88 citations · 1.1k across the 91 of their papers we have counts for
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Modular symmetry in the SMEFT
Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto +1
We study the modular symmetric standard-model effective field theory. We employ the stringy Ansatz on coupling structure that 4-point couplings of matter fields are writt…
On Stringy Origin of Minimal Flavor Violation
Tatsuo Kobayashi, Hajime Otsuka
We study the minimal flavor violation in the context of string effective field theory. Stringy selection rules indicate that -point couplings among fermionic zero-modes and ligh…
Symplectic modular symmetry in heterotic string vacua: flavor, CP, and -symmetries
Keiya Ishiguro, Tatsuo Kobayashi, Hajime Otsuka
We examine a common origin of four-dimensional flavor, CP, and symmetries in the context of heterotic string theory with standard embedding. We find that flavor and $U(1)_…
Sharpening the Boundaries Between Flux Landscape and Swampland by Tadpole Charge
Keiya Ishiguro, Hajime Otsuka
We investigate the vacuum structure of four-dimensional effective theory arising from Type IIB flux compactifications on a mirror of the rigid Calabi-Yau threefold, corresponding t…
Hierarchical structure of physical Yukawa couplings from matter field Kähler metric
Keiya Ishiguro, Tatsuo Kobayashi, Hajime Otsuka
We study the impacts of matter field Kähler metric on physical Yukawa couplings in string compactifications. Since the Kähler metric is non-trivial in general, the kinetic mixing o…
Small flux superpotential in F-theory compactifications
Yoshinori Honma, Hajime Otsuka
We investigate whether a class of models describing F-theory compactifications admits a specific type of flux vacua with an exponentially small vacuum expectation value of the supe…