Results for "S. Hashimoto"

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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
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
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
Moduli of surface diffeomorphisms with cubic tangenciesApr 23 2018In this paper, we study conjugacy invariants for 2-dimensional diffeomorphisms with homoclinic cubic tangencies (two-sided tangencies of the lowest order) under certain open conditions. Ordinary arguments used in past studies of conjugacy invariants associated ... More
Finite Symplectic Actions on the K3 LatticeDec 13 2010Feb 07 2013In this paper, we study finite symplectic actions on K3 surfaces X, i.e. actions of finite groups G on X which act on H^{2,0}(X) trivially. We show that the action on the K3 lattice H^2(X,Z) induced by a symplectic action of G on X depends only on G up ... More
Dynamical Electroweak Symmetry Breaking and Fourth FamilyFeb 27 2010We propose a dynamical model with a (2 + 1)-structure of composite Higgs doublets: two nearly degenerate composites of the fourth family quarks t' and b', $\Phi_{t^{\prime}} \sim \bar{t^{\prime}}_{R}(t^{\prime},b^{\prime})_L$ and $\Phi_{b^{\prime}} \sim ... More
Charmonium spectroscopy with heavy Kogut-Susskind quarksNov 26 1994Charmonium spectroscopy with Kogut-Susskind valence quarks are carried out for quenched QCD at $\beta=6.0$ and for two-flavor full QCD at $\beta=5.7$. Results for 1P--1S mass splitting and estimates of $\alpha^{(5)}_{\overline{MS}}(m_Z)$ are reported. ... More
"Geometric quotients are algebraic schemes" based on Fogarty's ideaMar 12 2003Sep 13 2004Let S be a Noetherian scheme, f:X->Y a surjective S-morphism of S-schemes, with X of finite type over S. We discuss what makes Y of finite type. First, we prove that if S is excellent, Y is reduced, and f is universally open, then Y is of finite type. ... More
A pure subalgebra of a finitely generated algebra is finitely generatedJun 15 2004We prove the following. Let $R$ be a Noetherian ring, $B$ a finitely generated $R$-algebra, and $A$ a pure $R$-subalgebra of $B$. Then $A$ is finitely generated over $R$.
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
F(1) for B -> D^*lνfrom Lattice QCDJul 09 2002Short description of our calculation of the form factor needed to determine CKM element |V_{cb}| from the exclusive decay B -> D^*l\nu. For full details, see hep-ph/0110253. Also, here we recommend distribution for CKM fits.
Application of heavy-quark effective theory to lattice QCD: II. Radiative corrections to heavy-light currentsDec 20 2001Dec 30 2004We apply heavy-quark effective theory to separate long- and short-distance effects of heavy quarks in lattice gauge theory. In this approach, the inverse heavy-quark mass and the lattice spacing are treated as short distances, and their effects are lumped ... 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
The B -> D* l nu Form Factor at Zero RecoilOct 13 1999We describe a model independent lattice QCD method for determining the deviation from unity for h_{A1}(1), the B -> D* l nu form factor at zero recoil. We extend the double ratio method previously used to determine the B -> D l nu form factor. The bulk ... More
B -> pi l nu at three lattice spacingsOct 20 1998The increasing accuracy of experimental results for the exclusive, semileptonic decay B -> pi l nu requires a similarly accurate calculation of the hadronic matrix elements, to determine |Vub|. We present preliminary results for the form factors of the ... 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
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
Calabi-Yau threefolds of type K (I): ClassificationSep 26 2014Feb 04 2016Any Calabi-Yau threefold X with infinite fundamental group admits an \'etale Galois covering either by an abelian threefold or by the product of a K3 surface and an elliptic curve. We call X of type A in the former case and of type K in the latter case. ... 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
About J-flow, J-balanced metrics, uniform J-stability and K-stabilityMay 04 2017Jul 04 2017From the work of Dervan-Keller, there exists a quantization of the critical equation for the J-flow. This leads to the notion of J-balanced metrics. We prove that the existence of J-balanced metrics has a purely algebro-geometric characterization in terms ... More
A variational approach to the Hermitian-Einstein metrics and the Quot-scheme limit of Fubini-Study metricsJul 12 2019This is a sequel of our paper [arXiv:1809.08425] on the Quot-scheme limit and variational properties of Donaldson's functional, which established its coercivity for slope stable holomorphic vector bundles over smooth projective varieties. Assuming that ... More
$T \bar{T},J \bar T$, $T \bar{J}$ Partition Sums From String TheoryJul 16 2019We calculate the torus partition sum of a general $CFT_2$ with left and right moving conserved currents $J$ and $\bar J$, perturbed by a combination of the irrelevant operators $T\bar T$, $J\bar T$ and $T\bar J$. We use string theory techniques to write ... 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
Calabi-Yau threefolds of type K (II): Mirror symmetryNov 27 2015Jun 20 2016A Calabi-Yau threefold is called of type K if it admits an \'etale Galois covering by the product of a K3 surface and an elliptic curve. In our previous paper, based on Oguiso-Sakurai's fundamental work, we provide the full classification of Calabi-Yau ... More
Period map of a certain K3 family with an S5-actionApr 01 2009In this paper, we study the period map of a certain one-parameter family of quartic K3 surfaces with an S5-action. We construct automorphic forms on the period domain as the pull-backs of theta constants of genus 2 by a modular embedding. Using these ... More
CP-PACS Result for the Quenched Light Hadron SpectrumSep 29 1997The quenched hadron spectrum in the continuum obtained with the Wilson quark action in recent simulations on the CP-PACS is presented. Results for the light quark masses and the QCD scale parameter are reported.
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
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
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
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
Matrix Model Approach to $d>2$ Non-critical SuperstringsJul 10 1995We apply light-cone quantization to a $1+1$ dimensional supersymmetric field theory of large N matrices. We provide some preliminary numerical evidence that when the coupling constant is tuned to a critical value, this model describes a 2+1 dimensional ... More
Decay of Excited D-branesApr 12 1996We calculate the leading order interactions of massless D-brane excitations. Their 4-point functions are found to be identical to those found in type I theory. The amplitude for two massless D-brane fluctuations to produce a massless closed string is ... More
Non-Perturbative Solution of Matrix Models Modified by Trace-Squared TermsSep 12 1994We present a non-perturbative solution of large $N$ matrix models modified by terms of the form $ g(\Tr\Phi^4)^2$, which add microscopic wormholes to the random surface geometry. For $g<g_t$ the sum over surfaces is in the same universality class as the ... More
Dynamics behind the quark mass hierarchyJan 28 2009Jul 09 2009We introduce a new class of models describing the quark mass hierarchy. In this class, the dynamics primarily responsible for electroweak symmetry breaking (EWSB) leads to the mass spectrum of quarks with no (or weak) isospin violation. Moreover, the ... 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
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
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
Topological susceptibility of QCD with dynamical Möbius domain wall fermionsMay 31 2017Nov 29 2018We compute the topological susceptibility $\chi_t$ of lattice QCD with $2+1$ dynamical quark flavors described by the M\"obius domain wall fermion. Violation of chiral symmetry as measured by the residual mass is kept at $\sim$1 MeV or smaller. We measure ... More
Probing microscopic structures of quantum Hall incompressible phases: Filling-factor-dependent evolution contributing to quantum Hall effectsDec 25 2018Jun 23 2019The integer quantum Hall (QH) effects characterized by topologically quantized and nondissipative transport are caused by an electrically insulating incompressible phase that prevents backscattering between chiral metallic channels. Using a scanning gate ... 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
The socle filtrations of principal series representations of $SL(3,\mathbb{R})$ and $Sp(2,\mathbb{R})$Feb 20 2017We study the structure of the $(\mathfrak{g},K)$-modules of the principal series representations of $SL(3,\mathbb{R})$ and $Sp(2,\mathbb{R})$ induced from minimal parabolic subgroups, in the case when the infinitesimal character is nonsingular. The composition ... 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
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
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
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
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
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
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
Anomalous Hall Effect in ZrTe5Dec 21 2016Sep 20 2017ZrTe$_5$ has been of recent interest as a potential Dirac/Weyl semimetal material. Here, we report the results of experiments performed via in-situ 3D double-axis rotation to extract the full $4\pi$ solid angular dependence of the transport properties. ... 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
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
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
Direct observation of bulk charge modulations in optimally-doped Bi$_{1.5}$Pb$_{0.6}$Sr$_{1.54}$CaCu$_{2}$O$_{8+δ}$Mar 01 2014Jul 01 2014Bulk charge density modulations, recently observed in high critical-temperature ($T_\mathrm{c}$) cuprate superconductors, coexist with the so-called pseudogap and compete with superconductivity. However, its direct observation has been limited to a narrow ... More
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
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
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
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
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
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
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
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
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
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
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
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
D meson semileptonic decays in lattice QCD with Moebius domain-wall quarksJan 04 2017We report on our study of the D meson semileptonic decays in 2+1 flavor lattice QCD. Gauge ensembles are generated at three lattice cutoffs up to 4.5 GeV and with pion masses as low as 300 MeV. We employ the Moebius domain-wall fermion action for both ... 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
Momentum Dependence of the Nematic Order Parameter in Iron-Based SuperconductorsAug 07 2019The momentum dependence of the nematic order parameter is an important ingredient in the microscopic description of iron-based high-temperature superconductors. While recent reports on FeSe indicate that the nematic order parameter changes sign between ... 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
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
Mitigating the effects of charged particle strikes on TES arrays for exotic atom X-ray experimentsJul 14 2019Exotic atom experiments place transition-edge-sensor (TES) microcalorimeter arrays in a high-energy charged particle rich environment. When the high-energy charged particle passes through the silicon substrate of a TES array, a large amount of energy ... More
Asteroseismological Observations of the Central Star of the Planetary Nebula NGC 1501Sep 04 1996Sep 06 1996We report on a global CCD time-series photometric campaign to decode the pulsations of the nucleus of the planetary nebula NGC1501. The star is hot and hydrogen-deficient, similar to the pre-white-dwarf PG 1159 stars. NGC1501 shows pulsational brightness ... More
14Be(p,n)14B reaction at 69 MeV in inverse kinematicsFeb 17 2011Mar 03 2011A Gamow-Teller (GT) transition from the drip-line nucleus 14Be to 14B was studied via the (p,n) reaction in inverse kinematics using a secondary 14Be beam at 69 MeV/nucleon. The invariant mass method is employed to reconstruct the energy spectrum. A peak ... More
Enhanced Higgs diphoton rate and isospin symmetric Higgs bosonMar 26 2013Based on Ref.1, we introduce a model with an isospin symmetric Higgs boson and study the properties of this particle, including the enhancement of its diphoton decay rate. The predictions of the model relevant for future experiments are also discussed. ... More
Isospin Breaking Effects in the Anomalous Processes with Vector MesonsFeb 19 1996We introduce isospin breaking terms as well as (SU(3)) breaking terms to the anomalous (VVP) coupling in the hidden local symmetry scheme without affecting the low energy theorem on the processes such as (\pi\to 2 \gamma) and (\gamma\to 3\pi ). It is ... More
Manifestation of Instabilities in Nambu-Jona-Lasinio type modelsMay 29 2006Sep 12 2006We study a Nambu-Jona-Lasinio (NJL) type model with two-flavor quark matter in $\beta$-equilibrium. It turns out that the system develops instabilities in the dispersion relations of the diquark fields, i.e., the velocity squared $v^2$ becomes negative ... More
Noncommutativity vs. Transversality in QED in a strong magnetic fieldJul 07 2005Jul 18 2005Quantum electrodynamics (QED) in a strong constant magnetic field is investigated from the viewpoint of its connection with noncommutative QED. It turns out that within the lowest Landau level (LLL) approximation the 1-loop contribution of fermions provides ... More
Perturbative Dynamics of Fractional Strings on Multiply Wound D-stringsOct 31 1996Fractional strings in the spectrum of states of open strings attached to a multiply wound D-brane is explained. We first describe the fractional string states in the low-energy effective theory where the topology of multiple winding is encoded in the ... More
Dynamics of Dirichlet-Neumann Open Strings on D-branesAug 20 1996Method for computing scattering amplitudes of open strings with Dirichlet boundary on one end and Neumann boundary condition on the other is described. Vertex operator for these states are constructed using twist fields which have been studied previously ... More
Scalar curvature and Futaki invariant of Kähler metrics with cone singularities along a divisorAug 11 2015We study the scalar curvature of K\"ahler metrics that have cone singularities along a divisor, with a particular focus on two classes of such metrics that enjoy some nice properties: momentum-constructed conically singular metrics and the metrics of ... More
Another proof of global $F$-regularity of Schubert varietiesSep 01 2004Recently, Lauritzen, Raben-Pedersen and Thomsen proved that Schubert varieties are globally $F$-regular. We give another proof.
Linear Responses in Time-dependent Hartree-Fock-Bogoliubov Method with Gogny InteractionMar 28 2012A numerical method to integrate the time-dependent Hartree-Fock Bogoliubov (TDHFB) equations with Gogny interaction is proposed. The feasibility of the TDHFB code is illustrated by the conservation of the energy, particle numbers, and center-of-mass in ... More
Mapping properties of the Hilbert and Fubini--Study maps in Kähler geometryMay 31 2017Jun 26 2018Suppose that we have a compact K\"ahler manifold $X$ with a very ample line bundle $\mathcal{L}$. We prove that any positive definite hermitian form on the space $H^0 (X,\mathcal{L})$ of holomorphic sections can be written as an $L^2$-inner product with ... More
On the principal symbols of $K_{\mathbb C}$-invariant differential operators on Hermitian symmetric spacesApr 25 2008Let $(G,K)$ be one of the following classical irreducible Hermitian symmetric pairs of noncompact type: $(SU(p,q), S(U(p) \times U(q))),(Sp(n,R), U(n))$, or $(SO*(2n), U(n))$. Let $G_{\mathbb C}$ and $K_{\mathbb C}$ be complexifications of $G$ and $K$, ... More
Possibility of ferromagnetic neutron matterDec 22 2014Jan 13 2015We study ferromagnetism at high density of neutrons in the QCD hadron phase, by using the simplest chiral effective model incorporating magnetic fields and the chiral anomaly. Under the assumption of spatial homogeneity, we calculate the energy density ... More
Holographic Nuclei : Supersymmetric ExamplesOct 13 2009Nov 15 2009We provide a dual gravity description of a supersymmetric heavy nucleus, following the idea of our previous paper arXiv:0809.3141. The supersymmetric nucleus consists of a merginal bound state of $A$ baryons distributed over a ball in 3 dimensions. In ... More
The shape of nonabelian D-branesJan 08 2004Jan 29 2004We evaluate bulk distribution of energies, pressures and various D-brane/F-string charges generated by nontrivial matrix configurations in nonabelian D-brane effective field theories, using supergravity source density formulas derived originally in Matrix ... More
Born-Infeld Dynamics in Uniform Electric FieldMay 22 1999Jun 09 1999We investigate various properties of classical configurations of the Born-Infeld theory in a uniform electric field. This system is involved with dynamics of (F,Dp) bound states, which are bound states of fundamental strings and Dp-branes. The uniform ... More
Non-Linear/Non-Commutative Non-Abelian MonopolesJul 26 2001Using recently proposed non-linearly realized supersymmetry in non-Abelian gauge theory corrected to the order (alpha')^2, we derive the non-linear BPS equations in the background B-field for the U(2) monopoles and instantons. We show that these non-Abelian ... More
On a certain relation between Legendre's conjecture and Bertrand's postulateJul 23 2008Aug 08 2008We prove a certain relation between Legendre's conjecture and Bertrand's postulate in terms of a certain transformation of Legendre's function phi. We show a certain property of a prime.