Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-10-07
Phys.Rev.D81:045011,2010
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, 2 figures, minor corrections, version published in PRD
Scientific paper
10.1103/PhysRevD.81.045011
We show that in four-dimensional gauge theories dual to five-dimensional Einstein gravity coupled to a single scalar field in the bulk the derivative of the single heavy quark free energy in the deconfined phase is $dF_{Q}(T)/dT \sim -1/c_s^2(T)$, where $c_s(T)$ is the speed of sound. This general result provides a direct link between the softest point in the equation of state of strongly-coupled plasmas and the deconfinement phase transition described by the expectation value of the Polyakov loop. We give an explicit example of a gravity dual with black hole solutions that can reproduce the lattice results for the expectation value of the Polyakov loop and the thermodynamics of SU(3) Yang-Mills theory in the (non-perturbative) temperature range between $T_c$ and $3T_c$.
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