J-GLOBAL         Last updated: Nov 26, 2019 at 21:19
High Energy Accelerator Research Organization

Research Interests


Research Areas



Graduate School, Division of Science, The University of Tokyo

Published Papers

Unitary matrix with a Penner-like potential also yields Nf=2
Shun'ya Mizoguchi, Hajime Otsuka, Hitomi Tashiro
Pays.Lett.B 掲載決定      Nov 2019   [Refereed]
A dessin on the base: a description of mutually non-local 7-branes without using branch cuts
Shin Fukuchi, Naoto Kan, Shun'ya Mizoguchi, Hitomi Tashiro
Pays.Rev.D 掲載決定      Dec 2019   [Refereed]
Non-Cartan Mordell-Weil lattices of rational elliptic surfaces and heterotic/F-theory compactifications
Shun'ya Mizoguchi, Taro Tani
JHEP   1903 121   Aug 2018   [Refereed]
On an Algebraic Structure of Dimensionally Reduced Magical Supergravity Theories
Shin Fukuchi, Shun'ya Mizoguchi
Phys.Lett.   B(781) 77-82   Jun 2018   [Refereed]
Enhancements in F-theory models on moduli spaces of K3 surfaces with ADE rank 17
Yusuke Kimura, Shun'ya Mizoguchi
PTEP   2018(no.4, 043B05) 1-22   Apr 2018   [Refereed]
Looijenga's weighted projective space, Tate's algorithm and Mordell-Weil Lattice in F-theory and heterotic string theory
Shun'ya Mizoguchi, Taro Tani
JHEP   1611(053) 1-21   Nov 2016   [Refereed]
Naoto Kan, Shun'ya Mizoguchi
Phys.Lett.   B(762) 177-183   Oct 2016   [Refereed]
Shun'ya Mizoguchi, Tomoki Sakaguchi
PTEP   2016(no.10, 101B01) 1-8   Oct 2016   [Refereed]
Shun'ya Mizoguchi, Taro Tani
PTEP   2016(no.7 073B05) 1-27   Jul 2016   [Refereed]
Shun'ya Mizoguchi
   Jul 2014
We show that a special type of colliding 7-brane configuration of a
codimension-two singularity realizes not only a six-dimensional spectrum with
exactly the same quantum numbers as that of the three-generation E7/(SU(5) x
U(1)^3) coset family uni...
Kazuki Hinoue, Shun'ya Mizoguchi, Yukinori Yasui
Phys.Rev.   D90(10) 106009   Jun 2014   [Refereed]
A supersymmetric solution to type II supergravity is constructed by
superposing two hyperkähler with torsion metrics. The solution is given by a
Käler with torsion metric with Tex holonomy. The metric is embedded into
a heterotic solution ...
F-theory Family Unification
Shun'ya Mizoguchi
JHEP   1407(018) 1-39   May 2014   [Refereed]
We propose a new geometric mechanism for naturally realizing unparallel three families of flavors in string theory, using the framework of F-theory. We consider a set of coalesced local 7-branes of a particular Kodaira singularity type and allow s...
Shun'ya Mizoguchi, Masaya Yata
PTEP   2013(5) 053B01   Nov 2012   [Refereed]
Some of the supersymmetric nonlinear sigma models on exceptional groups (E7
or E8) are known to yield almost minimal necessary content of matter fields for
phenomenological model building, including three chiral families and a Higgs
multiplet. We ...
Shinya Tomizawa, Shun'ya Mizoguchi
Phys.Rev.   D87 024027   Oct 2012   [Refereed]
Using the SL(2,R)-duality in a dimensionally reduced spacetime in (the
bosonic sector of) five-dimensional minimal supergravity, we construct general
Kaluza-Klein black hole solutions which carry six independent charges, its
mass, angular momentum...
Shun'ya Mizoguchi, Shinya Tomizawa
Phys.Rev.   D86 024022   Jan 2012   [Refereed]
The dimensional reduction of the bosonic sector of five-dimensional minimal
supergravity to a Lorentzian four-dimensional spacetime leads to a theory with
a massless axion and a dilaton coupled to gravity and two U(1) gauge fields and
the dimensio...
Harunobu Imazato, Shun'ya Mizoguchi, Masaya Yata
   Jul 2011
We consider the Gibbons-Hawking metric for a three-dimensional periodic array
of multi-Taub-NUT centers, containing not only centers with a positive NUT
charge but also ones with a negative NUT charge. The latter are regarded as
representing the a...
Shun'ya Mizoguchi, Shinya Tomizawa
   Jun 2011
The dimensional reduction of (the bosonic sector of) five-dimensional minimal
supergravity to four dimensions leads to a theory with a massless axion and a
dilaton coupled to gravity and two U(1) gauge fields (one of which has
Chern-Simons couplin...
Harunobu Imazato, Shun'ya Mizoguchi, Masaya Yata
Mod.Phys.Lett.A26:1453-1457,2011      Oct 2010
We show that the gauge, gravitational (tangent-bundle) and their mixed
anomalies arising from the localized modes near a 5-brane in the SO(32)
heterotic string theory cancel with the anomaly inflow from the bulk with the
use of the Green-Schwarz m...
Tetsuji Kimura, Shun'ya Mizoguchi
JHEP   1004 028   Dec 2009
We show that there exist two 27 and one 27 bar of E6, net one D=4, N=1 chiral
matter supermultiplet as zero modes localized on the intersection of two
5-branes in the E8 x E8 heterotic string theory. The smeared intersecting
5-brane solution is us...
Tetsuji Kimura, Shun'ya Mizoguchi
   May 2009
We show that there exist two 27 and one 27bar of E6, net one chiral
supermultiplet as zero modes localized on the intersecting 5-branes in the E8 x
E8 heterotic string theory. A heterotic background is constructed by the
standard embedding in the ...
Shun'ya Mizoguchi
   Aug 2008
We consider type II and heterotic string compactifications on an isolated
singularity in the noncompact Gepner model approach. The conifold-type ADE
noncompact Calabi-Yau threefolds, as well as the ALE twofolds, are modeled by a
tensor product of ...
Shun'ya Mizoguchi
Phys.Lett.B669:352-356,2008      Nov 2007
We construct spacetime supersymmetric, modular invariant partition functions
of strings on the conifold-type singularities which include contributions from
the discrete-series representations of SL(2, R). The discrete spectrum is
automatically con...
H. Kunitomo, S. Mizoguchi
Prog.Theor.Phys.118:559-576,2007      Jun 2007
We study the Lorentz invariance of D=4 and 6 superstrings in the
double-spinor formalism, which are equivalent to the D=4 and 6 superstrings in
the pure-spinor formalism in the sense of the BRST cohomology. We first
re-examine how the conformal an...
Hiroshi Kunitomo, Shun'ya Mizoguchi
Prog.Theor.Phys.117:765-793,2007      Dec 2006
We study lower-dimensional superstrings in the double-spinor formalism
introduced by Aisaka and Kazama. These superstrings can be consistently
quantized and are equivalent to the lower-dimensional pure-spinor superstrings
proposed by Grassi and Wy...
Yoshihisa Kitazawa, Shun'ya Mizoguchi, Osamu Saito
Phys.Rev.D75:106002,2007      Dec 2006
We report on progress in determining the complete form of vertex operators
for the IIB matrix model. The exact expressions are obtained for those emitting
massless IIB supergravity fields up to sixth order in the light-cone
superfield, in which th...
Yoshihisa Kitazawa, Shun'ya Mizoguchi, Osamu Saito
Phys.Rev.D74:046003,2006      Mar 2006
We study the zero-dimensional reduced model of D=6 pure super Yang-Mills
theory and argue that the large N limit describes the (2,0) Little String
Theory. The one-loop effective action shows that the force exerted between two
diagonal blocks of ma...
Machiko Hatsuda, Shun'ya Mizoguchi
JHEP0607:029,2006      Mar 2006
We obtain sets of infinite number of conserved nonlocal charges of strings in
a flat space and pp-wave backgrounds, and compare them before and after
T-duality transformation. In the flat background the set of nonlocal charges is
the same before a...
Shun'ya Mizoguchi, Kenji Mohri, Yasuhiko Yamada
Class.Quant.Grav.23:3181-3194,2006      Dec 2005
Motivated by the recent analysis of the E10 sigma model for the study of M
theory, we study a one-dimensional sigma model associated with the hyperbolic
Kac-Moody algebra G2H and its link to D=5, N=2 pure supergravity, which closely
resembles in m...
Shun'ya Mizoguchi
Nucl.Phys. B716 (2005) 462-486      Nov 2004
Unitary 1-matrix models are shown to be exactly equivalent to hermitian
1-matrix models coupled to 2N vectors with appropriate potentials, to all
orders in the 1/N expansion. This fact allows us to use all the techniques
developed and results obta...
Hiroyuki Fuji, Shun'ya Mizoguchi
Nucl.Phys. B698 (2004) 53-91      May 2004
We study the gravitational corrections to the F-term in four-dimensional N=1
U(N) gauge theories with flavors, using the Dijkgraaf-Vafa theory. We derive a
compact formula for the annulus contribution in terms of the prime form on the
matrix model...
Hiroyuki Fuji, Shun'ya Mizoguchi
Phys.Lett. B578 (2004) 432-442      Sep 2003
A hermitian one-matrix model with an even quartic potential exhibits a
third-order phase transition when the cuts of the matrix model curve coalesce.
We use the known solutions of this matrix model to compute effective
superpotentials of an N=1, S...
Shun'ya Mizoguchi, Takeshi Mogami, Yuji Satoh
Phys.Lett. B564 (2003) 132-142      Feb 2003
We show, by direct computations of bosonic string spectra, the O(d,d;Z)
(d=1,2) T-duality in the maximally supersymmetric IIB plane-wave background
compactified on S^1 and T^2. Only half of the ordinary set of zero modes appear
in the Hamiltonian....
Shun'ya Mizoguchi, Takeshi Mogami, Yuji Satoh
Class.Quant.Grav. 20 (2003) 1489-1502      Sep 2002
We discuss the Green-Schwarz action for type IIB strings in general
plane-wave backgrounds obtained as Penrose limits from any IIB supergravity
solutions with vanishing background fermions. Using the normal-coordinate
expansion in superspace, we p...
Shun'ya Mizoguchi, Yasuhiko Yamada
Phys.Lett. B537 (2002) 130-140      Feb 2002
The Weyl group symmetry W(E_k) is studied from the points of view of the
E-strings, Painleve equations and U-duality. We give a simple reformulation of
the elliptic Painleve equation in such a way that the hidden symmetry W(E_10)
is manifestly rea...
Shun'ya Mizoguchi
Phys.Lett. B523 (2001) 351-356      Sep 2001
We examine whether any type II asymmetric orbifolds have the same massless
spectrum as the dimensional reduction of D=5 simple supergravity, which,
besides the eleven-dimensional supergravity, is the only known supergravity
above four dimensions w...
Shun'ya Mizoguchi, Taro Tani
Nucl.Phys. B611 (2001) 253-280      May 2001
We propose a new prescription of how to represent D-branes in Gepner models
in more general homology classes than those in the previous constructions. The
central role is played by a certain projection acting on the
Recknagel-Schomerus boundary st...
Shun'ya Mizoguchi
   Sep 2000
We construct modular invariant partition functions for type II strings on a
conifold and a singular Eguchi-Hanson instanton by means of the SL(2,R)/U(1)
version of Gepner models. In the conifold case, we find an extra massless
hypermultiplet in th...
Shun'ya Mizoguchi
JHEP 0004:014,2000      Mar 2000
Extending the seminal work of Bilal and Gervais, we construct a tachyon-free,
modular invariant partition function for critical superstrings on
four-dimensional Minkowski x two-dimensional black hole. This model may be
thought of as an SL(2,R)/U(1...
Shun'ya Mizoguchi, Germar Schroeder
Class.Quant.Grav. 17 (2000) 835-870      Sep 1999
We give a complete set of generators for the discrete exceptional U-duality
groups of toroidal compactified type II theory and M-theory in d>2. For this,
we use the DSZ quantization in d=4 as originally proposed by Hull and Townsend,
and determine...
S. Mizoguchi, N. Ohta
Phys.Lett. B441 (1998) 123-132      Jul 1998
It has been known that D=5 simple supergravity resembles D=11 supergravity in
many respects. We present their further resemblances in (1) the duality groups
upon dimensional reduction, and (2) the worldsheet structure of the solitonic
string of th...
Reinhold W. Gebert, Shun'ya Mizoguchi
Class.Quant.Grav.15:2165-2171,1998      Dec 1997
We show that any Tex-dimensional strictly stationary, asymptotically
Minkowskian solution Tex of a null reduction of Tex-dimensional pure
gravity must saturate the BPS bound provided that the KK vector field can be
identified appropriatel...
Shun'ya Mizoguchi
Nucl.Phys. B528 (1998) 238-264      Mar 1997
We consider dimensional reduction of the eleven-dimensional supergravity to
less than four dimensions. The three-dimensional Tex nonlinear
sigma model is derived by direct dimensional reduction from eleven dimensions.
In two dimensi...
Shun'ya Mizoguchi
Nucl.Phys. B461 (1996) 155-180      Jun 1995
The non-linear sigma model of the dimensionally reduced Einstein (-Maxwell)
theory is diagonally embedded into that of the two-dimensional heterotic string
theory. Consequently, the embedded string backgrounds satisfy the
(electro-magnetic) Ernst ...
Reinhold W. Gebert, Takeo Inami, Shun'ya Mizoguchi
Int.J.Mod.Phys. A11 (1996) 5479-5493      Mar 1995
We show that the Painlevé test is useful not only for probing
(non-)integrability but also for finding the values of spins of conserved
currents (W currents) in Toda field theories (TFTs). In the case of the TFTs
based on simple Lie algebras t...
Shun'ya Mizoguchi
Phys.Rev. D51 (1995) 6788-6802      Nov 1994
We study the Geroch group in the framework of the Ashtekar formulation. In
the case of the one-Killing-vector reduction, it turns out that the third
column of the Ashtekar connection is essentially the gradient of the Ernst
potential, which implie...
Shun'ya Mizoguchi, Hisashi Yamamoto
Phys.Rev. D50 (1994) 7351-7362      Jul 1993
Preliminary investigations are made for the stability of the Tex expansion
in three-dimensional gravity coupled to various matter fields, which are
power-counting renormalizable. For unitary matters, a tachyonic pole appears in
the spin-2 part o...
Shun'ya Mizoguchi
Int.J.Mod.Phys. A8 (1993) 3909-3932      Sep 1992
We study the Turaev-Viro invariant as the Euclidean Chern-Simons-Witten
gravity partition function with positive cosmological constant. After
explaining why it can be identified as the partition function of 3-dimensional
gravity, we show that the ...
Shun'ya Mizoguchi, Tsukasa Tada
Phys.Rev.Lett.68:1795-1798,1992      Oct 1991
We study the Tex-deformed su(2) spin network as a 3-dimensional quantum
gravity model. We show that in the semiclassical continuum limit the
Turaev-Viro invariant obtained recently defines naturally regularized
path-integral Tex la Pon...


New Solution-generation-techniques Using SL(2, R)-duality and General Black Holes
Shinya Tomizawa, Shun'Ya Mizoguchi
The Thirteenth Marcel Grossmann Meeting   1327-1329   2015
Phys. Lett.   222(2) 226-230   1989
Phys. Lett.   B231 112-118   1989
Int. J. Mod. Phys.   6(1) 133-162   1991
Theor. Phys.   87(3) 727-741   1992

Books etc

Noncompact Gepner Models for Type(]G0002[) Strings on a Conifold and an ALE Instanton
Proceedings of the 30th International Conference on High Energy Physics   2000   

Conference Activities & Talks

Realizing E6 GUT in F-theory [Invited]
KMI workshop "GUTs"   19 Dec 2017   
Introduction to the theory of Gravity for Nonspecialists [Invited]
Workshop on Gravitational physics with particle accelerators 2017   30 Nov 2017   
Looijenga’s weighted projective space, Mordell-Weil lattice and Yukawa textures from horizontal U(1) symmetries in F-theory [Invited]
Progress in Quantum Field Theory and String Theory II   27 Mar 2017   
Anomaly-free Multiple Singularity Enhancement in F-theory
YITP Workshop "Developments in String Theory and Quantum Field Theory”   9 Nov 2015   
F-theory Family Unification: A New Geometric Mechanism for Unparallel Three Families and Large Lepton-flavor Mixings
23 Jul 2014   
F-theory explained in 30 minutes [Invited]
3rd Workshop on Particle Physics of the Dark Universe   19 Apr 2014   
F-theory family unification [Invited]
KEK-TH 2014   19 Feb 2014   
Moduli stabilization in heterotic string theory [Invited]
The 3rd UTQuest workshop ExDiP 2012 “Superstring Cosmophysics”   6 Aug 2012   
Chiral generations on intersecting 5-branes in heterotic string theory [Invited]
Yong Pyong Astro-Particle and Conformal Topical Physics 2010   25 Feb 2010   
G2 sigma model
he IV International Symposium on Quantum Theory and Symmetries   15 Aug 2005   

Research Grants & Projects

Study on Symmetries in Superstring Theory