Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-02-09
JHEP 1003:132,2010
Physics
High Energy Physics
High Energy Physics - Theory
V1: 13 pages, 10 figures, V2: References added
Scientific paper
10.1007/JHEP03(2010)132
The large N_c N=4 gauge theory with quenched N=2 quark matter in the presence of a magnetic field displays chiral symmetry breaking. We study the temperature and chemical potential dependence of this theory using its gravity dual (based on the D3/D7 brane system). With massless quarks, at zero chemical potential, the theory displays a first order thermal transition where chiral symmetry is restored and simultaneously the mesons of the theory melt. At zero temperature, these transitions with chemical potential are second order and occur at different chemical potential values. Between the three there are two tri-critical points, the positions of which we identify. At finite quark mass the second order transition for chiral symmetry becomes a cross over and there is a critical point at the end of the first order transition, while the meson melting transition remains similar to the massless quark case. We track the movement of the critical points as the mass is raised relative to the magnetic field.
Evans Nick
Gebauer Astrid
Kim Keun-Young
Magou Maria
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