Hajime Otsuka

activity

20112026

most citedModular symmetry by orbifolding magnetized

T^{2} \times T^{2}

: realization of double cover of

Γ_{N}

88 citations · 1.1k across the 91 of their papers we have counts for

collaborators

Showing 2020Show all

7 papers · 1 filter

hep-ph2020★ 88 cited

Landscape of Modular Symmetric Flavor Models

Keiya Ishiguro, Tatsuo Kobayashi, Hajime Otsuka

We study the moduli stabilization from the viewpoint of modular flavor symmetries. We systematically analyze stabilized moduli values in possible configurations of flux compactific…

hep-th2020★ 54 cited

Spontaneous CP violation and symplectic modular symmetry in Calabi-Yau compactifications

Keiya Ishiguro, Tatsuo Kobayashi, Hajime Otsuka

We explore the geometrical origin of CP and the spontaneous CP violation in Calabi-Yau compactifications. We find that the CP symmetry is identified with an outer automorphism of t…

hep-th2020★ 88 cited

Modular symmetry by orbifolding magnetized $T^{2} \times T^{2}$ : realization of double cover of $Γ_{N}$

Shota Kikuchi, Tatsuo Kobayashi, Hajime Otsuka +2

We study the modular symmetry of zero-modes on $T_{1}^{2} \times T_{2}^{2}$ and orbifold compactifications with magnetic fluxes, $M_{1}, M_{2}$ , where modulus parameters are identified. This id…

hep-th2020★ 49 cited

Challenge for spontaneous CP violation in Type IIB orientifolds with fluxes

Tatsuo Kobayashi, Hajime Otsuka

We systematically investigate possibilities of realizing the spontaneous CP violation in Type IIB flux compactifications on toroidal orientifolds. Our detailed analysis leads to th…

hep-th2020★ 24 cited

Deep learning and k-means clustering in heterotic string vacua with line bundles

Hajime Otsuka, Kenta Takemoto

We apply deep-learning techniques to the string landscape, in particular, $S O (32)$ heterotic string theory on simply-connected Calabi-Yau threefolds with line bundles. It turns out…

hep-ph2020★ 10 cited

Common origin of the strong CP and CKM phases in string compactifications

Tatsuo Kobayashi, Hajime Otsuka

We explore the scenario where both the strong CP and Cabbibo-Kobayashi-Maskawa (CKM) phases are determined by the same axion field. Such a scenario is naturally realized in string…

hep-th2020★ 51 cited

Classification of discrete modular symmetries in Type IIB flux vacua

Tatsuo Kobayashi, Hajime Otsuka

We classify discrete modular symmetries in the effective action of Type IIB string on toroidal orientifolds with three-form fluxes, emphasizing on $T^{6} / Z_{2}$ and $T^6/(\mat…

Landscape of Modular Symmetric Flavor Models

Spontaneous CP violation and symplectic modular symmetry in Calabi-Yau compactifications

Modular symmetry by orbifolding magnetized T2×T2: realization of double cover of ΓN​

Challenge for spontaneous CP violation in Type IIB orientifolds with fluxes

Deep learning and k-means clustering in heterotic string vacua with line bundles

Common origin of the strong CP and CKM phases in string compactifications

Classification of discrete modular symmetries in Type IIB flux vacua

Modular symmetry by orbifolding magnetized $T^{2} \times T^{2}$ : realization of double cover of $Γ_{N}$