约化 Kähler-Dirac 费米子的格点正则化及其与手征费米子的联系
Lattice Regularization of Reduced Kähler-Dirac Fermions and Connections to Chiral Fermions
AI总结:
针对约化 Kähler-Dirac 费米子路径积分的测度相位模糊问题,提出利用镜像费米子构建唯一的规范不变测度,并通过引入满足 't Hooft 反常消除的 Yukawa 相互作用使镜像退耦,其最小模型在连续极限下对应 Pati-Salam GUT 模型。
摘要:
我们展示了约化 Kähler-Dirac 费米子的路径积分如何面临与费米子测度相关的相位模糊问题,该问题是手征费米子测度问题的类比。然而,与手征对称性情况不同,存在一个无 doubler 的格点作用量,它在该相应的在位对称性下保持不变。这使得能够利用镜像费米子对该问题进行明确的诊断和求解,从而得到唯一的规范不变测度。通过引入一组与 't Hooft 反常消除相一致的适当 Yukawa 相互作用,我们推测这些镜像费米子可以从低能物理中退耦。此外,此类最小的 Kähler-Dirac 镜像模型产生了一个轻扇区,在平坦空间连续极限下,它对应于 Pati-Salam GUT 模型。
英文摘要:
We show how a path integral for reduced Kähler-Dirac fermions suffers from a phase ambiguity associated with the fermion measure that is an analog of the measure problem seen for chiral fermions. However, unlike the case of chiral symmetry, a doubler free lattice action exists which is invariant under the corresponding onsite symmetry. This allows for a clear diagnosis and solution to the problem using mirror fermions resulting in a unique gauge invariant measure. By introducing an appropriate set of Yukawa interactions which are consistent with 't Hooft anomaly cancellation we conjecture the mirrors can be decoupled from low energy physics. Moreover, the minimal such Kähler-Dirac mirror model yields a light sector which corresponds, in the flat space continuum limit, to the Pati-Salam GUT model.
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