Cherman Aleksey, Sen Srimoyee, Ünsal Mithat, Wagman Michael L, Yaffe Laurence G
Institute for Nuclear Theory, University of Washington, Seattle, Washington 98105, USA.
Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.
Phys Rev Lett. 2017 Dec 1;119(22):222001. doi: 10.1103/PhysRevLett.119.222001. Epub 2017 Nov 29.
Common lore suggests that N-color QCD with massive quarks has no useful order parameters that can be nontrivial at zero baryon density. However, such order parameters do exist when there are n_{f} quark flavors with a common mass and d≡gcd(n_{f},N)>1. These theories have a Z_{d} color-flavor center symmetry arising from intertwined color center transformations and cyclic flavor permutations. The symmetry realization depends on the temperature, baryon chemical potential, and value of n_{f}/N, with implications for conformal window studies and dense quark matter.
通常的观点认为，具有重夸克的(N)色量子色动力学（QCD）没有在零重子密度下非平凡的有用序参量。然而，当存在(n_f)个具有相同质量的夸克味且(d \equiv \gcd(n_f, N) > 1)时，这样的序参量确实存在。这些理论具有由交织的色中心变换和循环味置换产生的(Z_d)色味中心对称性。对称性的实现取决于温度、重子化学势以及(n_f / N)的值，这对共形窗口研究和致密夸克物质有影响。
