Results for "Mitsuru Kakizaki"

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Phenomenological signatures of mixed complex scalar WIMP dark matterSep 21 2016We discuss phenomenological aspects of models whose scalar sector is extended by an isospin doublet scalar and a complex singlet scalar as an effective theory of supersymmetric models with mixed sneutrinos. In such models, the lighter of the mixed neutral ... More
Singular Kahler Potential and Heavy Top Quark in A Democratic Mass Matrix ModelJul 30 2003It is pointed out that heavy top quark mass can be attributed to a singular normalization of its kinetic term, in which rescaling into canonical one yields large top Yukawa coupling. We pursue this novel possibility in a democratic mass matrix model where ... More
Proton Decay, Fermion Masses and Texture from Extra Dimensions in SUSY GUTsOct 19 2001May 05 2004In supersymmetry, there are gauge invariant dimension 5 proton decay operators which must be suppressed by a mass scale much larger than the Planck mass. It is natural to expect that this suppression should be explained by a mechanism that explains the ... More
U(1) Flavor Symmetry and Proton Decay in Supersymmetric Standard ModelMar 20 2002Jul 13 2002Issues of proton decay are examined in supersymmetric standard model with U(1) flavor symmetry. Dimension five proton-decay operators which arise generically are controlled by the flavor symmetry. We show that unlike the minimal supersymmetric SU(5) case ... More
Splitting Triplet and Doublet in Extra DimensionsApr 11 2001Apr 17 2001A novel mechanism to realize the triplet-doublet splitting in supersymmetric SU(5) grand unified theories is proposed in the framework of higher dimensional theories where chiral multiplets are localized due to kink configuration of a SU(5) singlet. An ... More
Phenomenological signatures of mixed complex scalar WIMP dark matterSep 21 2016Nov 09 2016We discuss phenomenological aspects of models whose scalar sector is extended by an isospin doublet scalar and a complex singlet scalar as an effective theory of supersymmetric models with mixed sneutrinos. In such models, the lighter of the mixed neutral ... More
The Thermal Abundance of Semi-Relativistic RelicsApr 20 2009Aug 11 2009Approximate analytical solutions of the Boltzmann equation for particles that are either extremely relativistic or non-relativistic when they decouple from the thermal bath are well established. However, no analytical formula for the relic density of ... More
Relic abundance of dark matter in the minimal universal extra dimension modelMay 26 2006We investigate the relic abundance of dark matter in the minimal universal extra dimension model including resonance processes by second Kaluza-Klein (KK) particles in all coannihilation processes. After including second KK resonance processes, the relic ... More
Constraints on the Very Early Universe from Thermal WIMP Dark MatterApr 12 2007Nov 16 2007We investigate the relic density n_\chi of non-relativistic long-lived or stable particles \chi in non-standard cosmological scenarios. We calculate the relic abundance starting from arbitrary initial temperatures of the radiation-dominated epoch, and ... More
Thermal relic abundance of the lightest Kaluza-Klein particle in phenomenological universal extra dimension modelsNov 21 2016Universal extra dimension models with Kaluza-Klein parity provide us excellent candidates for dark matter. We consider phenomenological universal extra dimension models where the Kaluza-Klein (KK) mass spectrum is different from that of the minimal universal ... More
Hadronic EDM Constraints on Orbifold GUTsMay 27 2005Oct 03 2005We point out that the null results of the hadronic electric dipole moment (EDM) searches constrain orbifold grand unified theories (GUTs), where the GUT symmetry and supersymmetry (SUSY) are both broken by boundary conditions in extra dimensions and it ... More
Gravitational waves as a probe of extended scalar sectors with the first order electroweak phase transitionSep 28 2015Dec 13 2015We discuss spectra of gravitational waves which are originated by the strongly first order phase transition at the electroweak symmetry breaking, which is required for a successful scenario of electroweak baryogenesis. Such spectra are numerically evaluated ... More
New Constraint on Squark Flavor Mixing from 199Hg Electric Dipole MomentNov 06 2003Dec 17 2003A new constraint is obtained on the CP-violating flavor mixing between the left-handed top scalar quark (\tilde{t}_L) and charm scalar quark (\tilde{c}_L), by considering a chargino loop contribution to chromo-electric dipole moment of strange quark, ... More
Abundance of Cosmological Relics in Low-Temperature ScenariosMar 21 2006May 16 2006We investigate the relic density n_\chi of non-relativistic long-lived or stable particles \chi in cosmological scenarios in which the temperature T is too low for \chi to achieve full chemical equilibrium. The case with a heavier particle decaying into ... More
Democratic (S)fermions and Lepton Flavor ViolationDec 12 2002The democratic approach to account for fermion masses and mixing is known to be successful not only in the quark sector but also in the lepton sector. Here we extend this ansatz to supersymmetric standard models, in which the K\"ahler potential obeys ... More
Large Supersymmetric Contribution to CP Asymmetry of B_d \to φK_S from Left-Handed Squark MixingMar 25 2004Apr 06 2004Supersymmetric contribution to the CP asymmetry of B_d \to \phi K_S is re-examined. It is emphasized that our analysis takes into account the recently found constraint from the mercury electric dipole moment, in addition to the well-known constraint from ... More
Phenomenological constraints on light mixed sneutrino dark matter scenariosMar 23 2015In supersymmetric models with Dirac neutrinos, the lightest sneutrino can be an excellent thermal dark matter candidate when the soft sneutrino trilinear parameter is large. We focus on scenarios where the mass of the mixed sneutrino is of the order of ... More
Relic Abundance of LKP Dark Matter in UED model including Effects of Second KK ResonancesAug 28 2005We reevaluate the thermal relic density of the Kaluza-Klein (KK) dark matter in universal extra dimension models. In particular, we consider the effect of the resonance caused by second KK particles on the density. We find that the annihilation cross ... More
Synergy between measurements of the gravitational wave and the triple Higgs coupling in probing first order phase transitionApr 07 2016Jul 20 2016Probing the Higgs potential and new physics behind the electroweak symmetry breaking is one of the most important issues of particle physics. In particular, nature of electroweak phase transition is essential for understanding physics at the early Universe, ... More
Vector WIMP MiracleFeb 27 2012May 25 2012Weakly interacting massive particle (WIMP) is well known to be a good candidate for dark matter, and it is also predicted by many new physics models beyond the standard model at the TeV scale. We found that, if the WIMP is a vector particle (spin one ... More
Testing Minimal Universal Extra Dimensions Using Higgs Boson Searches at the LHCJul 03 2012Dec 13 2012Large Hadron Collider (LHC) searches for the SM Higgs boson provide a powerful limit on models involving Universal Extra Dimensions (UED) where the Higgs production is enhanced. We have evaluated all one-loop diagrams for Higgs production from gluon fusion ... More
Gravitational waves and Higgs boson couplings for exploring first order phase transition in the model with a singlet scalar fieldSep 01 2016We calculate the spectrum of gravitational waves originated from strongly first order electroweak phase transition in the extended Higgs model with a real singlet field. In order to calculate the bubble nucleation rate, we perform a two-field analysis ... More
Higgs as a Probe of Supersymmetric Grand Unification with the Hosotani MechanismDec 29 2013Feb 19 2014The supersymmetric grand unified theory where the SU(5) gauge symmetry is broken by the Hosotani mechanism predicts the existence of adjoint chiral superfields whose masses are at the supersymmetry breaking scale. The Higgs sector is extended with the ... More
Significant effects of second KK particles on LKP dark matter physicsFeb 07 2005Jun 17 2005We point out that Kaluza-Klein (KK) dark matter physics is drastically affected by second KK particles. In this work various interesting phenomena caused by the second KK modes are discussed. In particular, we reevaluate the annihilation cross section ... More
Indirect reach of heavy MSSM Higgs bosons by precision measurements at future lepton collidersMay 14 2015Sep 11 2015In the Minimal Supersymmetric Standard Model (MSSM), the bottom Yukawa coupling of the Higgs boson can considerably deviate from its Standard Model prediction due to non-decoupling effects. We point out that the ratio of the Higgs boson decay branching ... More
Gravitational waves from first order electroweak phase transition in models with the $U(1)_X^{}$ gauge symmetryFeb 08 2018We consider a standard model extension equipped with a dark sector where the $U(1)_X^{}$ Abelian gauge symmetry is spontaneously broken by the dark Higgs mechanism. In this framework, we investigate patterns of the electroweak phase transition as well ... More
Hadronic EDMs in SUSY SU(5) GUTs with Right-handed NeutrinosJul 15 2004Dec 26 2004We discuss hadronic EDM constraints on the neutrino sector in the SUSY SU(5) GUT with the right-handed neutrinos. The hadronic EDMs are sensitive to the right-handed down-type squark mixings, especially between the second and third generations and between ... More
Adversarial Image Translation: Unrestricted Adversarial Examples in Face Recognition SystemsMay 09 2019Thanks to recent advances in Deep Neural Networks (DNNs), face recognition systems have achieved high accuracy in classification of a large number of face images. However, recent works demonstrate that DNNs could be vulnerable to adversarial examples ... More
Conjugate Codes and Applications to CryptographyOct 23 2006A conjugate code pair is defined as a pair of linear codes such that one contains the dual of the other. The conjugate code pair represents the essential structure of the corresponding Calderbank-Shor-Steane (CSS) quantum code. It is argued that conjugate ... More
Constructive Conjugate Codes for Quantum Error Correction and CryptographyMar 28 2007Mar 29 2007A conjugate code pair is defined as a pair of linear codes either of which contains the dual of the other. A conjugate code pair represents the essential structure of the corresponding Calderbank-Shor-Steane (CSS) quantum error-correcting code. It is ... More
Lower Bounds on the Quantum Capacity and Highest Error Exponent of General Memoryless ChannelsDec 18 2001Jun 21 2002Tradeoffs between the information rate and fidelity of quantum error-correcting codes are discussed. Quantum channels to be considered are those subject to independent errors and modeled as tensor products of copies of a general completely positive linear ... More
Exponential lower bound on the highest fidelity achievable by quantum error-correcting codesSep 21 2001Jun 21 2002On a class of memoryless quantum channels which includes the depolarizing channel, the highest fidelity of quantum error-correcting codes of length n and rate R is proven to be lower bounded by 1-exp[-nE(R)+o(n)] for some function E(R). The E(R) is positive ... More
Phase-transient hierarchical turbulence as an energy correlation generator of blazar light curvesFeb 06 2008Apr 10 2008Hierarchical turbulent structure constituting a jet is considered to reproduce energy-dependent variability in blazars, particularly, the correlation between X- and gamma-ray light curves measured in the TeV blazar Markarian 421. The scale-invariant filaments ... More
Eigenmodes and growth rates of relativistic current filamentation instability in a collisional plasmaDec 25 2003I theoretically found eigenmodes and growth rates of relativistic current filamentation instability in collisional regimes, deriving a generalized dispersion relation from self-consistent beam-Maxwell equations. For symmetrically counterstreaming, fully ... More
The Minimum Number of Rotations About Two Axes for Constructing an Arbitrary Fixed RotationDec 31 2013Jun 30 2014For any pair of three-dimensional real unit vectors $\hat{m}$ and $\hat{n}$ with $|\hat{m}^{\rm T} \hat{n}| < 1$ and any rotation $U$, let $N_{\hat{m},\hat{n}}(U)$ denote the least value of a positive integer $k$ such that $U$ can be decomposed into a ... More
Information Rates Achievable with Algebraic Codes on Quantum Discrete Memoryless ChannelsJul 19 2002Dec 30 2002The highest information rate at which quantum error-correction schemes work reliably on a channel, which is called the quantum capacity, is proven to be lower bounded by the limit of the quantity termed coherent information maximized over the set of input ... More
An Exposition of a Result in "Conjugate Codes for Secure and Reliable Information Transmission"Jan 12 2010An elementary proof of the attainability of random coding exponent with linear codes for additive channels is presented. The result and proof are from Hamada (Proc. ITW, Chendu, China, 2006), and the present material explains the proof in detail for those ... More
Notes on the Fidelity of Symplectic Quantum Error-Correcting CodesNov 01 2003Nov 24 2003Two observations are given on the fidelity of schemes for quantum information processing. In the first one, we show that the fidelity of a symplectic (stabilizer) code, if properly defined, exactly equals the `probability' of the correctable errors for ... More
Reliability of Calderbank-Shor-Steane Codes and Security of Quantum Key DistributionAug 05 2003Jul 23 2004After Mayers (1996, 2001) gave a proof of the security of the Bennett-Brassard 1984 (BB84) quantum key distribution protocol, Shor and Preskill (2000) made a remarkable observation that a Calderbank-Shor-Steane (CSS) code had been implicitly used in the ... More
Quantum symmetries of the deformation quantization of $SU(3)$Nov 15 2017Apr 03 2018We prove a criterion of when a coaction of a compact Lie group on an algebra of continuous functions on a compact manifold extends to a coaction of deformation quantizations of the Lie group and the algebra. We compute an explicit example of a compact ... More
Relativistic heat conduction and thermoelectric properties of nonuniform plasmasDec 25 2003Relativistic heat transport in electron-two-temperature plasmas with density gradients has been investigated. The Legendre expansion analysis of relativistically modified kinetic equations shows that strong inhibition of heat flux appears in relativistic ... More
Variational proof of the existence of the super-eight orbit in the four-body problemJul 11 2013Sep 09 2013Using the variational method, Chenciner and Montgomery (2000 Ann. Math. 152 881--901) proved the existence of an eight-shaped periodic solution of the planar three-body problem with equal masses. Just after the discovery, Gerver have numerically found ... More
Concatenated Conjugate CodesOct 23 2006Oct 31 2006A conjugate code pair is defined as a pair of linear codes either of which contains the dual of the other. A conjugate code pair represents the essential structure of the corresponding Calderbank-Shor-Steane (CSS) quantum code. It is known that conjugate ... More
Constraints on the temperature inhomogeneity in quasar accretion discs from the ultraviolet-optical spectral variabilityFeb 27 2015The physical mechanisms of the quasar ultraviolet (UV)-optical variability are not well understood despite the long history of observations. Recently, Dexter & Agol presented a model of quasar UV-optical variability, which assumes large local temperature ... More
Nonequilibrium process in the $σ$ model and chemical relaxation time in a homogeneous pionic gasAug 08 1996In a homogeneous pionic gas system, chemical nonequilibrium process is considered to understand its effect in the expansion processes that are realized immediately after heavy ion collisions. The chemical relaxation time is calculated by incorporating ... More
Ultra-High Energy Cosmic-Ray Acceleration in the Jet of Centaurus ANov 05 2009We evaluate the achievable maximum energy of nuclei diffusively accelerated by shock wave in the jet of Cen A, based on an updated model involving the stochastic magnetic fields that are responsible for recent synchrotron X-ray measurements. For the maximum ... More
Teleportation and entanglement distillation in the presence of correlation among bipartite mixed statesFeb 07 2003The teleportation channel associated with an arbitrary bipartite state denotes the map that represents the change suffered by a teleported state when the bipartite state is used instead of the ideal maximally entangled state for teleportation. This work ... More
A Lower Bound on the Quantum Capacity of Channels with Correlated ErrorsJan 14 2002Jun 21 2002The highest fidelity of quantum error-correcting codes of length n and rate R is proven to be lower bounded by 1 - exp [-n E(R)+ o(n)] for some function E(R) on noisy quantum channels that are subject to not necessarily independent errors. The E(R) is ... More
Concatenated Quantum Codes Constructible in Polynomial Time: Efficient Decoding and Error CorrectionOct 23 2006Aug 19 2008A method for concatenating quantum error-correcting codes is presented. The method is applicable to a wide class of quantum error-correcting codes known as Calderbank-Shor-Steane (CSS) codes. As a result, codes that achieve a high rate in the Shannon ... More
Constraints on the optical polarization source in the luminous non-blazar quasar 3C 323.1 (PG 1545+210) from the photometric and polarimetric variabilityJan 13 2017We examine the optical photometric and polarimetric variability of the luminous type 1 non-blazar quasar 3C 323.1 (PG 1545+210). Two optical spectro-polarimetric measurements taken during the periods 1996$-$98 and 2003 combined with a $V$-band imaging ... More
Connes-Landi spheres are homogeneous spacesAug 07 2018Nov 02 2018In this paper, we review some recent developments of compact quantum groups that arise as $\theta$-deformations of compact Lie groups of rank at least two. A $\theta$-deformation is merely a 2-cocycle deformation using an action of a torus of dimension ... More
X-ray Fluctuations from the Slim DiskMay 08 2000The responses of perturbations added into the optically thick, advection-dominated accretion disk (ADAD), what we call the slim disk (SD), are investigated through numerical simulations. Although it is proposed that the SD is thermally stable, I find ... More
Scalings of the synchrotron cut-off and turbulent correlation of active galactic nucleus jetsSep 02 2010We propose a new analytic scaling of the cut-off frequency of synchrotron radiation from active galactic nucleus (AGN) jets that are nonuniformly filled with many filaments. The theoretical upper limit is provided independent of magnetic intensity, spectral ... More
Suppression of resistive hose instability in a relativistic electron-positron flowFeb 14 2007Apr 02 2007This paper presents the effects of electron-positron pair production on the linear growth of the resistive hose instability of a filamentary beam that could lead to snake-like distortion. For both the rectangular radial density profile and the diffuse ... More
Hydrodynamic Implosion Simulation Including Relativistic Effects on Petawatt-Class Pulse HeatingDec 25 2003A spherically symmetric fluid code that includes the relativistic effects of hot electrons has been newly developed. In the present simulations, I attempt to implode a target shell of laser fusion using a nanosecond pulse; then, an additional heating ... More
Non-integrability criterion for homogeneous Hamiltonian systems via blowing-up technique of singularitiesJul 17 2013It is a big problem to distinguish between integrable and non-integrable Hamiltonian systems. We provide a new approach to prove the non-integrability of homogeneous Hamiltonian systems with two degrees of freedom. The homogeneous degree can be chosen ... More
Adversarial Image Translation: Unrestricted Adversarial Examples in Face Recognition SystemsMay 09 2019May 27 2019Thanks to recent advances in Deep Neural Networks (DNNs), face recognition systems have achieved high accuracy in classification of a large number of face images. However, recent works demonstrate that DNNs could be vulnerable to adversarial examples ... More
Structural resolvent estimates and derivative nonlinear Schrodinger equationsJan 26 2011A refinement of uniform resolvent estimate is given and several smoothing estimates for Schrodinger equations in the critical case are induced from it. The relation between this resolvent estimate and radiation condition is discussed. As an application ... More
Odd-particle number random phase approximation and extensions: Applications to particle and hole states around $^{16}$OJan 10 2013The hole-state random phase approximation (hRPA) and the particle-state random phase approximation (pRPA) for systems like odd $A$ nuclei are discussed. These hRPA and pRPA are formulated based on the Hartree-Fock ground state. An extension of hRPA and ... More
How to Make a Digital Currency on a Blockchain StableJan 21 2018Bitcoin and other similar digital currencies on blockchains are not ideal means for payment, because their prices tend to go up in the long term (thus people are incentivized to hoard those currencies), and to fluctuate widely in the short term (thus ... More
A counterexample for boundedness of pseudo-differential operators on modulation spacesJan 25 2007We prove that pseudo-differential operators with symbols in the class $S_{1,\delta}^0$ ($0<\delta<1$) are not always bounded on the modulation space $M^{p,q}$ ($q\neq2$).
Optimal constants and extremisers for some smoothing estimatesJun 22 2012Nov 11 2012We establish new results concerning the existence of extremisers for a broad class of smoothing estimates of the form $\|\psi(|\nabla|) \exp(it\phi(|\nabla|)f \|_{L^2(w)} \leq C\|f\|_{L^2}$, where the weight $w$ is radial and depends only on the spatial ... More
Trace theorems: critical cases and best constantsAug 15 2012The purpose of this paper is to present the critical cases of the trace theorems for the restriction of functions to closed surfaces, and to give the asymptotics for the norms of the traces under dilations of the surface. We also discuss the best constants ... More
Extension of time-dependent Hartree-Fock-Bogoliubov equationsNov 21 2014An extension of the time-dependent Hartree-Fock-Bogoliubov theory (ETDHFB) which includes higher-order effects such as screening of the pairing correlation is proposed. ETDHFB is applied to a fermion system trapped in a harmonic potential to test its ... More
Density-matrix formalism with three-body ground-state correlationsMar 01 2010A density-matrix formalism which includes the effects of three-body ground- state correlations is applied to the standard Lipkin model. The reason to consider the complicated three-body correlations is that the truncation scheme of reduced density matrices ... More
Thermodynamics in Density-Functional Theory and Force TheoremsJul 02 2003Jul 17 2003The density-functional (DF) theory provides a simple method for calculating the properties of an interacting system under an external potential by associating it with a corresponding non-interacting system. Here, we find some relations in this non-interacting ... More
Partial Pressures in Liquid Mixtures and Osmotic PressuresJun 21 2012Feb 12 2015When an osmotic system is composed of 1- and 0-species particles, which are confined to the volumes, $V\equiv V_{\rm a}+V_{\rm b}$ and $V_{\rm b}$, by the wall pressures, $P_1^{{\rm w}_{\rm a}}$ and $P_0^{{\rm w}_{\rm b}}$, respectively, we obtain a law ... More
Unusual Dielectric Relaxation in Lightly Doped n-Type Rhombohedral BaTi0.85Zr0.15O3:Ta Ferroelectric CeramicsMar 10 2005The dielectric properties of tantalum doped BaTi0.85Zr0.15O3 were investigated. The conventional solid state reaction method was used to make the ceramic samples. The composition was close to the pinch point of the three structure phase transitions in ... More
The dilation property of modulation spaces and their inclusion relation with Besov spacesJun 08 2006We consider the dilation property of the modulation spaces $M^{p,q}$. Let $D_\lambda:f(t)\mapsto f(\lambda t)$ be the dilation operator, and we consider the behavior of the operator norm $\|D_\lambda\|_{M^{p,q}\to M^{p,q}}$ with respect to $\lambda$. ... More
Permutation test for dendrograms and its application to the analysis of mental lexiconsMar 12 2014A novel type of permutation tests for dendrogram data is studied with respect to two types of metrics for measuring the difference between dendrograms. First, the Frobenius norm is used, and we prove the consistency and efficiency of the permutation tests. ... More
A local-to-global boundedness argument and Fourier integral operatorsNov 24 2017We give a criterion for the global boundedness of integral operators which are known to be locally bounded. As an application, we discuss the global $L^p$-boundedness for a class of Fourier integral operators. While the local $L^p$-boundedness of Fourier ... More
Dark matter in UED : the role of the second KK levelDec 12 2010We perform a complete calculation of the relic abundance of the KK-photon LKP in the universal extra dimension model including all coannihilation channels and all resonances. We show that the production of level 2 particles which decay dominantly into ... More
Truncation scheme of time-dependent density-matrix approachDec 13 2013A truncation scheme of the Bogoliubov-Born-Green-Kirkwood-Yvon hierarchy for reduced density matrices, where a three-body density matrix is approximated by the antisymmetrized products of two-body density matrices, is proposed. This truncation scheme ... More
Slim Disk Model for Narrow-Line Seyfert 1 GalaxiesMay 08 2000We argue that both the extreme soft X-ray excess and the large-amplitude variability of Narrow-Line Seyfert 1 galaxies (NLS1s) can be explained in the framework of the slim disk model. When the disk luminosity approaches the Eddington luminosity, the ... More
Riemannian curvature of the noncommutative 3-sphereMay 27 2015Nov 18 2015In order to investigate to what extent the calculus of classical (pseudo-)Riemannian manifolds can be extended to a noncommutative setting, we introduce pseudo-Riemannian calculi of modules over noncommutative algebras. In this framework, it is possible ... More
Truncation scheme of time-dependent density-matrix approach IIIApr 14 2019The time-dependent density-matrix theory (TDDM) where the Bogoliubov-Born-Green-Kirkwood-Yvon hierarchy for reduced density matrices is truncated by approximating a three-body density matrix with one-body and two-body density matrices is applied to the ... More
Ferroelectricity in Silver Perovskite OxidesAug 30 2011There are two silver perovskite oxides: AgNbO3 and AgTaO3. AgNbO3 has a noncentrosymmetric group of Pmc21 at room temperature with a ferri-electric ordering of polarization. Such a ferri-electric state with small polarization can be changed into a ferroelectric ... More
Global L2-boundedness theorems for a class of Fourier integral operatorsNov 13 2003The local $L^2$-mapping property of Fourier integral operators has been established in H\"ormander \cite{H} and in Eskin \cite{E}. In this paper, we treat the global $L^2$-boundedness for a class of operators that appears naturally in many problems. As ... More
Report by the Committee on the Scientific Case of the ILC Operating at 250 GeV as a Higgs FactoryOct 24 2017This document is the final report by the Committee on the Scientific Case of the ILC Operating at 250 GeV as a Higgs Factory. This committee was commissioned by the Japan Association of High Energy Physicists. The purpose of this committee is to investigate ... More
Electron and nuclear pressures in electron-nucleus mixturesMar 04 2003Jan 26 2007It is shown for an electron-nucleus mixture that the electron and nuclear pressures are defined clearly and simply by the virial theorem; the total pressure of this system is a sum of these two pressures. The electron pressure is different from the conventional ... More
Enhancement of non-resonant dielectric cloaks using anisotropic compositesJun 14 2013Jul 25 2013Cloaking techniques conceal objects by controlling the flow of electromagnetic waves to minimize scattering. Herein, the effectiveness of homogenized anisotropic materials in non-resonant dielectric multilayer cloaking is studied. Because existing multilayer ... More
Progress in Many Body Theory with the Equation of Motion method. Time dependent Density Matrix meets Self-Consistent RPA. Applications to solvable ModelsMar 28 2016The Bogoliubov-Born-Green-Kirkwood-Yvon or Time-Dependent Density Matrix (TDDM) hierarchy of equations for higher density matrices is truncated at the three body level in approximating the three body correlation function by a quadratic form of two body ... More
Smoothing estimates for non-dispersive equationsAug 03 2015This paper describes an approach to global smoothing problems for non-dispersive equations based on ideas of comparison principle and canonical transformation established in authors' previous paper, where dispersive equations were treated. For operators ... More
Operator ordering and Classical soliton path in Two-dimensional N=2 supersymmetry with Kahler potentialAug 03 2005Oct 25 2005We investigate a 2-dimensional N=2 supersymmetric model which consists of n chiral superfields with Kahler potential. When we define quantum observables, we are always plagued by operator ordering problem. Among various ways to fix the operator order, ... More
Testing Forest-Isomorphism in the Adjacency List ModelApr 28 2014We consider the problem of testing if two input forests are isomorphic or are far from being so. An algorithm is called an $\varepsilon$-tester for forest-isomorphism if given an oracle access to two forests $G$ and $H$ in the adjacency list model, with ... More
Rapid Luminosity Decline and Subsequent Reformation of the Innermost Dust Distribution in the Changing-look AGN Mrk 590Apr 18 2019We examined long-term optical/near-infrared (NIR) flux variability of a "changing-look" active galactic nucleus (AGN) Mrk 590 between 1998 and 2007. Multi-band multi-epoch optical/NIR photometry data from the SDSS Stripe 82 database and the Multicolor ... More
Criteria for Bochner's extension problemFeb 05 2008A necessary and sufficient condition for the resolution of the weak extension problem is given. This criterion is applied to also give a criterion for the solvability of the classical Bochner's extension problem in the $L^p$-category. The solution of ... More
Smoothing properties of inhomogeneous equations via canonical transformsFeb 25 2013The paper describes a new approach to global smoothing problems for inhomogeneous dispersive evolution equations based on an idea of canonical transformation. In our previous papers, we introduced such a method to show global smoothing estimates for homogeneous ... More
Optimal forward and reverse estimates of Morawetz and Kato-Yajima type with angular smoothing indexSep 20 2014For the solution of the free Schr\"odinger equation, we obtain the optimal constants and characterise extremisers for forward and reverse smoothing estimates which are global in space and time, contain a homogeneous and radial weight in the space variable, ... More
A smoothing property of Schrodinger equations in the critical caseMay 28 2004In this paper a global smoothing property of Schrodinger equations is established in the critical case in dimensions two and higher. It is shown that the critical smoothing estimate is attained if the smoothing operator has some structure. This structure ... More
A remark on fractional integrals on modulation spacesJul 03 2007In this paper, we give the necessary and sufficient conditions for the boundedness of fractional integral operators on the modulation spaces.
Recent progress in smoothing estimates for evolution equationsFeb 07 2014This paper is a survey article of results and arguments from several of authors' papers, and it describes a new approach to global smoothing problems for dispersive and non-dispersive evolution equations based on ideas of comparison principle and canonical ... More
Fragmentation of electric dipole strength in N=82 isotonesDec 06 2011Fragmentation of the dipole strength in the N=82 isotones 140Ce, 142Nd and 144Sm is calculated using the second random-phase approximation (SRPA). In comparison with the result of the random-phase approximation (RPA), the SRPA provides the additional ... More
Operator ordering in Two-dimensional N=1 supersymmetry with curved manifoldAug 21 2007We investigate an operator ordering problem in two-dimensional N=1 supersymmetric model which consists of n real superfields. There arises an operator ordering problem when the target space is curved. We have to fix the ordering in quantum operator properly ... More
The inclusion relation between Sobolev and modulation spacesSep 05 2010Sep 07 2010The inclusion relations between the $L^p$-Sobolev spaces and the modulation spaces is determined explicitly. As an application, mapping properties of unimodular Fourier multiplier $e^{i|D|^\alpha}$ between $L^p$-Sobolev spaces and modulation spaces are ... More
On Hadamard's global inverse function theorem (On global inversion of homogeneous maps)May 25 2013Oct 08 2014Hadamard's global inverse theorem provides conditions for a function to be globally invertible on Rn. In this note we show that the conditions are robust enough for the conclusion to hold even if we relax the conditions by removing the assumption at a ... More
Role of Ca off-centering in tuning the ferroelectric phase transitions in Ba(Zr,Ti)O3 systemMar 02 2015We here report the substitution effects of the smaller Ca for the bulky Ba in (Ba1-xCax)(Ti1-yZry)O3 perovskite oxides for two systems (Ba1-xCax)TiO3 with y=0 and (Ba1-xCax)(Ti0.9Zr0.1)O3 with y=0.1. Ca off-centering was found to play a critical role ... More
Boundedness properties of pseudo-differential operators and Calderón-Zygmund operators on modulation spacesJan 29 2007In this paper, we study the boundedness of pseudo-differential operators with symbols in $S_{\rho,\delta}^m$ on the modulation spaces $M^{p,q}$. We discuss the order $m$ for the boundedness $\mathrm{Op}(S_{\rho,\delta}^m) \subset \calL(M^{p,q}(\R^n))$ ... More
Smoothing estimates for evolution equations via canonical transforms and comparisonDec 11 2006Jun 08 2007The paper describes a new approach to global smoothing problems for dispersive and non-dispersive evolution equations based on the global canonical transforms and the underlying global microlocal analysis. For this purpose, the Egorov-type theorem is ... More
Weighted Sobolev L2 estimates for a class of Fourier integral operatorsNov 19 2007In this paper we develop elements of the global calculus of Fourier integral operators in $R^n$ under minimal decay assumptions on phases and amplitudes. We also establish global weighted Sobolev $L^2$ estimates for a class of Fourier integral operators ... More