Quark mass density- and temperature-dependent model for strange quark matter

It is found that the radius of a stable strangelet decreases as the temperature increases in a quark mass density-dependent model. To overcome this difficulty, we extend this model to a quark mass density- and temperature-dependent model in which the vacuum energy density at zero baryon density limit B depends on temperature. An ansatz which reads $B=B_0[1-a({T/T_\ab{c}})+b({T/T_\ab{c}})^2]$ is introduced and the regions for the best choice of the parameters are studied.