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arXiv 1708.08031hep-lat
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QCD与695个MeV动力学费米子的有限密度跃迁线

A finite-density transition line for QCD with 695 MeV dynamical fermions

Jeff Greensite, Roman Höllwieser

摘要:

我们将相对权方法应用于SU(3)规范理论,在$151 \le T \le 267$ MeV范围内的一组温度下,得到了质量为695 MeV的交错费米子的有效Polyakov线作用量。然后,我们应用平均场方法搜索相变在有限密度的有效理论。结果是在温度和化学势平面上的一条过渡线,正如预期的那样,在高温处有一个端点,但在较低温度处也有第二个端点。我们不能排除跃迁线在低于所研究的温度范围内重新出现的可能性,或者轻夸克不存在第二个端点。

英文摘要:

We apply the relative weights method to SU(3) gauge theory with staggered fermions of mass 695 MeV at a set of temperatures in the range $151 \le T \le 267$ MeV, to obtain an effective Polyakov line action at each temperature. We then apply a mean-field method to search for phase transitions in the effective theory at finite densities. The result is a transition line in the plane of temperature and chemical potential, with an endpoint at high temperature, as expected, but also a second endpoint at a lower temperature. We cannot rule out the possibilities that a transition line reappears at temperatures lower than the range investigated, or that the second endpoint is absent for light quarks.

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