标题： 从虚化学势得到的小密度QCD相图 显示英文标题

标题： The QCD phase diagram for small densities from imaginary chemical potential

摘要： 我们展示了对于μ_B ≤ πT的QCD相图结果。我们的模拟是使用虚化学势μ_I进行的，此时费米子行列式为正。 在8^3 x 4格点上，具有2种渐近夸克风味，我们绘制了相图并确定了伪临界温度T_c(μ_I)。 对于μ_I/T ≤ π/3，这是一个解析函数，其泰勒展开被发现收敛迅速，截断误差远小于统计误差。 然后可以将截断级数延续到实μ，得到对应μ_B <~ 500 MeV的相图。 这种方法可以控制系统误差并避免重新加权。 我们将其与其他最新工作进行了比较。 显示英文摘要

摘要： We present results on the QCD phase diagram for mu_B <= pi T. Our simulations are performed with an imaginary chemical potential mu_I for which the fermion determinant is positive. On an 8^3 x 4 lattice with 2 flavors of staggered quarks, we map out the phase diagram and identify the pseudo-critical temperature T_c(mu_I). For mu_I/T <= pi/3, this is an analytic function, whose Taylor expansion is found to converge rapidly, with truncation errors far smaller than statistical ones. The truncated series may then be continued to real mu, yielding the corresponding phase diagram for mu_B <~ 500 MeV. This approach provides control over systematics and avoids reweighting. We compare it with other recent work.