Symmetric superfluids
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Peer-reviewed
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Abstract
We present a complete classification of symmetric superfluids, namely
shift-symmetric and Poincar'{e} invariant scalar field theories that have an
enlarged set of classically conserved currents at leading order in derivatives.
These theories arise in the decoupling limit of the effective field theory of
shift-symmetric, single-clock cosmologies and our results pick out all models
with couplings fixed by additional symmetry. Remarkably, in $ D\geq 2 $
spacetime dimensions there are only two possibilities: the Dirac-Born-Infeld
theory and Scaling Superfluids with Lagrangian
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1029-8479