Contribution invited talk
The QCD critical point hunt:new theoretical development and the first result from simulation
Experimentally locating the QCD critical point is one of the important scientific goals for the relativistic heavy-ion collision program, with potential connections to a plethora of deep questions on the phase diagram of nuclear matter. I will first argue based on simple parametric reasonings that there shall emerge a set of new dynamical degrees of freedom for the system evolving near the critical point. As a result, the conventional hydrodynamic modeling in heavy-ion collisions would not be sufficient for the purpose of the quantitative study of the critical point. Instead, I will present a novel theoretical framework, namely “hydro+”, which couples those emergent degrees of freedom to hydrodynamical variables. "Hydro+" would provide a quantitative description of both the critical fluctuations and the bulk evolution near the QCD critical point. I will show the first results on the numerical simulations of “hydro+”, and, if time is permitted, discuss the interesting connection of “hydro+” to other approaches of fluctuating hydrodynamics.