A general classification of flavor symmetries is provided according to their interplay with the proper Poincaré and gauge groups and to their linear or nonlinear action in field space. The focus is on the lepton sector, and the different types of symmetries describing neutrino masses and the lepton mixing matrix are reviewed. Several illustrative examples are presented for each type of symmetry, and specific strengths and limitations are discussed.

中文翻译：

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轻子的风味对称性

根据风味对称性与适当的庞加莱和规规组之间的相互作用以及它们在田间空间中的线性或非线性作用，可以对风味对称性进行一般分类。重点是轻子领域，并综述了描述中微子质量和轻子混合矩阵的不同类型的对称性。针对每种类型的对称性提供了几个说明性示例，并讨论了特定的优势和局限性。