  In this paper, to be closer to the realities of the relativistic heavy ion
collisions than the thermal equilibrium assumption often used in the
calculations of baryon number susceptibilities, the creatures of the collisions
are treated as isotropic systems with temperature gradient. In addition, the
quarks are thought as the quasi-particles with thermal masses. By doing these
and according to Boltzmann transport equation, we get our results of the
experimental observables $S\sigma$ and $\kappa\sigma^2$. We found that the
results show a gap in value and a centrality dependence, which might indicate
the relation between the baryon number susceptibilities and the temperature
gradient in QGP.

High Energy Physics - Phenomenology