Abstract
The finite temperature phase diagram of a U(1) Higgs-Yukawa model at a finite value of the scalar self coupling λ is investigated by means of a large- N f calculation and numerical simulations. The phase diagrams is similar to the one at zero temperature and shows a ferromagnetic, two symmetric and an antiferromagnetic phase. However, the phase transition lines are shifted to larger values of the Yukawa coupling demonstrating the occurence of the finite temperature symmetry restoration.
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