Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-08-28
JHEP 0701:072,2007
Physics
High Energy Physics
High Energy Physics - Theory
18 pages with 6 figures, a reference added, discussions on gauge fields are corrected, no qualitative change in the main resul
Scientific paper
10.1088/1126-6708/2007/01/072
We discuss the Sakai-Sugimoto model at finite temperature and finite chemical potential. It is a holographic model of large N_c QCD with N_f massless quarks based on a D4/D8-\bar{D8} brane system. The near horizon limit of the D4-branes and the probe approximation of the D8-\bar{D8} pairs allow us to treat the D4-branes as a gravitational background and the D8-\bar{D8} pairs as a probe which does not affect the background. We propose that the asymptotic value of a U(1) gauge field on the D8-\bar{D8}-branes is identified with the chemical potential for the baryon number. Using this chemical potential we analyze the phase structure of this model and find a chiral symmetry phase transition of the first order.
Horigome Norio
Tanii Yoshiaki
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