Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-03-03
JHEP 0908:057,2009
Physics
High Energy Physics
High Energy Physics - Theory
37 pages, 9 figures
Scientific paper
10.1088/1126-6708/2009/08/057
We study the dynamics of probe D7 $\overline{\rm D7}$ flavor probe branes in the background of near extremal D5 branes. This model is a holographic dual to a gauge theory with spontaneous breaking of a $U(N_f)_L\times U(N_f)_R$ chiral symmetry. The spectrum of two such D7 $\overline{\rm D7}$ embeddings, contains a single massive 4D meson coming from the world volume U(1) gauge field, the pion, and a single massive 4D scalar meson coming from fluctuations of the embedding of the brane. In addition, there are continuum five dimensional states due to the finite height of the effective potential in the radial direction. We investigate baryons in this model, and find that the size is stabilized due to the Chern-Simons term in the D7 world volume action. The model admits a Hagedorn temperature of $\frac{1}{2\pi R}$ where $R$ is the radius parameter in the D5 branes metric. We investigate the pattern of chiral symmetry breaking in the deconfined phase as a function of the asymptotic separation of the branes $L$. We find that for $\frac{\pi}{3}R
Burrington Benjamin A.
Sonnenschein Jacob
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