Variational approach to thermal masses in compactified models
Abstract
We investigate by means of a variational approach the effective potential of a 5D U(1) scalar model at finite temperature and compactified on S1 and S1/Z2 as well as the corresponding 4D model obtained through a trivial dimensional reduction. We are particularly interested in the behaviour of the thermal masses of the scalar field with respect to the Wilson line phase and the results obtained are compared with those coming from a one-loop effective potential calculation. We also explore the nature of the phase transition.
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