KOBAYASHI Tatsuo

J-GLOBAL         Last updated: Oct 22, 2018 at 11:38
 
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Name
KOBAYASHI Tatsuo
Affiliation
Hokkaido University
Section
Graduate School of ScienceDivision of Physics and Astronomy
Degree
Ph. D, Master of Science(Kanazawa University)

Research Interests

 
 

Education

 
 
 - 
1991
Graduate School, Division of National Science and Technology, Kanazawa University
 
 
 - 
1986
Faculty of Science, Saitama University
 

Published Papers

 
KOBAYASHI Tatsuo
Phys. Rev.   D89    2014   [Refereed]
KOBAYASHI Tatsuo
JHEP   1405    2014   [Refereed]
KOBAYASHI Tatsuo
JHEP   1404    2014   [Refereed]
KOBAYASHI Tatsuo
JHEP   1402    2014   [Refereed]
KOBAYASHI Tatsuo
JHEP   1401    2014   [Refereed]
   2013   [Refereed]
   2013   [Refereed]
   2013   [Refereed]

Misc

 
Junichiro Kawamura, Tatsuo Kobayashi, Natsumi Nagata
   Aug 2018
The Next-to-Minimal Supersymmetric Standard Model (NMSSM) provides a natural
framework to realize a low-scale supersymmetric (SUSY) model, where a singlet
superfield is added to the minimal model to generate a SUSY-scale higgsino mass
term with it...
Tatsuo Kobayashi, Naoya Omoto, Yusuke Shimizu, Kenta Takagi, Morimitsu Tanimoto, Takuya H. Tatsuishi
   Aug 2018
We study the phenomenological implications of the modular symmetry Tex of lepton flavors facing recent experimental data of neutrino
oscillations. The mass matrices of neutrinos and charged leptons are
essentially given by fixin...
Tatsuo Kobayashi, Takaaki Nomura, Hiroshi Okada
Phys. Rev. D 98, 055025 (2018)      May 2018
We investigate origins of predictive one-zero neutrino mass textures in a
systematic way. Here we search Abelian continuous(discrete) global symmetries,
and non-Abelian discrete symmetries, and show how to realize these neutrino
masses. Then we pr...
Tatsuo Kobayashi, Satoshi Nagamoto, Shintaro Takada, Shio Tamba, Takuya H. Tatsuishi
Phys. Rev. D 97, 116002 (2018)      Apr 2018
We study the modular symmetry in magnetized D-brane models on Tex.
Non-Abelian flavor symmetry Tex in the model with magnetic flux Tex (in a
certain unit) is a subgroup of the modular symmetry. We also study the modular
symmetry in heterotic...
Tatsuo Kobayashi, Naoya Omoto, Hajime Otsuka, Takuya H. Tatsuishi
Phys. Rev. D 97, 106006 (2018)      Nov 2017
We propose a new type of Kähler moduli stabilization mechanisms in type IIB
superstring theory on Calabi-Yau manifolds with the positive Euler number. The
overall Kähler modulus can be perturbatively stabilized by radiative
corrections due to ...
Kenji Kadota, Tatsuo Kobayashi, Akane Oikawa, Naoya Omoto, Hajime Otsuka, Takuya H. Tatsuishi
   Jun 2016
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 ...
Hiroyuki Abe, Tatsuo Kobayashi, Hajime Otsuka, Yasufumi Takano, Takuya H. Tatsuishi
Phys. Rev. D 94, 126020 (2016)      May 2016
We study the flavor structure in Tex heterotic string theory on
six-dimensional torus with magnetic fluxes. In particular, we focus on models
with the flavor symmetries Tex and Tex. In both models, we can
realize the realistic ...
Kei Hagimoto, Tatsuo Kobayashi, Hiroki Makino, Ken-ichi Okumura, Takashi Shimomura
   Sep 2015
We study the next-to-minimal supersymmetric standard model (NMSSM) with the
TeV scale mirage mediation, which is known as a solution for the little
hierarchy problem in supersymmetry. Our previous study showed that 125 GeV
Higgs boson is realized ...
Tomo-hiro Abe, Yukihiro Fujimoto, Tatsuo Kobayashi, Takashi Miura, Kenji Nishiwaki, Makoto Sakamoto, Yoshiyuki Tatsuta
Nucl.Phys. B894 (2015) 374-406      Jan 2015
We classify the combinations of parameters which lead three generations of
quarks and leptons in the framework of magnetized twisted orbifolds on
Tex, Tex, Tex and Tex with allowing nonzero discretized
Wilson line phases an...
Yuta Hamada, Tatsuo Kobayashi, Atsushi Ogasahara, Yuji Omura, Fumihiro Takayama, Daiki Yasuhara
JHEP10(2014)183      May 2014
We revisit the discrete dark matter model with Tex flavor symmetry
originally introduced by M.Hirsch {\it et.al}. We show that radiative
corrections can lead to non-zero Tex and non-zero mass for the
lightest neutrino. We find an inter...
Tatsuo Kobayashi, Naoya Omoto, Hajime Otsuka, Takuya H. Tatsuishi
Phys. Rev. D 96, 046004 (2017)      Apr 2017
We propose a new type of moduli stabilization scenario where the
supersymmetric and supersymmetry-breaking minima are degenerate at the leading
level. The inclusion of the loop-corrections originating from the matter fields
resolves this degenerac...
Hiroyuki Abe, Tatsuo Kobayashi, Keigo Sumita, Shohei Uemura
Phys. Rev. D 96, 026019 (2017)      Mar 2017
We study Kähler moduli stabilizations in semi-realistic magnetized D-brane
models based on Tex toroidal orbifolds. In type IIB
compactifications, 3-form fluxes can stabilize the dilaton and complex
structure moduli fields, but ther...
Tatsuo Kobayashi, Akane Oikawa, Naoya Omoto, Hajime Otsuka, Ikumi Saga
Phys. Rev. D 95, 063514 (2017)      Sep 2016
We study general class of small-field axion inflations which are the mixture
of polynomial and sinusoidal functions suggested by the natural and axion
monodromy inflations. The axion decay constants leading to the successful axion
inflations are s...
Yukihiro Fujimoto, Tatsuo Kobayashi, Kenji Nishiwaki, Makoto Sakamoto, Yoshiyuki Tatsuta
Phys. Rev. D 94, 035031 (2016)      May 2016
Based on the result of classification in our previous work, we exhaustively
investigate Yukawa sector of Tex model on magnetized orbifolds
Tex, Tex, Tex and Tex by evaluating
ratios of the mass eigenvalue...
Kensuke Akita, Tatsuo Kobayashi, Akane Oikawa, Hajime Otsuka
   Mar 2016
We study the moduli-induced gravitino problem within the framework of the
phenomenologically attractive mirage mediations. The huge amount of gravitino
generated by the moduli decay can be successfully diluted by introducing an
extra light modulus...
Hironori Hattori, Tatsuo Kobayashi, Naoya Omoto, Osamu Seto
Phys. Rev. D 92, 103518 (2015)      Oct 2015
We consider domain walls in the Tex symmetric NMSSM. The spontaneous Tex
discrete symmetry breaking produces domain walls, and the stable domain walls
are problematic. Thus, we assume the Tex symmetry is slightly but explicitly
broken and th...
Hiroyuki Abe, Tatsuo Kobayashi, Hajime Otsuka, Yasufumi Takano, Takuya H. Tatsuishi
   Jul 2015
We study Tex heterotic string theory on torus with magnetic fluxes.
Non-vanishing fluxes can lead to non-universal gauge kinetic functions for
Tex which is the important features of Tex
heterotic string the...
Tomo-hiro Abe, Yukihiro Fujimoto, Tatsuo Kobayashi, Takashi Miura, Kenji Nishiwaki, Makoto Sakamoto
   Sep 2014
We discuss an effective way for analyzing the system on the magnetized
twisted orbifolds in operator formalism, especially in the complicated cases
Tex, Tex and Tex. We can obtain the exact and
analytical results whic...
Hiroyuki Abe, Tatsuo Kobayashi, Keigo Sumita, Yoshiyuki Tatsuta
Phys. Rev. D 90, 105006 (2014)      May 2014
We study the structure of Yukawa matrices derived from the supersymmetric
Yang-Mills theory on magnetized orbifolds, which can realize the observed quark
and charged lepton mass ratios as well as the CKM mixing angles, even with a
small number of ...
Tatsuo Kobayashi, Kentaro Tanaka, Takuya H. Tatsuishi
Phys. Rev. D 98, 016004 (2018)      Mar 2018
We study the lepton flavor models, whose flavor symmetries are finite
subgroups of the modular group such as Tex and Tex. In our models,
couplings are also nontrivial representations of these groups and modular
functions of the modulus. We stu...

Books etc

 
Ishimori Hajime, Kobayashi Tatsuo, Ohki Hiroshi, Okada Hiroshi, Shimizu Yusuke, Tanimoto Morimitsu
Springer-Verlag   2012   ISBN:9783642308048
Yukawa International Symposium, 小林 達夫, Kugo Taichi
Progress of Theoretical Physics   2009   

Research Grants & Projects

 
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2008 - 2011    Investigator(s): Tatsuo KOBAYASHI
We have studied four-dimensional low-energy effective field theory, derived from superstring theory, in particular heterotic string theory on the orbifolds and magnetized/intersecting brane models. We have studied Abelian and non-Abelian discrete ...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2005 - 2007    Investigator(s): Tatsuo KOBAYASHI
The purpose of this research is to clarify which flavor structures can be derived from superstring theory and to study their phenomenological implications.Recently, several discrete non-Abelian flavor symmetries were proposed to derive realistic m...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2002 - 2003    Investigator(s): Tatsuo KOBAYASHI
Understanding the origin of fermion masses and mixing angles is one of important issues in particle physics. Within the framework of supersymmetric models, a mechanism to lead to realistic Yukawa matrices, in general, affects sfermion masses as we...
Supersymmetry Breaking and Superstring Phenomenology