Global 3-group symmetry and ’t Hooft anomalies in axion electrodynamics

Global symmetries and ’t Hooft anomalies in brane tilings

We investigate the relation between gauge theories and brane configurations described by brane tilings. We identify U(1)B (baryonic), U(1)M (mesonic), and U(1)R global symmetries in gauge theories with gauge symmetries in the brane configurations. We also show that U(1)MU(1) 2 B and U(1)RU(1) 2 B ’t Hooft anomalies are reproduced as gauge transformations of the classical brane action. ∗E-mail: ...

Wave propagation in axion electrodynamics

In this paper, the axion contribution to the electromagnetic wave propagation is studied. First we show how the axion electrodynamics model can be embedded into a premetric formalism of Maxwell electrodynamics. In this formalism, the axion field is not an arbitrary added Chern-Simon term of the Lagrangian, but emerges in a natural way as an irreducible part of a general constitutive tensor. We ...

Symmetry breaking induced by ’t Hooft non-abelian flux

We analyze a SU(N) gauge theory on M4 × T . We find and catalogue all possible degenerate zero-energy stable configurations in the case of trivial or non-trivial ’t Hooft non abelian flux. We describe the residual symmetries of each vacua and the 4-dimensional effective spectrum in terms of continous and discrete parameters, respectively.

Symmetry in Electrodynamics

Dilaton – Axion Symmetry

The heterotic string compactified on a six-torus is described by a low-energy effective action consisting of N=4 supergravity coupled to N=4 super Yang-Mills, a theory that was studied in detail many years ago. By explicitly carrying out the dimensional reduction of the massless fields, we obtain the bosonic sector of this theory. In the Abelian case the action is written with manifest global O...