Impact of Vector-Current Interactions on the QCD Phase Diagram

• 作者: Kouji Kashiwa Thomas Hell Wolfram Weise
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: QCD PHASE DIAGRAM PNJL Model
• 年，卷（期）: 2013,（5）
• 页码范围: 644-650
• 页数: 7页
• 分类号: R73

摘要

Using a nonlocal version of the Polyakov-loop-extended Nambu-Jona-Lasinio model, we investigate effects of a nonderivative vector-current interaction (relating to the quark-number density) at both real and imaginary chemical potentials. This repulsive vector interaction between quarks has the following impact on the chiral first-order phase transition: at imaginary chemical potential it sharpens the transition at the Roberge-Weiss (RW) end point and moves this critical point toward lower temperatures;at real chemical potential, the critical end point moves on a trajectory towards larger chemical potentials and lower temperatures with increasing vector coupling strength. The conditions are discussed at which the first-order phase transition disappears and turns into a smooth crossover.