Chiral phase transition of QCD with Nf=2+1 flavors from holography

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Chiral phase transition for three-flavor Nf=2+1 QCD with mᵤ=md≠ mₛ is investigated in a modified soft-wall holographic QCD model. Solving temperature dependent chiral condensates from equations of motion of the modified soft-wall model, we extract the quark mass dependence of the order of chiral phase transition in the case of Nf=2+1, and the result is in agreement with the "Colombia Plot", which is summarized from lattice simulations and other non-perturbative methods. First order phase transition is observed around the three flavor chiral limit mᵤ/d=0, mₛ=0, while at sufficient large quark masses it turns to be a crossover phase transition. The first order and crossover regions are separated by a second order phase transition line. The second order line is divided into two parts by the mᵤ/d=mₛ line, and the mₛ dependence of the transition temperature in these two parts are totally contrast, which might indicate that the two parts are governed by different universality classes.