Journal
PHYSICS LETTERS B
Volume 808, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2020.135615
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Funding
- DGAPA-PAPIIT [IN100217]
- Deutsche Forschungsgemeinschaft [SFB1258]
- TUM August-Wilhelm Scheer Program
- CONACYT [F-252167, 278017]
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In a consistent top-down approach based on orbifold compactifications, modular and traditional flavor symmetries combine nontrivially to the so-called eclectic flavor symmetry. We extend this scheme from two extra dimensions, discussed previously, to the six extra dimensions of string theory. By doing so, new insights on the nature of CP and its spontaneous breaking emerge. Moreover, we identify a new interpretation of R-symmetries as unbroken remnants from modular symmetries that are associated with geometrically stabilized complex structure moduli. Hence, all symmetries (i.e. modular, traditional flavor, CP and R) share a common origin in string theory: on a technical level, they are given by outer automorphisms of the Narain space group. The eclectic top-down approach leads to a very restrictive scheme with high predictive power. It remains a challenge to connect this with existing bottom-up constructions of modular flavor symmetry. (C) 2020 The Author(s). Published by Elsevier B.V.
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