paper

Field Theory on Newton-Cartan Backgrounds and Symmetries of the Lifshitz Vacuum

arXiv:1502.00228 · doi:10.1007/JHEP08(2015)006

Abstract

Holography for Lifshitz space-times corresponds to dual field theories on a fixed torsional Newton-Cartan (TNC) background. We examine the coupling of non-relativistic field theories to TNC backgrounds and uncover a novel mechanism by which a global U(1) can become local. This involves the TNC vector which sources a particle number current, and which for flat NC space-time satisfies with a Schroedinger symmetry realized on . We discuss various toy model field theories on flat NC space-time for which the new mechanism leads to extra global space-time symmetries beyond the generic Lifshitz symmetry, allowing for an enhancement to Schroedinger symmetry. On the holographic side, the source also appears in the Lifshitz vacuum with exactly the same properties as for flat NC space-time. In particular, the bulk diffeomorphisms that preserve the boundary conditions realize a Schroedinger algebra on , allowing for a conserved particle number current. Finally, we present a probe action for a complex scalar field on the Lifshitz vacuum, which exhibits Schroedinger invariance in the same manner as seen in the field theory models.

55 pages + 2 appendices

References in corpus (25)

Cited by in corpus (61)