This thesis presents a theoretical study of homogeneous Bose and Fermi gases in their superfluid phases in one, two and three dimensions. This quantum many-body problem is formulated as a field theory and it is treated nonperturbatively using the functional renormalisation group…
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Strong interactions can dramatically change the essence of a physical system. The behavior of strongly interacting systems can be fundamentally different than those where the interaction is absent or treated perturbatively. Many examples are known in solid-state physics includin…