In the paper we discuss the role of the axial U (1)A symmetry in the chiral phase transition using the U (N f )R × U (N f )L linear sigma model with two massless quark flavors. It is expected that above a certain temperature the axial U (1)A symmetry will be restored. A string-like static solution, the η string can be formed and detected in the ultrarelativistic heavy-ion collision process.
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