Speaker
Prof.
Keijo Kajantie
(Helsinki Institute of Physics)
Description
I will discuss a holographic model of finite temperature and density QCD matter with a large and roughly equal number of colors and flavours. The basic framework of the model is 5-dimensional classical Einstein gravity with a black hole and with an AdS$_5$ boundary, on which the physical 4-dimensional quantum theory resides. The model further contains a scalar dilaton for asymptotic freedom and confinement, a scalar tachyon for chiral symmetry breaking and a charge density for chemical potential. Solving the classical gravity equations numerically leads to an identification of a chirally symmetric and chirally broken phase with a phase transition in between. The phase transition line on the $T,\mu$ plane can have both 2nd and 1st order segments. The computation can be extended down to the quantum phase transition at $T=0$. The dilaton and tachyon potentials are only constrained by physical properties, not uniquely determined. Until they are derived one cannot make definite predictions, the model rather is a framework for discussing various dynamical alternatives.
Author
Prof.
Keijo Kajantie
(Helsinki Institute of Physics)
