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updated in October, 2021.

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Research Interests

My research papers in the last several years are concerned about
string duality, mathematics seen through the glasses of string theory, and
particle-physics applications of string theory (non-perturbabtive aspects
in hadron high-energy scattering, unified theory, and inflation).

In the following, links are provided to (the abstracts and
pdf copies of) some of my papers that reflect my taste in science well.

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My recent research interests are in these subjects

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A series of papers under the theme of "Elementary Particle Physics
after the Revolution of String Duality"

my first paper:
Proton Decay, Yukawa Couplings and Underlying Gauge Symmetry in String Theory (Feb/06) with Radu Tatar

on F-theory:

New Aspects of Heterotic--F Theory Duality (May/08)
with Hirotaka Hayashi, Radu Tatar, Yukinobu Toda and Masahito Yamazaki

Codimension-3 Singularities and Yukawa Couplings in F-theory
(Jan/09) with Hirotaka Hayashi, Teruhiko Kawano, Radu Tatar

on the generation structure of elementary particles

Right-handed Neutrinos in F-theory Compactifications
(May/09) coauthor: Radu Tatar, Yoichi Tsuchiya

Flavor Structure in F-theory Compactifications
(Oct/09) coauthor: H. Hayashi, T. Kawano, Y.suchiya

on the statistics of vacua of string theory:
Statistics of Flux Vacua for Particle Physics (June/15)

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A study of hadron high-energy scattering using holography

Skewness Dependence of GPD, Conformal OPE and AdS/CFT Correspondence
(Aug/14) coauthor: Ryoichi Nishio

High-Energy Photon--Hadron Scattering in Holographic QCD (May/11) with Ryoichi Nishio

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Works with a little more mathematical taste

On the Classification of Elliptic Fibrations modulo Isomorphism
on K3 Surfaces with Large Picard Number
(Dec/13) coauthor: Andreas Braun and Yusuke Kimura

The Vertical, the horizontal and the rest:--anatomy of the middle cohomology of Calabi--Yau foufolds and F-theory applications-- (Aug/14) with Andreas Braun

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On Inflation and Dark Energy

Supergravity Analysis of Hybrid Inflation Model from D3--D7 System
(Nov/03) coauthor: Fumikazu Koyama, Yuji Tachikawa@

Density Perturbations and the Cosmological Constant from Inflationary
Landscapes
(June/05) coauthor: Brian Feldstein, Lawrence Hall

Revisiting Arithmetic Solutions to the W=0 Condition
(May/17) coauthor: Keita Kanno