We investigate the phase structure of the compactified -dimensional
nonlinear flag sigma model with respect to two -terms.
Based on the circle compactification with the -twisted
boundary condition, which ...
We derive the semiclassical contributions from the real and complex bions in
the two-dimensional sigma model on with a twisted boundary condition. The bion configurations are saddle
points of the comp...
Progress of Theoretical and Experimental Physics 2018(12) 123B03 2018年12月 [査読有り]
We study a certain class of supersymmetric (SUSY) observables in 3d SUSY Chern-Simons (CS) matter theories and investigate how
their exact results are related to the perturbative series with respect to
coupling constants given by i...
Yuya Tanizaki, Yuta Kikuchi, Tatsuhiro Misumi, Norisuke Sakai
Physical Review D 97(05) 054012 2018年3月 [査読有り]
We elucidate that the phase diagram of massless -flavor QCD under flavor-twisted boundary condition (massless -QCD)
is constrained by an 't Hooft anomaly involving two-form gauge fields. As a
consequence, massless $...
Journal of High Energy Physics 2017(12) 056 2017年12月 [査読有り]
Anomaly matching constrains low-energy physics of strongly-coupled field
theories, but it is not useful at finite temperature due to contamination from
high-energy states. The known exception is an 't Hooft anomaly involving
one-form symmetries as...
We propose a new class of tight-binding models where a flat band is either
gapped from or crossing right through a dispersive band on two-band (i.e., two
sites/unit cell) tetragonal and honeycomb lattices. By imposing a condition on
the hopping pa...
Progress of Theoretical and Experimental Physics 2017(08) 083B02 2017年8月 [査読有り]
We investigate the resurgence structure in quantum mechanical models
originating in 2d non-linear sigma models with emphasis on nearly
supersymmetric and quasi-exactly solvable parameter regimes. By expanding the
ground state energy in powers of a...
The full resurgent trans-series is found exactly in near-supersymmetric quantum mechanics. By expanding in powers of the SUSY breaking
deformation parameter, we obtain the first and second expansion coefficients of
the ground state...
Syo Kamata, So Matsuura, Tatsuhiro Misumi, Kazutoshi Ohta
Proceedings of Science Lattice2016 2016年12月 [査読有り]
We perform a numerical simulation of the two-dimensional
supersymmetric Yang-Mills (SYM) theory on the discretized curved space. The anomaly of the continuum theory is maintained also in the
discretized theory as an unb...
We discuss the non-perturbative contributions from real and complex saddle
point solutions in the quantum mechanics with fermionic degrees
of freedom, using the Lefschetz thimble formalism beyond the gaussian
approximation. We find...
Syo Kamata, So Matsuura, Tatsuhiro Misumi, Kazutoshi Ohta
Progress of Theoretical and Experimental Physics 2016(12) 123B01 2016年12月 [査読有り]
We investigate the two-dimensional supersymmetric
Yang-Mills (SYM) theory on the discretized curved space (polyhedra). We first
revisit that the number of supersymmetries of the continuum
SYM theory on any c...
Journal of High Energy Physics 2016(05) 057 2016年5月 [査読有り]
We investigate non-BPS exact solutions in sigma models
on with twisted boundary conditions, by using the
Din-Zakrzewski projection method. We focus on the relation of the non-BPS
solutions to the a...
Journal of High Energy Physics 2015(11) 159 2015年11月 [査読有り]
We investigate QCD-like theory with exact center symmetry, with emphasis on
the finite-temperature phase transition concerning center and chiral
symmetries. On the lattice, we formulate center symmetric gauge theory
with three fundamental ...
Proceedings of Science Lattice2015 2015年10月 [査読有り]
For the -symmetric lattice QCD-like theory (-QCD), in which gauge theory is coupled with three fundamental Wilson quarks with
flavor-dependent twisted boundary conditions, we calculate the expectation
values of Polyakov loop an...
Journal of High Energy Physics 2015(09) 157 2015年9月 [査読有り]
We compute multi-instanton amplitudes in the sine-Gordon quantum mechanics
(periodic cosine potential) by integrating out quasi-moduli parameters
corresponding to separations of instantons and anti-instantons. We propose an
extension of Bogomolnyi...
We investigate QCD at large mu/T by using Z_3-symmetric SU(3) gauge theory,
where mu is the quark-number chemical potential and T is temperature. We impose
the flavor-dependent twist boundary condition on quarks in QCD. This QCD-like
theory has th...
Journal of Physics: Conference Series 597(01) 012060 2015年3月 [査読有り]
Classical configurations in the CP^{N-1} model on R^1 x S^1 is studied with
twisted boundary conditions. Starting from fractional instantons with the Z_N
twisted boundary conditions, we review briefly the relevance of our study to
resurgence pheno...
Progress of Theoretical and Experimental Physics 2015(03) 033B07 2015年3月 [査読有り]
We apply the localization technique to topologically twisted N=(2,2)
supersymmetric gauge theory on a discretized Riemann surface (the generalized
Sugino model). We exactly evaluate the partition function and the vacuum
expectation value (vev) of ...
Progress of Theoretical and Experimental Physics 2014(12) 123B01 2014年12月 [査読有り]
We define supersymmetric Yang-Mills theory on an arbitrary two-dimensional
lattice (polygon decomposition) with preserving one supercharge. When a smooth
Riemann surface with genus emerges as an appropriate continuum
limit of the ge...
Journal of High Energy Physics 2014(06) 181 2014年6月 [査読有り]
We investigate QCD with adjoint Dirac fermions on
with generic boundary conditions for fermions along . By means of
perturbation theory, semiclassical methods and a chiral effective model, we
elucidate a rich phase st...
Journal of High Energy Physics 2014(06) 164 2014年6月
We study classical configurations in the model on with twisted boundary conditions. We focus on
specific configurations composed of multiple fractionalized-instantons, termed
"neutral bions", whic...
Proceedings of Scieince, Lattice2013 101 2013年12月 [査読有り]
We investigated the phase diagram of gauge theory in four dimension
with one compact dimension by using the perturbative one-loop effective
potential. Effects of the adjoint and fundamental fermions are investigated and
then the rich phase...
Journal of High Energy Physics 2013(12) 063 2013年12月 [査読有り]
We revisit 2D super Yang-Mills lattice formulation
(Sugino model) to investigate its fermion action with two (Majorana) fermion
flavors and exact chiral- symmetry. We show that the reconcilement of
chiral symmetry and...
We investigate differences and similarities between fundamental fermions and
adjoint fermions in SU(N) gauge theories. The gauge theory with fundamental
fermions possesses ZN symmetry only in the limit of infinite fermion mass,
whereas the gauge t...
Journal of High Energy Physics 2013(05) 042 2013年5月 [査読有り]
We investigate the phase structure of SU(3) gauge theory in four and five dimensions with one compact dimension by using perturbative one-loop and PNJL-model-based effective potentials, with emphasis on spontaneous gauge symmetry breaking. When ad...
Proceedings of Science, Lattice2012 005 2012年11月 [査読有り][招待有り]
We review the recent progress in new lattice fermion formulations. We focus
on the following three types which have possibility of improving lattice
simulations. (1) Flavored-mass fermions are a generalization of Wilson fermions
with species-split...
Proceedings of Science, Lattice2012 079 2012年10月 [査読有り]
We propose a new framework for investigating two-flavor lattice QCD with
finite temperature and density by applying the Karsten-Wilczek lattice fermion,
in which a species-dependent imaginary chemical potential can reduce the number
of species to ...
Takashi Z. Nakano, Tatsuhiro Misumi, Taro Kimura, Akira Ohnishi
Proceedings of Science, Lattice2012 203 2012年10月 [査読有り]
We study strong-coupling lattice QCD with staggered-Wilson fermions, with an
emphasis on the possibility of spontaneous parity breaking. We perform
effective potential analysis in the strong-coupling limit. From gap equations
we find the pion cond...
We propose a new framework for investigating two-flavor lattice QCD with
finite temperature and density. We consider the Karsten-Wilczek fermion
formulation, in which a species-dependent imaginary chemical potential term can
reduce the number of s...
Journal of High Energy Physics 2012(08) 068 2012年8月 [査読有り]
We discuss the chiral phase diagram in the parameter space of lattice QCD with minimal-doubling fermions, which can be seen as lattice fermions with flavored chemical potential terms. We study strong-coupling lattice QCD with the Karsten-Wilczek f...
Tatsuhiro Misumi, Takashi Z. Nakano, Taro Kimura, Akira Ohnishi
Physical Review D 86 03-034501 2012年8月 [査読有り]
We study strong-coupling lattice QCD with staggered-Wilson fermions, with
emphasis on discrete symmetries and possibility of their spontaneous breaking.
We perform hopping parameter expansion and effective potential analyses in the
strong-coupling...
Journal of High Energy Physics 2012(01) 048 2012年1月 [査読有り]
Employing the spin-flavor representation, we investigate the structures of
the doubler-mixing symmetries and the mechanisms of their spontaneous breakdown
in four types of lattice fermion formulation. We first revisit the symmetr...
Proceedings of Science, Lattice2011 106 2011年10月 [査読有り]
We present a theoretical foundation for the index theorem in naive and
minimally doubled lattice fermions by studying the spectral flow of a Hermitean
version of Dirac operators. We utilize the point splitting method to implement
flavored mass ter...
Tatsuhiro Misumi, Michael Creutz, Taro Kimura, Takashi Z. Nakano, Akira Ohnishi
Proceedings of Science, Lattice2011 108 2011年10月 [査読有り]
We investigate the parity-broken phase (Aoki phase) for staggered-Wilson
fermions by using the Gross-Neveu model and the strong-coupling lattice QCD. In
the both cases the gap equations indicate the parity-broken phase exists and
the pion becomes ...
We investigate the parity-broken phase structure for staggered and naive
fermions in the Gross-Neveu model as a toy model of QCD. We consider a
generalized staggered Gross-Neveu model including two types of four-point
interactions. We use generali...
Journal of High Energy Physics 2010(12) 041 2010年12月 [査読有り]
We present a theoretical foundation for the Index theorem in naive and minimally doubled lattice fermions by studying the spectral flow of a Hermitean version of Dirac operators. We utilize the point splitting method to implement flavored mass ter...
Proceedings of Science, Lattice2010 260 2010年10月 [査読有り]
We propose a method to control the number of species of lattice fermions,
which yields new classes of minimally doubled lattice fermions with one exact
chiral symmetry and exact locality. We classify all the known minimally doubled
fermions into t...
We propose a method to control the number of species of lattice fermions
which yields new classes of minimally doubled lattice fermions. We show it is
possible to control the number of species by handling Wilson-term-like
corrections in fer...
We investigate the finite-temperature spectral functions of heavy quarkonia
by using the soft-wall AdS/QCD model. We discuss the scalar, the pseudo-scalar,
the vector, and the axial-vector mesons and compare their qualitative features
of the melti...
Progress of Theoretical Physics 123(1) 63-78 2010年1月 [査読有り]
In this paper we generalize to higher dimensions several types of fermion
actions on the hyperdiamond lattice including a two-parameter class of
minimal-doubling fermions "Creutz fermion" and a simple fermion with sufficient
discrete symmetry "BBT...
Progress of Theoretical Physics 124(3) 415-432 2010年9月 [査読有り]
We study minimal-doubling fermion actions on hyperdiamond and deformed
hyperdiamond lattices, with emphasis on the real-space construction of them and
Lorentz covariance of excitations from fermion poles. We propose the improved
spatial constructi...
We use the soft-wall AdS/QCD model to investigate the finite-temperature
effects on the spectral function in the vector channel. The dissociation of the
vector meson tower onto the AdS black hole leads to the in-medium mass shift
and the width bro...
The electromagnetic response of bilayer graphene in a magnetic field is studied in comparison to that of monolayer graphene. Both types of graphene turn out to be qualitatively quite similar in dielectric and screening characteristics, especially ...
The purpose of this work is to investigate the relation between perturbative calculation and non-perturbativephysics in quantum theory. For this purpose, we calculate multi-instanton amplitudes in Sine-Gordon quantummechanics by integrating out qu...
教育Gamma-ray spectrometers enable one to detect insensible radiation quantitatively. People unfamiliar to science, however, find it difficult to read results through data of the detectors often. This situation results in their indifference to radia...
We study strong-coupling lattice QCD with staggered-Wilson fermions, with
emphasis on discrete symmetries and possibility of their spontaneous breaking.
We perform hopping parameter expansion and effective potential analyses in the
strong-coupling...
The electromagnetic response of bilayer graphene in a magnetic field is
studied in comparison with that of monolayer graphene. Both types of graphene
turn out to be qualitatively quite similar in dielectric and screening
characteristics, especiall...
