Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-12-17
JHEP 1003:100,2010
Physics
High Energy Physics
High Energy Physics - Theory
19 pages - v2: minor corrections and additional references -v3: Figs.5 changed and additional comments. Version accepted in JH
Scientific paper
10.1007/JHEP03(2010)100
We study Einstein-Maxwell-dilaton gravity models in four-dimensional anti-de Sitter (AdS) spacetime which admit the Reissner-Nordstrom (RN) black hole solution. We show that below a critical temperature the AdS-RN solution becomes unstable against scalar perturbations and the gravitational system undergoes a phase transition. We show using numerical calculations that the new phase is a charged dilatonic black hole. Using the AdS/CFT correspondence we discuss the phase transition in the dual field theory both for non-vanishing temperatures and in the extremal limit. The extremal solution has a Lifshitz scaling symmetry. We discuss the optical conductivity in the new dual phase and find interesting behavior at low frequencies where it shows a "Drude peak". The resistivity varies with temperature in a non-monotonic way and displays a minimum at low temperatures which is reminiscent of the celebrated Kondo effect.
Cadoni Mariano
D'Appollonio Giuseppe
Pani Paolo
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