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    • patavirt's avatar
      93168183
    • patavirt's avatar
      core: do high-energy subtraction in action evaluation · b91744ff
      patavirt authored
      Subtract constant terms (in Q) so that action Matsubara summation/energy
      integration becomes convergent at the saddle point.
      
      Since we are currently only using the Q-derivatives of the action, this
      does not change anything.
      
      However, for calculation of the free energy, this subtraction is useful
      for cutoff elimination, as it replaces the mean field term
      
          |Delta|^2 / lambda -> log(T/T_c) |\Delta|^2
      
      so that it is only defined by the weak-coupling critical temperature.
      b91744ff
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