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• W2081750883 abstract "We study the effective potential of a real scalar phi^4 theory as a function of the temperature T within the simplest Phi-derivable approximation, namely the Hartree approximation. We apply renormalization at a high temperature T* where the theory is required to be in its symmetric phase and study how the effective potential evolves as the temperature is lowered down to T=0. In particular, we prove analytically that no second order phase transition can occur in this particular approximation of the theory, in agreement with earlier studies based on the numerical evaluation or the high temperature expansion of the effective potential. This work is also an opportunity to illustrate certain issues on the renormalization of Phi-derivable approximations at finite temperature and non-vanishing field expectation value, and to introduce new computational techniques which might also prove useful when dealing with higher order approximations." @default.
• W2081750883 created "2016-06-24" @default.
• W2081750883 creator A5014115150 @default.
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• W2081750883 date "2011-06-24" @default.
• W2081750883 modified "2023-09-27" @default.
• W2081750883 title "Broken phase scalar effective potential andΦ-derivable approximations" @default.
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• W2081750883 doi "https://doi.org/10.1103/physrevd.83.125026" @default.
• W2081750883 hasPublicationYear "2011" @default.
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