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.
Authors / Affiliations: mappings to Contributors and OrganizationsSee all Organizations.
- Durham University
- European Cooperation in Science and Technology
- Københavns Universitet
- Max-Planck-Institut für Physik Komplexer Systeme
- Science and Technology Facilities Council [STFC]
- Universita degli Studi di Genova (UniGe) (through Organization: Università degli Studi di Genova / University of Genoa [UniGe])