Results for "S. Hashimoto"

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Room-temperature generation of giant pure spin currents using Co$_2$FeSi spin injectorsJul 31 2011Aug 13 2011Generation, manipulation, and detection of a pure spin current, i.e., the flow of spin angular momentum without a charge current, are prospective approaches for realizing next-generation spintronic devices with ultra low electric power consumptions. Conventional ... More
Equivariant twisted inverse without equivariant compactificationFeb 10 2003Mar 19 2003An equivariant version of the twisted inverse pseudofunctor is defined, and equivariant versions of some important properties, including the Grothendieck duality of proper morphisms and flat base change are proved. As an application, a generalized version ... More
Growth fluctuation in preferential attachment dynamicsSep 18 2015Sep 29 2015In the Yule-Simon process, selection of words follows the preferential attachment mechanism, resulting in the power-law growth in the cumulative number of individual word occurrences. This is derived using mean-field approximation, assuming a continuum ... More
Base change of invariant subringsNov 04 2005Let $R$ be a Dedekind domain, $G$ an affine flat $R$-group scheme, and $B$ a flat $R$-algebra on which $G$ acts. Let $A \to B^G$ be an $R$-algebra map. Assume that $A$ is Noetherian. We show that if the induced map $K\otimes A\to (K\otimes B)^{K\otimes ... More
Another proof of theorems of De Concini and ProcesiAug 31 2004We give a new proof of some characteristic-free fundamental theorems in invariant theory first proved in C. De Concini and C. Procesi, A characteristic free approach to invariant theory, Adv. Math. 21 (1976), 330--354. We treat the action of the general ... More
Estimation of the spin polarization for Heusler-compound thin films by means of nonlocal spin-valve measurements: Comparison of Co$_{2}$FeSi and Fe$_{3}$SiNov 03 2011Jan 14 2012We study room-temperature generation and detection of pure spin currents using lateral spin-valve devices with Heusler-compound electrodes, Co$_{2}$FeSi (CFS) or Fe$_{3}$Si (FS). The magnitude of the nonlocal spin-valve (NLSV) signals is seriously affected ... More
O(a^2) improvement of the overlap-Dirac operatorDec 21 2009We construct an $O(a^2)$-improved overlap-Dirac operator by designing an improved overlap kernel, based on the Symanzik improvement program. Field rotation terms are also identified to improve off-shell amplitudes for both massless and massive fermions. ... More
Lattice Heavy Quark Effective Theory and the Isgur-Wise functionNov 28 1995We compute the Isgur-Wise function using heavy quark effective theory formulated on the lattice. The non-relativistic kinetic energy term of the heavy quark is included to the action as well as terms remaining in the infinite quark mass limit. The classical ... More
Superconductivity-insensitive order at $q$~1/4 in electron doped cupratesDec 04 2017One of the central questions in the cuprate research is the nature of the "normal state" which develops into high temperature superconductivity (HTSC). In the normal state of hole-doped cuprates, the existence of charge density wave (CDW) is expected ... More
Low temperature magnetism of gold nano particles contained in electrochemical sugar recognition systemNov 12 2018Low temperature magnetic properties were investigated on the gold nano particles (GNP) with an average size of 11.5 nm, assembled with molecules of ruthenium complex (Ru0) and phenylboronic acid (B0) by the proton nuclear resonance (1H-NMR) and susceptibility ... More
Exact absorption probabilities for the D3-braneMay 21 1998Jul 29 1999We consider a minimal scalar in the presence of a three-brane in ten dimensions. The linearized equation of motion, which is just the wave equation in the three-brane metric, can be solved in terms of associated Mathieu functions. An exact expression ... More
The asymptotic behavior of Frobenius direct images of rings of invariantsSep 09 2015We define the Frobenius limit of a module over a ring of prime characteristic to be the limit of the normalized Frobenius direct images in a certain Grothendieck group. When a finite group acts on a polynomial ring, we calculate this limit for all the ... More
ARPES studies of cuprate Fermiology: superconductivity, pseudogap, and quasiparticle dynamicsSep 01 2010We present angle-resolved photoemission spectroscopy (ARPES) studies of the cuprate high-temperature superconductors which elucidate the relation between superconductivity and the pseudogap and highlight low-energy quasiparticle dynamics in the superconducting ... More
Quot-scheme limit of Fubini-Study metrics and Donaldson's functional for bundlesSep 22 2018Mar 12 2019For a holomorphic vector bundle $E$ over a polarised K\"ahler manifold, we establish a direct link between the slope stability of $E$ and the asymptotic behaviour of Donaldson's functional, by defining the Quot-scheme limit of Fubini-Study metrics. In ... More
Anisotropic lattice actions for heavy quarkFeb 20 2003The anisotropic lattice fermion actions are investigated with the one-loop perturbative calculations aiming at constructing a formulation for heavy quark with controlled systematic uncertainties. For the heavy-light systems at rest the anisotropic lattice ... More
A numerical method of solving time-dependent Hartree-Fock-Bogoliubov equation with Gogny interactionJul 20 2007A numerical method to solve time-dependent Hartree-Fock-Bogoliubov equation is proposed to treat the case with Gogny effective interaction. To check the feasibility of the method, it is applied to oxygen isotope O20 and small amplitude oscillations are ... More
Holography and String Dynamics in Time-dependent BackgroundsAug 19 2002Nov 04 2002We study the dynamics of D-branes in a smooth time-dependent background. The theory on the branes is a time-dependent non-commutative field theory. We find the metric and fluxes that determine the dual holographic closed string theory. This provides a ... More
Upper critical fields and critical current density of BaFe2(As0.68P0.32)2 single crystalAug 23 2009May 30 2010The transport properties, upper critical fields, superconducting anisotropy, and critical current density in an iso-valent phosphorus-doped BaFe2As2 single crystal close to optimum doping are investigated in this report. Temperature dependent resistivity ... More
Hidden itinerant-spin phase in heavily-overdoped La2-xSrxCuO4 revealed by dilute Fe doping: A combined neutron scattering and angle-resolved photoemission studySep 07 2010Aug 15 2011We demonstrated experimentally a direct way to probe a hidden propensity to the formation of spin density wave (SDW) in a non-magnetic metal with strong Fermi surface nesting. Substituting Fe for a tiny amount of Cu (1%) induced an incommensurate magnetic ... More
Line nodes in the energy gap of high-temperature superconducting BaFe_2(As_{1-x}P_x)_2 from penetration depth and thermal conductivity measurementsJul 25 2009May 17 2010We report magnetic penetration depth and thermal conductivity data for high-quality single crystals of BaFe$_2$(As$_{1-x}$P$_{x}$)$_2$ ($T_c=30$\,K) which provide strong evidence that this material has line nodes in its energy gap. This is distinctly ... More
Initial Shock Waves for Explosive Nucleosynthesis in Type II SupernovaJul 02 1998We have performed 1-dimensional calculations for explosive nucleosynthesis in collapse-driven supernova and investigated its sensitivity to the initial form of the shock wave. We have found the tendency that the peak temperature becomes higher around ... More
Dynamical CP Violation in Composite Higgs ModelsDec 28 1992The dynamical origin of the CP violation in electroweak theory is investigated in composite Higgs models. The mechanism of the spontaneous CP violation proposed in other context by Dashen is adopted to construct simple models of the dynamical CP violation. ... More
Dispersion of Inferred SNe Ia/SNe II Ratios for Current Models of Supernova NucleosynthesisJul 02 1998We have estimated the dispersion of the inferred relative frequencies of Type-Ia and Type- II supernovae ($N_{Ia}/ N_{II}$) in our Galaxy by fitting the numerical results of supernova nucleosynthesis to the solar-system abundances. The ratio $N_{Ia}/ ... More
Cyclotron resonance study of quasiparticle mass and scattering rate in the hidden-order and superconducting phases of URu2Si2Oct 12 2013The observation of cyclotron resonance in ultra-clean crystals of URu2Si2 [S. Tonegawa et al., PRL 109, 036401 (2012)] provides another route besides quantum oscillations to the determination of the bulk electronic structure in the hidden order phase. ... More
Nucleosynthesis in ONeMg Novae: Models versus Observations to Constrain the Masses of ONeMg White Dwarfs and Their EnvelopesMay 21 1999Nucleosynthesis in ONeMg novae has been investigated with the wide ranges of three parameters, i.e., the white dwarf mass, the envelope mass at ignition, and the initial composition. A quasi-analytic one-zone approach is used with an up-to-date nuclear ... More
Self-triggered Model Predictive Control for Continuous-Time Systems: A Multiple Discretizations ApproachSep 08 2016In this paper, we propose a new self-triggered formulation of Model Predictive Control for continuous-time linear networked control systems. Our control approach, which aims at reducing the number of transmitting control samples to the plant, is derived ... More
Cyclotron Resonance in the Hidden-Order Phase of URu2Si2Jul 17 2012We report the first observation of cyclotron resonance in the hidden-order phase of ultra-clean URu$_2$Si$_2$ crystals, which allows the full determination of angle-dependent electron-mass structure of the main Fermi-surface sheets. We find an anomalous ... More
Duality Cascade and Oblique Phases in Non-Commutative Open String TheoryJul 24 2001Aug 07 2001We investigate the complete phase diagram of the decoupled world-sheet theory of (P,Q) strings. These theories include 1+1 dimensional super Yang-Mills theory and non-commutative open string theory. We find that the system exhibits a rich fractal phase ... More
Heavy Element Production in Inhomogeneous Big Bang NucleosynthesisJul 19 2005Dec 13 2005We present a new astrophysical site of the big bang nucleosynthesis (BBN) that are very peculiar compared with the standard BBN. Some models of the baryogenesis suggest that very high baryon density regions were formed in the early universe. On the other ... More
Fermi surface reconstruction in electron-doped cuprates without antiferromagnetic long-range orderNov 12 2018Fermi surface (FS) topology is a fundamental property of metals and superconductors. In electron-doped cuprate Nd2-xCexCuO4 (NCCO), an unexpected FS reconstruction has been observed in optimal- and over-doped regime (x=0.15-0.17) by quantum oscillation ... More
Light quark masses from unquenched lattice QCDApr 16 2007Jul 21 2008We calculate the light meson spectrum and the light quark masses by lattice QCD simulation, treating all light quarks dynamically and employing the Iwasaki gluon action and the nonperturbatively O(a)-improved Wilson quark action. The calculations are ... More
Light hadron spectrum in 2+1 flavor full QCD by CP-PACS and JLQCD CollaborationsSep 19 2004CP-PACS and JLQCD Collaborations are carrying out a joint project of the 2+1 flavor full QCD with the RG-improved gauge action and the non-perturbatively ${\cal O}(a)$-improved Wilson quark action. This simulation removes quenching effects of all three ... More
Revealing the Coulomb interaction strength in a cuprate superconductorDec 09 2017We study optimally doped Bi$_{2}$Sr$_{2}$Ca$_{0.92}$Y$_{0.08}$Cu$_{2}$O$_{8+\delta}$ (Bi2212) using angle-resolved two-photon photoemission spectroscopy. Three spectral features are resolved near 1.5, 2.7, and 3.6 eV above the Fermi level. By tuning the ... More
New Approach for Evaluating Incomplete and Complete Fusion Cross Sections with Continuum-Discretized Coupled-Channels MethodAug 27 2009We propose a new method for evaluating incomplete and complete fusion cross sections separately using the Continuum-Discretized Coupled-Channels method. This method is applied to analysis of the deuteron induced reaction on a 7Li target up to 50 MeV of ... More
Two-photon decay of $π^0$ from two-flavor lattice QCDFeb 27 2011Apr 02 2011We study the correction to the radiative $\pi^0$ decay width due to finite light quark mass. Using lattice QCD with the overlap fermion formulation, we calculate the three-point function of the form $<PV_\mu V_\nu>$ in the (Euclidean) momentum space, ... More
$π^0$ to two-photon decay in lattice QCDDec 02 2009We calculate the neutral pion ($\pi^0$) to off-shell two photon ($\gamma^*\gamma^*$) transition form factor in lattice QCD. The transition form factor can be extracted from the three-point function of the form (axial-vector)-(vector)-(vector) as a function ... More
Imaging the evolution of quantum-Hall incompressible states from the edge state to bulk-localized stateDec 25 2018Using a scanning gate technique incorporated with non-equilibrium transport, we image electrically insulating incompressible states inherent to the integer quantum Hall effect (QHE). With a reduction of the filling factor ($\nu$) to an integer $\nu$, ... More
Fermi Arcs vs. Fermi Pockets in Electron-doped Perovskite IridatesMar 19 2015We report on an angle resolved photoemission (ARPES) study of bulk electron-doped perovskite iridate, (Sr1-xLax)3Ir2O7. Fermi surface pockets are observed with a total electron count in keeping with that expected from La substitution. Depending on the ... More
Photospheric carbon and oxygen abundances of F-G type stars in the Pleiades clusterOct 18 2016In order to investigate the carbon-to-oxygen ratio of the young open cluster M45 (Pleiades), the C and O abundances of selected 32 F-G type dwarfs (in the effective temperature range of Teff~5800-7600~K and projected rotational velocity range of vesini~10-110~km/s) ... More
Observational constraints on a decaying cosmological termNov 08 2006Mar 12 2007We investigate the evolution of a universe with a decaying cosmological term (vacuum energy) that is assumed to be a function of the scale factor. In this model, while the cosmological term increases to the early universe, the radiation energy density ... More
Unambiguous pure state identification without classical knowledgeOct 03 2005Jan 13 2006We study how to unambiguously identify a given quantum pure state with one of the two reference pure states when no classical knowledge on the reference states is given but a certain number of copies of each reference quantum state are presented. By the ... More
Can the Wigner function be determined by properties for translation and parity transformation on lattice phase space?Aug 07 2002We show that the Fano operator for one dimensional quantum system is uniquely determined by assuming the reasonable behavior under translation and parity transformation on phase space. Contrarily, for the system with lattice phase space the same procedure ... More
Quantum pure-state identificationJul 25 2005Oct 27 2005We address a problem of identifying a given pure state with one of two reference pure states, when no classical knowledge on the reference states is given, but a certain number of copies of them are available. We assume the input state is guaranteed to ... More
Extended Quantum Color CodingSep 26 2004The quantum color coding scheme proposed by Korff and Kempe (quant-ph/0405086) is easily extended so that the color coding quantum system is allowed to be entangled with an extra auxiliary quantum system. It is shown that in the extended scheme we need ... More
Sp(2,$\mathbb{Z}$) invariant Wigner function on even dimensional vector spaceJan 31 2013We construct the quasi probability distribution $W(p,q)$ on even dimensional vector space with marginality and invariance under the transformation induced by projective representation of the group ${\rm Sp}(2,\mathbb{Z})$ whose elements correspond to ... More
Real-Time 6D Object Pose Estimation on CPUNov 21 2018We propose a fast and accurate 6D object pose estimation from a RGB-D image. Our proposed method is template matching based and consists of three main technical components, PCOF-MOD (multimodal PCOF), balanced pose tree (BPT) and optimum memory rearrangement ... More
Chemical Control of Spin Chirality in $(Nd_{1-x} Dy_x)_2 Mo_2 O_7$Feb 20 2004Magnetization and Hall resistivity have been investigated for single crystals of Dy-doped Nd$_{2}$Mo$_{2}$O$_{7}$. A sharp decrease of the Hall resistivity upon a metamagnetic transition, perhaps associated with magnetic-field ($H$) induced flop of Dy$^{3+}$ ... More
Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube BundlesDec 31 2006We have performed polarization-dependent ultrafast pump-probe spectroscopy of a film of aligned single-walled carbon nanotube bundles. By taking into account imperfect nanotube alignment as well as anisotropic absorption cross sections, we quantitatively ... More
P-Process Nucleosynthesis inside Supernova-Driven Supercritical Accretion DisksNov 08 2002We investigate p-process nucleosynthesis in a supercritical accretion disk around a compact object of 1.4 M_solar, using the self-similar solution of an optically thick advection dominated flow. Supercritical accretion is expected to occur in a supernova ... More
Nucleon axial and tensor charges with dynamical overlap quarksNov 14 2015We report on our calculation of the nucleon axial and tensor charges in 2+1-flavor QCD with dynamical overlap quarks. Gauge ensembles are generated at a single lattice spacing 0.12 fm and at a strange quark mass close to its physical value. We employ ... More
Dual-camera system for high-speed imaging in particle image velocimetryMar 31 2012Particle image velocimetry is an important technique in experimental fluid mechanics, for which it has been essential to use a specialized high-speed camera. However, the high speed is at the expense of other performances of the camera, i.e., sensitivity ... More
A note on Rome-Southampton Renormalization with Smeared Gauge FieldsJun 04 2013We have calculated continuum limit step scaling functions of bilinear and four-fermion operators renormalized in a Rome-Southampton scheme using various smearing prescriptions for the gauge field. Also, for the first time, we have calculated non-perturbative ... More
Applications of the Ashtekar gravity to four dimensional hyperkähler geometry and Yang-Mills InstantonsOct 10 1996Oct 22 1996The Ashtekar-Mason-Newman equations are used to construct the hyperk\"ahler metrics on four dimensional manifolds. These equations are closely related to anti self-dual Yang-Mills equations of the infinite dimensional gauge Lie algebras of all volume ... More
Nucleosynthesis inside Gamma-Ray Burst Accretion DisksMay 26 2004We investigate nucleosynthesis inside both a gamma-ray burst accretion disk and a wind launched from an inner region of the disk using one-dimensional models of the disk and wind and a nuclear reaction network. Far from a central black hole, the composition ... More
Scalar Absorption and the Breaking of the World Volume Conformal InvarianceMar 03 1998Mar 17 1998We investigate a version of fixed scalars for non-dilatonic branes which correspond to dilatations of the brane world-volume. We obtain a cross-section whose world-volume interpretation falls out naturally from an investigation of the breaking of conformal ... More
Stochastic calculation of the QCD Dirac operator spectrum with Mobius domain-wall fermionJan 05 2016We calculate the spectral function of the QCD Dirac operator using the four-dimensional effective operator constructed from the Mobius domain-wall implementation. We utilize the eigenvalue filtering technique combined with the stochastic estimate of the ... More
Word, graph and manifold embedding from Markov processesSep 18 2015Continuous vector representations of words and objects appear to carry surprisingly rich semantic content. In this paper, we advance both the conceptual and theoretical understanding of word embeddings in three ways. First, we ground embeddings in semantic ... More
Parameter dependence of the topology change and the scaling properties of the topology conserving gauge actionSep 30 2005Nov 10 2005The topology conserving gauge action proposed by Luescher is expected to reduce the number of non-smooth gauge configurations as well as the topology change compared to the conventional actions for the same lattice spacings. We report our quenched QCD ... More
A breakthrough toward wafer-size epitaxial graphene transferMay 26 2010The formation of graphene on any desirable substrate is extremely essential for the successful replacement of Si with graphene in all technological applications in the beyond-CMOS era. Recently, we observed that a Ti layer formed on epitaxial graphene ... More
Topology conserving gauge action and the overlap-Dirac operatorOct 28 2005Dec 09 2005We apply the topology conserving gauge action proposed by Luescher to the four-dimensional lattice QCD simulation in the quenched approximation. With this gauge action the topological charge is stabilized along the hybrid Monte Carlo updates compared ... More
Extracting the $η^\prime$ meson mass from gluonic correlators in lattice QCDNov 12 2015Calculation of the eta-prime meson mass is a notoriously difficult problem, as it requires evaluation of the disconnected diagram which is costly and noisy. In this work, we use a gluonic operator to extract the eta-prime state after smearing the link ... More
Analysis of (K^-,K^+) inclusive spectrum with semiclassical distorted wave modelOct 31 2006The inclusive K^+ momentum spectrum in the 12C(K^-,K^+) reaction is calculated by the semiclassical distorted wave (SCDW) model, including the transition to the \Xi^- bound state. The calculated spectra with the strength of the \Xi^--nucleus potential ... More
Unconventional electronic reconstruction in undoped (Ba,Sr)Fe$_2$As$_2$ across the spin density wave transitionSep 04 2009Through a systematic high resolution angle-resolved photoemission study of the iron pnictide compounds (Ba,Sr)Fe$_2$As$_2$, we show that the electronic structures of these compounds are significantly reconstructed across the spin density wave ordering, ... More
Non-perturbative renormalization of bilinear operators with Möbius domain-wall fermions in the coordinate spaceNov 25 2014We study the non-perturbative determination of the renormalization constants of flavor non-singlet quark bilinear operators on the lattice. The renormalization condition is imposed on correlation functions of bilinear operators in the coordinate space. ... More
Perturbative calculation of O(a) improvement coefficientsAug 01 2002We compute several coefficients needed for O(a) improvement of currents in perturbation theory, using the Brodsky-Lepage-Mackenzie prescription for choosing an optimal scale q*. We then compare the results to non-perturbative calculations. Normalization ... More
Application of heavy-quark effective theory to lattice QCD: III. Radiative corrections to heavy-heavy currentsDec 20 2001We apply heavy-quark effective theory (HQET) to separate long- and short-distance effects of heavy quarks in lattice gauge theory. In this paper we focus on flavor-changing currents that mediate transitions from one heavy flavor to another. We stress ... More
Width difference in the $B_s$-$\bar{B}_s$ system with lattice NRQCDDec 13 1999Apr 22 2000We compute the matrix element of the four-quark operator $\Op_S$ = $\bar{b}(1-\gamma_5) s \bar{b} (1-\gamma_5) s$ in the $B_s-\bar{B}_s$ mixing on the lattice using NRQCD, which gives a leading contribution in the calculation of the width difference $\Delta\Gamma_s$ ... More
Metric recovery from directed unweighted graphsNov 20 2014We analyze directed, unweighted graphs obtained from $x_i\in \mathbb{R}^d$ by connecting vertex $i$ to $j$ iff $|x_i - x_j| < \epsilon(x_i)$. Examples of such graphs include $k$-nearest neighbor graphs, where $\epsilon(x_i)$ varies from point to point, ... More
Determination of S17 from 8B breakup by means of the method of continuum-discretized coupled-channelsMay 03 2005Feb 17 2006The astrophysical factor for 7Be(p,\gamma)8B at zero energy, S17(0), is determined from an analysis of 208Pb(8B, p+7Be)208Pb at 52 MeV/nucleon by means of the method of continuum-discretized coupled-channels (CDCC) taking account of all nuclear and Coulomb ... More
Lower Critical Fields of Superconducting PrFeAsO$_{1-y}$ Single CrystalsNov 22 2008Jan 14 2009We have studied the lower critical fields H_{c1} of superconducting iron oxipnictide PrFeAsO_{1-y} single crystals for H parallel and perpendicular to the ab-planes. Measurements of the local magnetic induction at positions straddling the sample edge ... More
Adiabatic measurements of magneto-caloric effects in pulsed high magnetic fields up to 55 TFeb 12 2013Magneto-caloric effects (MCEs) measurement system in adiabatic condition is proposed to investigate the thermodynamic properties in pulsed magnetic fields up to 55 T. With taking the advantage of the fast field- sweep rate in pulsed field, adiabatic measurements ... More
Big-bang nucleosynthesis in Brans-Dicke cosmology with a varying $Λ$ term related to WMAPSep 05 2005We investigate the big-bang nucleosynthesis in a Brans-Dicke model with a varying $\Lambda$ term using the Monte-Carlo method and likelihood analysis. It is found that the cosmic expansion rate differs appreciably from that of the standard model. The ... More
Star Formation in Las Campanas Compact GroupsJul 11 1999Compact groups (CGs) of galaxies offer an exceptional laboratory for the study of dense galaxian environments --- where interactions, tidally induced activity, and mergers are expected to be at their highest rate of occurrence. Here, we present first ... More
From random walks to distances on unweighted graphsNov 02 2015Large unweighted directed graphs are commonly used to capture relations between entities. A fundamental problem in the analysis of such networks is to properly define the similarity or dissimilarity between any two vertices. Despite the significance of ... More
Monopoles and Dyons in Non-Commutative GeometrySep 28 1999Oct 27 1999Taking advantage of the equivalence between supersymmetric Yang-Mills theory on non-commutative spaces and the field theory limit of D3-branes in the background of NSNS 2-form field, we investigate the static properties of magnetic monopoles and dyons ... More
Convergence rate of stability problems of SDEs with (dis-)continuous coefficientsJan 18 2014Apr 02 2014We consider the stability problems of one dimensional SDEs when the diffusion coefficients satisfy the so called Nakao-Le Gall condition. The explicit rate of convergence of the stability problems are given by the Yamada-Watanabe method without the drifts. ... More
Properties of resonant states in 18Ne relevant to key 14O(alpha,p)17F breakout reaction in type I x-ray burstsMar 10 2014The $^{14}$O($\alpha$,$p$)$^{17}$F reaction is one of the key reactions involved in the breakout from the hot-CNO cycle to the rp-process in type I x-ray bursts. The resonant properties in the compound nucleus $^{18}$Ne have been investigated through ... More
High Ratio of 44Ti/56Ni in Cas A and Axisymmetric Collapse-Driven Supernova ExplosionJul 02 1998The large abundance ratio of $^{44}Ti/^{56}Ni$ in Cas A is puzzling. In fact, the ratio seems to be larger than the theoretical constraint derived by Woosley & Hoffman (1991). However, this constraint is obtained on the assumption that the explosion is ... More
Spectroscopic evidence for negative electronic compressibility in a quasi-three-dimensional spin-orbit correlated metalSep 29 2014Apr 26 2015Negative compressibility is a sign of thermodynamic instability of open or non-equilibrium systems. In quantum materials consisting of multiple mutually coupled subsystems, the compressibility of one subsystem can be negative if it is countered by positive ... More
Phase competition in trisected superconducting domeSep 28 2012A detailed phenomenology of low energy excitations is a crucial starting point for microscopic understanding of complex materials such as the cuprate high temperature superconductors. Because of its unique momentum-space discrimination, angle-resolved ... More
The anti-B --> D* lepton anti-neutrino form factor at zero recoil and the determination of V(cb)Oct 24 2001We summarize our lattice QCD study of the form factor at zero recoil in the decay anti-B --> D* lepton anti-neutrino. After careful consideration of all sources of systematic uncertainty, we find, h_A1(1) = 0.913(+0.024-0.017)(+0.017-0.030), where the ... More
Doping dependence of the $(π,π)$ shadow band in La-based cuprates studied by angle-resolved photoemission spectroscopyNov 11 2009Dec 13 2010The $(\pi,\pi)$ shadow band (SB) in La-based cuprate family (La214) was studied by angle-resolved photoemission spectroscopy (ARPES) over a wide doping range from $x=0.01$ to $x=0.25$. Unlike the well-studied case of the Bi-based cuprate family, an overall ... More
On three consecutive primesSep 24 2009In this paper, we prove certain theorems about three consecutive primes.
Quantisation of extremal Kähler metricsAug 11 2015Suppose that a polarised K\"ahler manifold $(X,L)$ admits an extremal metric $\omega$. We prove that there exists a sequence of K\"ahler metrics $\{ \omega_k \}_k$, converging to $\omega$ as $k \to \infty$, each of which satisfies the equation $\bar{\partial} ... More
Corrections to D-brane Action and Generalized Boundary StateSep 06 1999Oct 05 1999In this paper, we generalize a boundary state to the one incorporating non-constant gauge field strength as an external background coupled to the boundary of a string worldsheet in bosonic string theory. This newly defined boundary state satisfies generalized ... More
Multigame Effect in Finite Populations Induces Strategy Linkage Between Two GamesMay 31 2013Evolutionary game dynamics with two 2-strategy games in a finite population has been investigated in this study. Traditionally, frequency-dependent evolutionary dynamics are modeled by deterministic replicator dynamics under the assumption that the population ... More
Composite Z'Sep 17 2014Nov 23 2014We investigate a possibility of a composite Z' vector boson. For the compositeness, the required gauge coupling g in low energy is not so big, g^2/(4\pi) > 0.015 in the case of the U(1)_{B-L} model. We show that the Stueckelberg model is effectively induced ... More
Constraints on Mass Spectrum of Fourth Generation Fermions and Higgs BosonsJan 25 2010Mar 31 2010We reanalyze constraints on the mass spectrum of the chiral fourth generation fermions and the Higgs bosons for the standard model (SM4) and the two Higgs doublet model (THDM). We find that the Higgs mass in the SM4 should be larger than roughly the fourth ... More
Stueckelberg model and Composite Z'Apr 30 2015Based on Ref.[1], we study a composite Z' model which effectively induces the Stueckelberg model in low energy. It turns out that the mass of the composite Z' boson contains the Stueckelberg mass term in sharp contrast to the conventional Z' model. We ... More
Scenarios with Composite Higgs BosonsApr 18 2013Typical models with composite Higgs bosons are briefly reviewed. We also introduce the isospin symmetric Higgs model recently proposed in Ref. 1.
Scalar Decay Constant and Yukawa Coupling in Walking Technicolor ModelsFeb 27 2012Based on Refs.1 and 2, we study the couplings of the scalar bound state to the fermions and the weak bosons in walking gauge theories.
Topcolor model in extra dimensions and nontrivial boundary conditionsFeb 28 2005The nontrivial boundary conditions for the Topcolor breaking are investigated in the context of the TeV-scale extra dimension scenario. We present a six dimensional model where the top and bottom quarks in the bulk have the Topcolor charge while the other ... More
The Higgs Boson Mass and Ward-Takahashi Identity in Gauged Nambu-Jona-Lasinio ModelMay 07 1998Jul 28 1998A new formula for the composite Higgs boson mass is given, based on the Ward-Takahashi identity and the Schwinger-Dyson(SD) equation. In this formula the dominant asymptotic solution of the SD equation yields a correct answer, in sharp contrast to the ... More
Topcolor Dynamics and The effective gluon-gluon-Higgs OperatorJan 13 2002Oct 04 2002We discuss the production of the composite Higgs boson in topcolor models via the gluon fusion process. We consider the contribution of color-octet massive gauge bosons (colorons) strongly interacting with the top quark, in addition to nonstandard contributions ... More
Action of Singular Instantons of Hawking-Turok TypeMay 11 2000Using Kaluza-Klein technique we show that the singularity of Hawking-Turok type has a fixed point (bolt) contribution to the action in addition to the usual boundary contribution. Interestingly by adding this contribution we can obtain a simple expression ... More
Observation of Spin-Orbit Berry's Phase in Magnetoresistance of a Two-Dimensional Hole Anti-dot SystemApr 05 2007We report observation of spin-orbit Berry's phase in the Aharonov-Bohm (AB) type oscillation of weak field magnetoresistance in an anti-dot lattice (ADL) of a two-dimensional hole system. An AB-type oscillation is superposed on the commensurability peak, ... More
Equivariant class group. II. Enriched descent theoremMar 19 2014We prove a version of Grothendieck's descent theorem on an `enriched' principal fiber bundle, a principal fiber bundle with an action of a larger group scheme. Using this, we prove the isomorphisms of the equivariant Picard and the class groups arising ... More
Scalar curvature and Futaki invariant of Kähler metrics with cone singularities along a divisorAug 11 2015Nov 20 2017We study the scalar curvature of K\"ahler metrics that have cone singularities along a divisor, with a particular focus on certain specific classes of such metrics that enjoy some curvature estimates. Our main result is that, on the projective completion ... More
Existence of twisted constant scalar curvature Kähler metrics with a large twistAug 03 2015Suppose that there exist two K\"ahler metrics $\omega$ and $\alpha$ such that the metric contraction of $\alpha$ with respect to $\omega$ is constant, i.e. $\Lambda_{\omega} \alpha = \text{const}$. We prove that for all large enough $R>0$ there exists ... More
A twisted moment map and its equivarianceFeb 08 2011Mar 19 2013Let $G$ be a linear connected complex reductive Lie group. The purpose of this paper is to give explicit symplectic isomorphisms from twisted cotangent bundles of the complex generalized flag varieties, whose transition functions are given by affine transformations ... More