Functional renormalization group flows of a relativistic complex scalar at finite chemical potential confirm that the condensate vanishes for d≤2 in agreement with Mermin-Wagner, while surviving for d>2.
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FRG analysis for a relativistic BEC in arbitrary spatial dimensions
Functional renormalization group flows of a relativistic complex scalar at finite chemical potential confirm that the condensate vanishes for d≤2 in agreement with Mermin-Wagner, while surviving for d>2.