Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-04-24
JHEP 0909:032,2009
Physics
High Energy Physics
High Energy Physics - Theory
30 pages, 13 figures, v2. references added, minor corrections made
Scientific paper
10.1088/1126-6708/2009/09/032
We study the holographic D3/D7 setup dual to N=4 supersymmetric Yang-Mills with quenched fundamental matter. We extend the previous analyses of conductivity and photoproduction to the case where there is a finite electric field. Due to the electric field a special region in the D7-brane geometry, labelled the singular shell, appears generically, and the computation of correlators involves a careful study of the indicial exponents both at this singular region and at the horizon. We show that there is a unique choice consistent with the known expression for the electrical conductivity found by Karch and O'Bannon. We explore the parameter space spanned by the quark mass, the baryon density and the electric field. We find a region where the conductivity and photoproduction change rapidly and trace this behavior to competing effects which manifest themselves as a crossover behavior in the probe brane embeddings.
Mas Javier
Shock Jonathan P.
Tarrio Javier
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