Non critical holographic models of the thermal phases of QCD
arXiv:0711.4273 · doi:10.1088/1126-6708/2008/06/091
Abstract
We analyze the thermal phases of a non critical holographic model of QCD. The model is based on a six dimensional background of non extremal D4 branes wrapping a spacial circle of radius and the compactified Euclidean time direction of radius . We place in this background stacks of D4 and anti-D4 flavor probe branes with a separation distance at large radial direction. %The dual theory is a 4+1 dimensional gauge theory %compactified on a radius with anti-periodic boundary conditions for the fermions. The analysis of the DBI effective action yields the following phase diagram: At low temperature the system is in a confining phase with broken chiral symmetry. In the high temperature deconfining phase chiral symmetry can be either restored for or broken for . All of these phase transitions are of first order. We analyze the spectrum of the low-spin and high-spin mesons. High spin mesons above certain critical angular momentum ``melt''. We detect (no) drag for (mesons) quarks moving in hot quark-gluon fluid. The results resemble the structure and properties of the thermal Sakai-Sugimoto model derived in hep-th/0604161.
arXiv comment11 figure minor corrections
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