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arXiv 0802.3029hep-lat
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类似交错费米子但没有味道混合的格点费米子公式的根源问题

The rooting issue for a lattice fermion formulation similar to staggered fermions but without taste mixing

David H. Adams

摘要:

为了研究交错费米子行列式的四次方根技巧在一个更简单的环境中的可行性,我们考虑了一个两味(味)晶格费米子配方,没有味道混合,但与确切的味道非单线手征对称性性类似的味道非单线$U(1)_A$对称交错费米子。M. Creutz对生根技巧的反对同样适用于这种情况。为了对抗它们,我们证明了该公式在拓扑非平凡的规范背景中具有鲁棒的可能的零模,并且这些零模以可行的方式表现在费米子行列式中,也表现在解决U(1)问题所需的赝标介子传播子的断开部分中。此外,如果无根的混合费米子作用量理论也是如此,那么我们的有根理论在量子色动力学中被证明是正确的普适性类。

英文摘要:

To investigate the viability of the 4th root trick for the staggered fermion determinant in a simpler setting, we consider a two taste (flavor) lattice fermion formulation with no taste mixing but with exact taste-nonsinglet chiral symmetries analogous to the taste-nonsinglet $U(1)_A$ symmetry of staggered fermions. M. Creutz's objections to the rooting trick apply just as much in this setting. To counter them we show that the formulation has robust would-be zero-modes in topologically nontrivial gauge backgrounds, and that these manifest themselves in a viable way in the rooted fermion determinant and also in the disconnected piece of the pseudoscalar meson propagator as required to solve the U(1) problem. Also, our rooted theory is heuristically seen to be in the right universality class for QCD if the same is true for an unrooted mixed fermion action theory.

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