algorithmic aspects and applications

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• The Effect of Weak Interactions on the Ultra-Relativistic Bose-Einstein Condensation Temperature
• Non-perturbative calculations of a global U(1) theory at finite density and temperature
• Testing an Optimised Expansion on Z_2 Lattice Models