162 research outputs found
Complete Phase Diagrams for a Holographic Superconductor/Insulator System
The gravitational dual of an insulator/superconductor transition driven by
increasing the chemical potential has recently been constructed. However, the
system was studied in a probe limit and only a part of the phase diagram was
obtained. We include the backreaction and construct the complete phase diagram
for this system. For fixed chemical potential there are typically two phase
transitions as the temperature is lowered. Surprisingly, for a certain range of
parameters, the system first becomes a superconductor and then becomes an
insulator as the temperature approaches zero. As a byproduct of our analysis,
we also construct the gravitational dual of a Bose-Einstein condensate of
glueballs in a confining gauge theory.Comment: 19 pages; v2: references adde
Localised Black Holes
We numerically construct asymptotically global black holes that are localised on the . These are
solutions to type IIB supergravity with horizon topology that
dominate the theory in the microcanonical ensemble at small energies. At higher
energies, there is a first-order phase transition to
-Schwarzschild. By the AdS/CFT
correspondence, this transition is dual to spontaneously breaking the
R-symmetry of super Yang-Mills down to . We extrapolate
the location of this phase transition and compute the expectation value of the
resulting scalar operators in the low energy phase.Comment: 11 pages, 6 figure
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