首页    期刊浏览 2024年11月24日 星期日
登录注册

文章基本信息

  • 标题:The curvature of the critical surface (m_ud,m_s)^{crit}(mu): a progress report
  • 本地全文:下载
  • 作者:P. de-Forcrand
  • 期刊名称:PoS - Proceedings of Science
  • 印刷版ISSN:1824-8039
  • 出版年度:2008
  • 卷号:2008
  • 出版社:SISSA, Scuola Internazionale Superiore di Studi Avanzati
  • 摘要:At zero chemical potential m, the order of the temperature-driven quark-hadron transition depends on the quark masses mu,d and ms. Along a critical line bounding the region of first-order chiral transitions in the (mu,d,ms) plane, this transition is second order. When the chemical potential is turned on, this critical line spans a surface, whose curvature at m = 0 can be determined without any sign or overlap problem. Our past measurements on Nt = 4 lattices suggest that the region of quark masses for which the transition is first order shrinks when m is turned on, which makes a QCD chiral critical point at small m/T unlikely. We present results from two complementary methods, which can be combined to yield information on higher-order terms. It turns out that the O(m4) term reinforces the effect of the leading O(m2) term, and there is strong evidence that the O(m6) and O(m8) terms do as well. We also report on simulations underway, where the strange quark is given its physical mass, and where the lattice spacing is reduced.
国家哲学社会科学文献中心版权所有