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Zero temperature limit of holographic superconductors

Gary T. Horowitz and Matthew M. Roberts

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We consider holographic superconductors whose bulk description consists of gravity minimally coupled to a Maxwell field and charged scalar field with general potential. We give an analytic argument that there is no ``hard gap'': the real part of the conductivity at low frequency remains nonzero (although typically exponentially small) even at zero temperature. We also numerically construct the gravitational dual of the ground state of some holographic superconductors. Depending on the charge and dimension of the condensate, the infrared theory can have emergent conformal or just Poincare symmetry. In all cases studied, the area of the horizon of the dual black hole goes to zero in the extremal limit, consistent with a nondegenerate ground state.

Keywords

Spontaneous Symmetry Breaking

Black Holes

AdS-CFT and dS-CFT Correspondence

 

E-print Number: 0908.3677

Cited: by |

Refers: to

PACS

04.70.-s Physics of black holes

04.40.-b Self-gravitating systems; continuous media and classical fields in curved spacetime

Subjects

Gravitation and cosmology

Dates

Issue 11 (November 2009)

Received 3 September 2009, accepted for publication 8 October 2009

Published 5 November 2009



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