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arXiv 0904.1353hep-lathep-th
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具有伴随费米子的QCD的有限尺寸相变

Finite size phase transitions in QCD with adjoint fermions

Guido Cossu, Massimo D'Elia

摘要:

我们在一维紧致化的四维空间上,对具有三种颜色和两种味道的Dirac(交错)费米子的伴随表象的QCD进行了晶格研究,并研究了该理论的相结构随紧致化维数Lc的变化.我们发现,四个不同的阶段发生,对应于不同的实现中心对称性:两个中心对称的阶段,为大或小的值的LC,分离的两个阶段中,中心对称性被打破在两种不同的方式,这些结果的依赖关系上的夸克质量进行了讨论。我们还研究了手征性质,以及它们如何受到不同的实现中心对称性的影响;手征对称性,特别是,保持自发破缺的相变,并可能恢复在低得多的值的紧化半径。我们的结果可能与最近提出的在大Nc极限下伴随费米子的QCD体积独立性的猜想有关。

英文摘要:

We perform a lattice investigation of QCD with three colors and 2 flavors of Dirac (staggered) fermions in the adjoint representation, defined on a 4d space with one spatial dimension compactified, and study the phase structure of the theory as a function of the size Lc of the compactified dimension. We show that four different phases take place, corresponding to different realizations of center symmetry: two center symmetric phases, for large or small values of Lc, separated by two phases in which center symmetry is broken in two different ways; the dependence of these results on the quark mass is discussed. We study also chiral properties and how they are affected by the different realizations of center symmetry; chiral symmetry, in particular, stays spontaneously broken at the phase transitions and may be restored at much lower values of the compactification radius. Our results could be relevant to a recently proposed conjecture of volume indepedence of QCD with adjoint fermions in the large Nc limit.

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