Functional renormalization group at finite density and Bose condensation
Svanes, Eirik E. · Andersen, Jens O.
Original · EN
We discuss the functional renormalization group and pion condensation in the presence of a finite isospin chemical potential μᵢ. We calculate the phase diagram as function of temperature T and μᵢ. While the exact effective average action is invariant under certain gauge transformations, the effective action in the local-potential approximation is not. As a consequence, the critical chemical potential μᵢᶜ for Bose-Einstein condensation at T=0 is no longer equal to the mass of the condensing mode. We discuss possible solutions to this problem.
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