arXiv 1111.23172011-11hep-lathep-ph

SU中的新相（3）含12个轻费米子的格点规范理论

Novel phase in SU(3) lattice gauge theory with 12 light fermions

Anqi Cheng, Anna Hasenfratz, David Schaich

备注：: 10 pages revtex. v2: significantly expanded, conclusions and abstract changed. Added discussions of Dirac eigenvalues and evidence for a phase with spontaneously broken single-site shift symmetry
发表信息：: Phys. Rev. D 85, 094509 (2012)
DOI：: 10.1103/PhysRevD.85.094509

摘要：

本文研究了SU（3）格点规范理论的相结构，在基本表象中，Nf=12个交错费米子，在零温度和有限温度下，在强规范耦合下。对于小的费米子质量，我们发现在有限的温度下，两个过渡收敛到两个分离的散装相变。这两个转变之间的阶段似乎是一个新的阶段。我们确定的序参量表明，在这一阶段的交错费米子的单站点移位对称性自发打破。我们调查的狄拉克运营商的本征值谱，静电势和介子谱，共同建立，这种新的相位是限制，但手征对称。相是接壤的一阶相变，因为我们发现相同的相结构与Nf=8费米子，我们认为，新的相位是最有可能的强耦合晶格文物，它的存在并不意味着IR保形性。

英文摘要：

We study the phase structure of SU(3) lattice gauge theory with Nf=12 staggered fermions in the fundamental representation, for both zero and finite temperature at strong gauge couplings. For small fermion masses we find two transitions at finite temperature that converge to two well-separated bulk phase transitions. The phase between the two transitions appears to be a novel phase. We identify order parameters showing that the single-site shift symmetry of staggered fermions is spontaneously broken in this phase. We investigate the eigenvalue spectrum of the Dirac operator, the static potential and the meson spectrum, which collectively establish that this novel phase is confining but chirally symmetric. The phase is bordered by first-order phase transitions, and since we find the same phase structure with Nf=8 fermions, we argue that the novel phase is most likely a strong-coupling lattice artifact, the existence of which does not imply IR conformality.

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