Quark Number Susceptibility around the Chiral Critical End Point

We calculate the quark number susceptibility (QNS) around the chiral critical end point (CEP). The CEP is found to be located at (μ_c,T_c) = (80 MeV, 148 MeV) where μ_c and T_c are the critical chemical potential and temperature, respectively. The QNS is found to have the highest and sharpest peak at the CEP. It is also found that, when the chemical potential μ is in the range of 60 MeV ≤μ≤110 MeV, the QNS near the transition temperature is larger than the free field result, which indicates that the space-like damping mode dominates the degree of freedom of motion near the CEP.