## KOBAYASHI Tatsuo

Professor

### Challenge the mystery of the universe and the world of elementary particles

Department of Physics, Nonlinear Physics

Field | particle physics, cosmology |

Keyword | superstring theory, standard model of particle physics, cosmology, compact space |

#### Introduction of Research

Superstring theory is a good candidate for a unified theory of all interactions including gravity, and quarks and leptons as well as the Higgs particle. We study particle physics and cosmology, which can derived from superstring theory. Superstring theory predicts six-dimensional space, which must be compact, in addition to our four-dimensional spacetime. Geometrical aspects of compact space determine which type of particle appears and their properties. We study superstring theory on compact space, which realizes our world and derive their predictions.

#### Representative Achievements

''Z(n) Orbifold Models,''

Nucl. Phys. B 341, 611 (1990).

''Searching for realistic 4d string models with a Pati-Salam symmetry: Orbifold grand unified theories from heterotic string compactification on a Z(6) orbifold,''

Nucl. Phys. B 704, 3 (2005)

''Little SUSY hierarchy in mixed modulus-anomaly mediation,''

Phys. Lett. B 633, 355 (2006)

''Stringy origin of non-Abelian discrete flavor symmetries,''

Nucl. Phys. B 768, 135 (2007)

''Non-Abelian Discrete Symmetries in Particle Physics,''

Prog. Theor. Phys. Suppl. 183, 1 (2010)