Convexity and tadpoles |
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Authors: | D Johnston |
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Institution: | 1. Blackett Laboratory, Imperial College, SW7 2BZ, London, UK
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Abstract: | We show that it is possible to produce a convex effective potential using the tadpole method of calculation, both at zero temperature and in real time finite-temperature quantum field theory. We point out, however, that this does not evade the failure of the loop expansion in a theory with a non-convex classical potential at a temperature where the minima of the effective potential have moved in to the classical points of inflection. |
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