An Optimised Perturbation Expansion For a Global O(2) Theory
T. S. Evans, M. Ivin, M. Mobius
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.
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