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2-group global symmetries, hydrodynamics and holography

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arxiv 2010.00320 v2 pith:5XDGHYDD submitted 2020-10-01 hep-th astro-ph.HEcond-mat.str-elnucl-th

2-group global symmetries, hydrodynamics and holography

classification hep-th astro-ph.HEcond-mat.str-elnucl-th
keywords globalgroupsymmetrieshydrodynamicssymmetrytheoryalongaspects
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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2-group global symmetries are a particular example of how higher-form and conventional global symmetries can fuse together into a larger structure. We construct a theory of hydrodynamics describing the finite-temperature realization of a 2-group global symmetry composed out of $U(1)$ zero-form and $U(1)$ one-form symmetries. We study aspects of the thermodynamics from a Euclidean partition function and derive constitutive relations for ideal hydrodynamics from various points of view. Novel features of the resulting theory include an analogue of the chiral magnetic effect and a chiral sound mode propagating along magnetic field lines. We also discuss a minimalist holographic description of a theory dual to 2-group global symmetry and verify predictions from hydrodynamic descriptions. Along the way we clarify some aspects of symmetry breaking in higher-form theories at finite temperature.

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Cited by 9 Pith papers

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