A5102879209- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Physics of Superconductivity and Magnetism
- Particle physics theoretical and experimental studies
- Cold Atom Physics and Bose-Einstein Condensates
- Theoretical and Computational Physics
- Quantum and electron transport phenomena
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Advanced Condensed Matter Physics
- Atomic and Subatomic Physics Research
- Neural Networks and Applications
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Nuclear physics research studies
- Black Holes and Theoretical Physics
- High-pressure geophysics and materials
- Neural dynamics and brain function
- Magnetic properties of thin films
- Quantum Mechanics and Applications
- Advanced NMR Techniques and Applications
- Pulsars and Gravitational Waves Research
- Neural Networks and Reservoir Computing
- Laser-Plasma Interactions and Diagnostics
- Quantum chaos and dynamical systems
Tokyo Institute of Technology
2023
Kindai University
2008-2018
The University of Tokyo
1995-2014
Nagoya Institute of Technology
2008
Tokyo Metropolitan Komaba High School
2002
Kyoto University
1998-1999
Institut de Physique
1997
California Institute of Technology
1985-1994
Nagoya University
1979-1994
Massachusetts Institute of Technology
1986-1992
The mechanism of energy deposition and matter formation in the central rapidity region ultra- relativistic nucleus-nucleus collisions is studied terms flux-tube model. This model assumes that two Lorentz-contracted nuclei are color charged at instant collision by a random exchange. strong color-electric field confined between capacitor plates will immediately begin to polarize vacuum making qq\ifmmode\bar\else\textasciimacron\fi{} gluon pairs quanta excited system may form rapidly expanding...
Schwinger's result for the rate of pair creation in a uniform external field has been transcribed previously into QCD. We reexamine this problem. The mutual interaction pari and strict energy conservation (which were implicitly neglected by Schwinger), while generally negligible QED, are major importance In picture color confinement tube we derive new which is free these defects.
We develop a kinetic theory of chemical reactions in quark-gluon plasma order to study the evolution flavor composition ultrarelativistic nucleus-nucleus collisions. The rates production and annihilation strange-quark pairs are computed lowest perturbation assuming local equilibrium with respect other, more frequent collision processes. Quantum-statistical effects taken into account. hydrodynamic equations coupled rate equation derived solved numerically homogeneous plasma, simulating...
The relation between the rapidity density of produced particles in ultrarelativistic nuclear collisions and maximum proper energy ${\ensuremath{\epsilon}}_{0}$ is derived. new scaling hydrodynamic equations Bjorken, Kajantie, McLerran are employed. results exceed earlier estimates obtained with inside-outside cascade models provide an independent estimate from collision data. We also derive a lower bound on incorporating viscous heating first-order phase transition quark hadronic phases....
We present a theoretical study of quantum simulations $(1+1)$-dimensional U(1) lattice gauge-Higgs models, which contain compact gauge field and Higgs matter field, by using ultra-cold bosonic gases on one-dimensional optical lattice. Starting from the extended Bose-Hubbard model with on-site nearest-neighbor interactions, we derive as low-energy effective theory. The derived exhibits nontrivial phase transitions between confinement phases, discuss relation transition in model. Finally,...
We discuss the central rapidity region of high-energy proton-nucleus collisions in context a flux-tube model. This model supposes creation color flux tube by random-walk color-charging process and its subsequent decay qq\ifmmode\bar\else\textasciimacron\fi{} gluon-pair creation. The observed dependence particle multiplicity on number \ensuremath{\nu} projectile interactions is explained. Some further implications for nucleus-nucleus collisions, including A latter case, are discussed.
Recently, the possibility of quantum simulation dynamical gauge fields was pointed out by using a system cold atoms trapped on each link in an optical lattice. However, to implement exact local invariance, fine-tuning interaction parameters among is necessary. In present paper, we study effect violation U(1) invariance relaxing and showing that wide variety still be faithful simulator for gauge-Higgs model containing Higgs field sitting sites. Clarification dynamics this sheds some lights...
We calculate the transverse-momentum dependence of J/\ensuremath{\psi} suppression in ultrarelativistic heavy-ion collisions, assuming existence a characteristic energy density ${\ensuremath{\epsilon}}_{s}$ above which no could be formed. Bjorken's longitudinal-scaling hydrodynamics is used to describe system central rapidity region. The observed recent CERN NA38 experiment colliding 200-GeV/nucleon oxygen on uranium can understood our model if...
Bjorken's hydrodynamic description of the space-time evolution central rapidity region in ultrarelativistic heavy-ion collisions is extended to incorporate chemical processes which affect strangeness abundance. Scaling equations contain rate equation for production and annihilation both plasma phase hadron gas are integrated numerically assuming an almost adiabatic first-order transition from gas. It found that if a initially formed resultant K/\ensuremath{\pi} ratio will be enhanced by...
We study the crossover between two- and three-dimensional behaviors of Villain form XY spin model on a lattice with anisotropic couplings ${\mathit{J}}_{1}$=${\mathit{J}}_{2}$=J, ${\mathit{J}}_{3}$=\ensuremath{\alpha}J (0\ensuremath{\le}\ensuremath{\alpha}\ensuremath{\le}1). The \ensuremath{\alpha} dependence various quantities is examined by means duality transformations, Migdal renormalization group, Monte Carlo simulations. For specific heat, into Kosterlitz-Thouless behavior takes place...
The reaction \ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}${\ensuremath{\pi}}^{0}$\ensuremath{\eta} has been investigated with the Crystal Ball detector at DESY storage ring DORIS II. Formation of \ensuremath{\delta}(980) and ${A}_{2}$(1320) observed \ensuremath{\gamma}\ensuremath{\gamma} partial widths ${\ensuremath{\Gamma}}_{\ensuremath{\gamma}\ensuremath{\gamma}}$(${A}_{2}$)=1.14\ifmmode\pm\else\textpm\fi{}0.20\ifmmode\pm\else\textpm\fi{}0.2 6 keV...
We investigate dynamical plasma screening effects on a heavy-quark--antiquark pair traversing quark-gluon plasma. The screened potential created by test charge (heavy quark) moving in the medium is calculated frame solving transport equation for collisionless ultrarelativistic interacting via Abelian gauge field. It shown that becomes strongly anisotropic as velocity of increases. Possible implications this effect charmonium production relativistic heavy-ion collisions are discussed.
Lattice gauge theory has provided a crucial non-perturbative method in studying canonical models high-energy physics such as quantum chromodynamics. Among other of lattice theory, the gauge–Higgs model is quite important one because it describes wide variety phenomena/models related to Anderson–Higgs mechanism, superconductivity, standard particle physics, and inflation process early Universe. In this paper, we first show that atomic description allows us explore real-time dynamics variables...
We study the slave-boson $t\ensuremath{-}J$ model of cuprates with high superconducting transition temperatures, and derive its low-energy effective field theory for charge-spin separated state in a self-consistent manner. The phase degrees freedom mean hoppings holons spinons can be regarded as U(1) gauge field, ${A}_{i}.$ separation occurs below certain temperature, ${T}_{\mathrm{CSS}},$ deconfinement phenomenon dynamics Below temperature ${T}_{\mathrm{SG}}(<{T}_{\mathrm{CSS}}),$...
In this paper we study a 3D lattice spin model of CP$^1$ Schwinger-bosons coupled with dynamical compact U(1) gauge bosons. The contains two parameters; the coupling and hopping parameter At large (weak) couplings, reduces to classical O(3) (O(4)) long-range and/or multi-spin interactions. It is also closely related recently proposed "Ginzburg-Landau" theory for quantum phase transitions $s=1/2$ systems on 2D square at zero temperature. We numerically structure by calculating specific heat,...