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arXiv 0905.4417hep-lathep-th
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Gross-Neveu模型中反常的离散手征对称性和环状气体模拟

Anomalous discrete chiral symmetry in the Gross-Neveu model and loop gas simulations

Oliver Bär, Willi Rath, Ulli Wolff

摘要:

研究了环面上Majorana费米子的离散手征变换。根据边界条件,积分测度可以改变符号。考虑到这一反常行为,我们定义了一个手性序参量的比例配分函数与不同的边界条件。然后,格点实现的Gross-Neveu模型与威尔逊费米子使用最近的'蠕虫'技术上的回路气体或所有阶跳跃表示的费米子模拟。一个算法制定,包括N费米子物种的Gross-Neveu相互作用。以N = 6和N = 2的Thirring模型为例,构造了一系列耦合的临界线m_c(g)。

英文摘要:

We investigate the discrete chiral transformation of a Majorana fermion on a torus. Depending on the boundary conditions the integration measure can change sign. Taking this anomalous behavior into account we define a chiral order parameter as a ratio of partition functions with differing boundary conditions. Then the lattice realization of the Gross-Neveu model with Wilson fermions is simulated using the recent `worm' technique on the loop gas or all-order hopping representation of the fermions. An algorithm is formulated that includes the Gross-Neveu interaction for N fermion species. The critical line m_c(g) is constructed for a range of couplings at N = 6 and for N = 2, the Thirring model, as examples.

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