5 research outputs found
Universal chiral conductivities for low temperature holographic superfluids
We argue that the chiral conductivities of generic s-wave holographic
superfluids, whose broken U(1) symmetry is anomalous, exhibit universal
behavior at low temperatures. The universal behavior we argue for is
independent of the details of the bulk action and on the emergent geometry deep
in the bulk interior at low temperatures. Our results are contrasted against
general expectations based on an analysis of the entropy current in
superfluids.Comment: 14 pages, 2 figure
Transport in holographic superfluids
We construct a slowly varying space-time dependent holographic superfluid and
compute its transport coefficients. Our solution is presented as a series
expansion in inverse powers of the charge of the order parameter. We find that
the shear viscosity associated with the motion of the condensate vanishes. The
diffusion coefficient of the superfluid is continuous across the phase
transition while its third bulk viscosity is found to diverge at the critical
temperature. As was previously shown, the ratio of the shear viscosity of the
normal component to the entropy density is 1/(4 pi). As a consequence of our
analysis we obtain an analytic expression for the backreacted metric near the
phase transition for a particular type of holographic superfluid.Comment: 45 pages + appendice