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arXiv 2101.08718hep-phhep-th
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$τ= i$周围的模不变动力学和费米子质量等级

Modular Invariant Dynamics and Fermion Mass Hierarchies around $τ= i$

Ferruccio Feruglio, Valerio Gherardi, Andrea Romanino, Arsenii Titov

摘要:

我们讨论费米子质量层次内模块不变的味道模型。我们分析了自对偶点$τ=i$的邻域,其中模块不变理论具有剩余$Z_4$不变性。在这一区域,$Z_4$的断裂可以完全用自旋$ε\approx τ- i$来描述,它将其符号翻转到$Z_4$下面。费米子质量矩阵的简并或消失的本征值,迫使在$τ=i$的$Z_4$对称性,被删除稍微偏离自对偶点。相关质量比由$|ε|$的幂控制。我们提出的例子中,这种机制是一个关键因素,成功地实现了层次光谱的轻子部门,即使在存在的非最小凯勒潜力。

英文摘要:

We discuss fermion mass hierarchies within modular invariant flavour models. We analyse the neighbourhood of the self-dual point $τ=i$, where modular invariant theories possess a residual $Z_4$ invariance. In this region the breaking of $Z_4$ can be fully described by the spurion $ε\approx τ- i$, that flips its sign under $Z_4$. Degeneracies or vanishing eigenvalues of fermion mass matrices, forced by the $Z_4$ symmetry at $τ=i$, are removed by slightly deviating from the self-dual point. Relevant mass ratios are controlled by powers of $|ε|$. We present examples where this mechanism is a key ingredient to successfully implement an hierarchical spectrum in the lepton sector, even in the presence of a non-minimal Kähler potential.

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