Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-09-11
JHEP 0712:091,2007
Physics
High Energy Physics
High Energy Physics - Theory
34 pages, 18 figures, v2: added references and comments on mode decoupling, on thermodynamics and holographic renormalisation,
Scientific paper
10.1088/1126-6708/2007/12/091
We investigate gauge/gravity duals with flavour for which pure-gauge Kalb-Ramond B fields are turned on in the background, into which a D7 brane probe is embedded. First we consider the case of a magnetic field in two of the spatial boundary directions. We show that at finite temperature, i.e. in the AdS-Schwarzschild background, the B field has a stabilizing effect on the mesons and chiral symmetry breaking occurs for a sufficiently large value of the B field. Then we turn to the electric case of a B field in the temporal direction and one spatial boundary direction. In this case, there is a singular region in which it is necessary to turn on a gauge field on the brane in order to ensure reality of the brane action. We find that the brane embeddings are attracted towards this region. Far away from this region, in the weak field case at zero temperature, we investigate the meson spectrum and find a mass shift similar to the Stark effect.
Erdmenger Johanna
Meyer Rene
Shock Jonathan P.
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