Takuya H. Tatsuishi

Gauge coupling unification in SO(32) heterotic string theory with magnetic fluxes

Gauge coupling unification in SO(32) heterotic string theory with magnetic fluxes Hiroyuki Abe1, Tatsuo Kobayashi2,∗, Hajime Otsuka1,∗, Yasufumi Takano2,∗, and Takuya H. Tatsuishi2 1Department of Physics, Waseda University, Tokyo 169-8555, Japan 2Department of Physics, Hokkaido University, Sapporo 060-0810, Japan ∗E-mail: kobayashi@particle.sci.hokudai.ac.jp, h.otsuka@aoni.waseda.jp, takano@particle.sci.hokudai.ac.jp

Small field axion inflation with sub-Planckian decay constant

We study an axion inflation model recently proposed within the framework of type IIB superstring theory, where we pay a particular attention to a sub-Planckian axion decay constant. Our axion potential can lead to the small field inflation with a small tensor-to-scalar ratio, and a typical reheating temperature can be as low as GeV.

Modular symmetry and non-Abelian discrete flavor symmetries in string compactification

We study the modular symmetry in magnetized D-brane models on

Flavor structure in SO(32) heterotic string theory

T^2

Toward pole inflation and attractors in supergravity : Chiral matter field inflation

. Non-Abelian flavor symmetry

Supersymmetry preserving and breaking degenerate vacua, and radiative moduli stabilization

D_4

Radiative Kähler moduli stabilization RADIATIVE KÄHLER MODULI STABILIZATION KOBAYASHI et al.

in the model with magnetic flux

Modular

M=2

A_4

(in a certain unit) is a subgroup of the modular symmetry. We also study the modular symmetry in heterotic orbifold models. The

invariance and neutrino mixing

T^2/Z_4