标题： 动态肥链费米子 显示英文标题

标题： Dynamical fat link fermions

摘要： 在费米子作用中使用APE平滑或其他阻塞技术可以带来许多优势。 目前在格点QCD中存在许多这类肥链作用的形式，例如FLIC费米子。 通常，肥链作用会结合使用APE阻塞技术，并将阻塞后的链接投影回特殊酉群。 这种重新酉化通常通过迭代最大化一个规范不变的度量来实现。 这种技术相对于规范场是不可微的，因此阻止了标准混合蒙特卡洛模拟算法的使用。 使用另一种投影技术可以绕过这一困难，并允许使用标准HMC及其变体来模拟动态肥链费米子。 显示英文摘要

摘要： The use of APE smearing or other blocking techniques in fermion actions can provide many advantages. There are many variants of these fat link actions in lattice QCD currently, such as FLIC fermions. Frequently, fat link actions make use of the APE blocking technique in combination with a projection of the blocked links back into the special unitary group. This reunitarisation is often performed using an iterative maximisation of a gauge invariant measure. This technique is not differentiable with respect to the gauge field and thus prevents the use of standard Hybrid Monte Carlo simulation algorithms. The use of an alternative projection technique circumvents this difficulty and allows the simulation of dynamical fat link fermions with standard HMC and its variants.