The 3-state Potts model as a heavy quark finite density laboratory (2005)
Kim, Seyong, De Forcrand, Ph., Kratochvila, S., Takaishi, T.
The 3-D Z(3) Potts model is a model for finite temperature QCD with heavy quarks. The chemical potential in QCD becomes an external magnetic field in the Potts model. Following Alford et...
Testing and tuning new symplectic integrators for Hybrid Monte Carlo algorithm in lattice QCD (2005)
Takaishi, T, De Forcrand, Philippe
We examine a new 2nd order integrator recently found by Omelyan et al. The integration error of the new integrator measured in the root mean square of the energy difference, $\bra\Delta...
Properties of hadron screening masses at small baryonic density (2004)
De Forcrand, Ph., Perez, M. Garcia, Kim, S., Matsufuru, H., Nakamura, A., ...
The properties of hadron screening masses around the deconfinement phase transition at finite baryonic density can be studied by evaluating the Taylor coefficients with respect to the iso-scalar and...
Contribution of disconnected diagrams to the hyperfine splitting of charmonium (2004)
De Forcrand, Philippe, Pérez-Garcia, M, Matsufuru, H, Nakamura, A, Pushkina, I, Stamatescu, I O, ...
We discuss the contribution of OZI-suppressed diagrams to the hyperfine splitting of charmonium in lattice QCD. We study valence quark mass regions from strange to charm quark masses. No contribution...
Diagnosis of Combustion with Water Injection using High Speed Visualisation and CFD (2004)
Tajima, H, Takasaki, K, Goldsworthy, LC, Takaishi, T, Strom, A, Masuda, R
Simulation of Wilson fermion at finite isospin density (2003)
For QCD with Wilson fermions at isospin chemical potential we study the finite phase transition on an $8^3\times4$ lattice at $\kappa=0.15$. We use two gauge actions: Wilson action and DBW2 action....
Phase Fluctuation of Fermion Determinant in Lattice QCD at Finite Density (2003)
Sasai, Y., Nakamura, A., Takaishi, T.
Once the quark chemical potential $\mu$ is introduced in finite density QCD, the fermion determinant appeared in the path integral measure becomes complex. In order to investigate the phase effect of...
Quenched charmonium spectrum (2003)
Choe, S, Liu, Y, Nakamura, A, Pérez-Garcia, M, Stematescu, I O, Takaishi, T, ...
We study charmonium using the standard relativistic formalism in the quenched approximation, on a set of lattices with isotropic lattice spacings ranging from 0.1 to 0.04 fm. We concentrate on the...
Quenched charmonium spectrum (2003)
Choe, S., De Forcrand, Ph., Perez, M. Garcia, Liu, Y., Nakamura, A., ...
We study charmonium using the standard relativistic formalism in the quenched approximation, on a set of lattices with isotropic lattice spacings ranging from 0.1 to 0.04 fm. We concentrate on the...
QCD simulations at small chemical potential (2002)
De Forcrand, Philippe, Kim, S, Takaishi, T
Within the reweighting approach, one has the freedom to choose the Monte Carlo action so that it provides a good overlap with the finite-\mu measure but remains simple to simulate. We explore several...
QCD simulations at small chemical potential (2002)
De Forcrand, Ph., Kim, S., Takaishi, T.
Within the reweighting approach, one has the freedom to choose the Monte Carlo action so that it provides a good overlap with the finite-\mu measure but remains simple to simulate. We explore several...
Responses of quark condensates to the chemical potential (2002)
Miyamura, O., Choe, S., Liu, Y., Takaishi, T., Nakamura, A.
The responses of quark condensates to the chemical potential, as a function of temperature T and chemical potential \mu, are calculated within the Nambu--Jona-Lasinio (NJL) model. We compare our...
Screening mass responses to the chemical potential at finite temperature (2001)
De Forcrand, Ph., Pérez, M. García, Hioki, S., Liu, Y., Matsufuru, H., ...
Responses to chemical potential of the pseudoscalar meson screening mass and the chiral condensate in lattice QCD are investigated. On a $16 \times 8^2 \times \4$ lattice with two flavors of...
Quenched charmonium near the continuum limit (2001)
Choe, S, De Forcrand, Philippe, Pérez-Garcia, M, Hioki, S, Liu, Y, Matsufuru, H, ...
We study relativistic charmonium on very fine quenched lattices (beta=6.4 and 6.6). We concentrate on the calculation of the hyperfine splitting between eta_c and J/psi, aiming for a controlled...
Quenched charmonium near the continuum limit (2001)
De Forcrand, Ph., Perez, M. Garcia, Hioki, S., Liu, Y., Matsufuru, H., ...
We study relativistic charmonium on very fine quenched lattices (beta=6.4 and 6.6). We concentrate on the calculation of the hyperfine splitting between eta_c and J/psi, aiming for a controlled...
Odd-flavor Hybrid Monte Carlo Algorithm for Lattice QCD (2001)
Takaishi, T, De Forcrand, Philippe
We discuss hybrid Monte Carlo algorithms for odd-flavor lattice QCD simulations. The algorithms include a polynomial approximation which enables us to simulate odd-flavor QCD in the framework of the...
Responses of hadrons to the chemical potential at finite temperature (2001)
Choe, S, De Forcrand, Philippe, Pérez-Garcia, M, Hioki, S, Liu, Y, Matsufuru, H, ...
A formulation to obtain the response of hadron masses to the chemical potential is developed on the lattice. As a first trial, screening masses of pseudoscalar and vector mesons and their responses...
Responses of hadrons to chemical potential at finite temperature (2001)
De Forcrand, Ph., Pérez, M. García, Hioki, S., Liu, Y., Matsufuru, H., ...
We present a framework to compute the responses of hadron masses to the chemical potential in lattice QCD simulations. As a first trial, the screening mass of the pseudoscalar meson and its first and...
Chemical potential response of meson masses at finite temperature (2000)
Hashimoto, T., Hioki, S., Liu, Y., Matsufuru, H., Miyamura, O., ...
We study the response of meson masses to the chemical potential ($\partial{m}/\partial{\mu}$) at high temperature and at zero chemical potential on $N_f=2$ lattice with staggered fermions....
Simulation of n_f =3 QCD by Hybrid Monte Carlo (2000)
Takaishi, T., De Forcrand, Ph.
Simulations of odd flavors QCD can be performed in the framework of the hybrid Monte Carlo algorithm where the inverse of the fermion matrix is approximated by a polynomial. In this exploratory study...
Simulation of SU(2) Dynamical Fermion at Finite Chemical Potential and at Finite Temperature (2000)
Liu, Y., Miyamura, O., Nakamura, A., Takaishi, T.
SU(2) lattice gauge theory with dynamical fermion at non-zero chemical potential and at finite temperature is studied. We focus on the influence of chemical potential for quark condensate and mass of...
Meson Correlators in Finite Temperature Lattice QCD (2000)
De Forcrand, Philippe, García-Pérez, M, Hashimoto, T, Hioki, S, Matsufuru, H, Miyamura, O, ...
We analyze temporal and spatial meson correlators in quenched lattice QCD at T>0. Below T_c we observe little change in the meson properties as compared with T=0. Above T_c we observe new features:...
Meson Correlators in Finite Temperature Lattice QCD (2000)
Collaboration, QCD-TARO, De Forcrand, Ph., Perez, M. Garcia, Hashimoto, T., Hioki, S., Matsufuru, H., ...
We analyze temporal and spatial meson correlators in quenched lattice QCD at T>0. Below T_c we observe little change in the meson properties as compared with T=0. Above T_c we observe new features:...
Effects of Chemical Potential on Hadron Masses in the Phase Transition Region (1999)
Perez, M. Garcia, Hashimoto, T., Hioki, S., Liu, Y., Matsufuru, H., ...
We study the response of hadron masses with respect to chemical potential at $\mu=0$. Our preliminary results of the pion channel show that $\partial m/\partial \mu$ in the confinement phase is...
De Forcrand, Ph., Pérez, M. García, Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., ...
We investigate the renormalization group (RG) flow of SU(3) lattice gauge theory in a two coupling space with couplings $\beta_{11}$ and $\beta_{12}$ corresponding to $1\times 1$ and $1\times 2$...
A Study of Meson Correlators at Finite Temperature (1999)
Perez, M. Garcia, Hashimoto, T., Hioki, S., Katayama, R., Matsufuru, H., ...
We present results for mesonic propagators in temporal and spatial directions at T below and above the deconfining transition in quenched QCD. Anisotropic lattices are used to get enough information...
Monte Carlo Renormalization Group analysis of QCD in two dimensional coupling space (1999)
Perez, M. Garcia, Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., ...
We report our results of the Monte Carlo Renormalization Group analysis in two dimensional coupling space. The qualitative features of the RG flow are described with a phenomenological RG equation....
Mesons Above The Deconfining Transition (1999)
Perez, M. Garcia, Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., ...
We analyze temporal and spatial meson correlators in quenched lattice QCD at T>0. Above T_c we find different masses and (spatial) screening masses, signals of plasma formation, and indication of...
Effects of Chemical Potential on Hadron Masses at Finite Temperature (1998)
Perez, M. Garcia, Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., ...
We study the effects of the chemical potential on the $\rho$ meson mass at finite temperature. Our preliminary results show that some effects are seen in the vicinity of the phase transition point....
Finite Temperature QCD on Anisotropic Lattices (1998)
Perez, M. Garcia, Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., ...
We present results for mesonic propagators in temporal and spatial direction and for topological properties at T below and above the deconfining transition in quenched QCD. We use anisotropic...
Scaling Analysis of Improved Actions for Pure SU(3) Gauge Theory (1998)
De Forcrand, Philippe, García-Pérez, M, Hashimoto, T, Hioki, S, Matsufuru, H, Miyamura, O, ...
We have explored the behaviour of some improved actions based on a nonperturbative renormalization group (RG) analysis in coupling space. We calculate the RG flow in two-coupling space...
Scaling Analysis of Improved Actions for Pure SU(3) Gauge Theory (1998)
Peréz, M. Garc{\'\i}a, Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., ...
We have explored the behaviour of some improved actions based on a nonperturbative renormalization group (RG) analysis in coupling space. We calculate the RG flow in two-coupling space...
Thermodynamics of One-flavour QCD (1998)
Alexandrou, C., Boriçi, A., Feo, A., De Forcrand, Ph., Galli, A., Jegerlehner, F., ...
We give a brief introduction on finite temperature phase transitions in lattice QCD including a discussion on the identification of first order transitions. We present a study of the deconfinement...
Truncation Effects in Monte Carlo Renormalization Group Improved Lattice Actions (1998)
Takaishi, T., De Forcrand, Ph.
We study truncation effects in the SU(3) gauge actions obtained by the Monte Carlo renormalization group method. By measuring the heavy quark potential we find that the truncation effects in the...
One-flavour QCD at finite temperature (1997)
Alexandrou, C., Borici, A., Feo, A., De Forcrand, Ph., Galli, A., Jegerlehner, F., ...
We present results, for heavy to moderate quark masses, of a study of thermodynamic properties of 1-flavour QCD, using the multiboson algorithm. Finite-size scaling behaviour is studied on lattices...
Three topics in the Schwinger model (1997)
De Forcrand, Ph., Hetrick, J. E., Takaishi, T., Van Der Sijs, A. J.
1. We compare Monte Carlo results with analytic predictions for the fermion condensate, in the massive one-flavour Schwinger model. 2. We illustrate on the Schwinger model how to facilitate...
Thermodynamics of 1-flavor QCD (1996)
Alexandrou, C., Boriçi, A., Feo, A., De Forcrand, Ph., Galli, A., Jegerlehner, F., ...
We present first results, for heavy to moderate quark masses, of a study of thermodynamic properties of 1-flavor QCD, using the multiboson algorithm.
Finite Temperature Gauge Theory on Anisotropic Lattices (1996)
Fujisaki, M., Okuda, M., Tago, Y., Hashimoto, T., Hioki, S., Matsufuru, H., ...
The finite temperature transition of QCD can be seen as a change in the structure of the hadrons and as a symmetry breaking transition -- a change in the structure of the vacuum. These phenomena are...
Search for Effective Lattice Action of Pure QCD (1996)
DeForcrand, Ph., Fujisaki, M., Hashimoto, T., Hioki, S., Matsufuru, H., Miyamura, O., ...
We study a coupling flow of pure QCD gauge system by using the Monte Carlo Renormalization Group method. A rough location of the renormalized trajectory in two coupling space is obtained. Also we...
Systematic study of autocorrelation time in pure SU(3) lattice gauge theory (1993)
Akemi, K., DeForcrand, Ph., Fujisaki, M., Hashimoto, T., Hioki, S., Miyamura, O., ...
Results of our autocorrelation measurement performed on Fujitsu AP1000 are reported. We analyze (i) typical autocorrelation time, (ii) optimal mixing ratio between overrelaxation and pseudo-heatbath...
Scaling Study of Pure Gauge Lattice QCD by Monte Carlo Renormalization Group Method (1993)
Akemi, K., DeForcrand, Ph., Fujisaki, M., Hashimoto, T., Hege, H. C., Hioki, S., ...
The scaling behavior of pure gauge SU(3) in the region $\beta=5.85 - 7.60$ is examined by a Monte Carlo Renormalization Group analysis. The coupling shifts induced by factor 2 blocking are measured...
Akemi, K., DeForcrand, Ph., Fujisaki, M., Hashimoto, T., Hege, H. C., Hioki, S., ...
We measure the sweep-to-sweep autocorrelations of blocked loops below and above the deconfinement transition for SU(3) on a $16^4$ lattice using 20000-140000 Monte-Carlo updating sweeps. A divergence...
Matsui, T, Sano, K, Tsukamoto, T, Ito, M, Takaishi, T, Nakata, H, ...
Both platelet-derived growth factor (PDGF) A- and B-chains are expressed in mammalian neurons, but their precise roles still remain to be clarified. In the present studies, we examined the expression...
Matsui, T, Sano, K, Tsukamoto, T, Ito, M, Takaishi, T, Nakata, H, ...
Both platelet-derived growth factor (PDGF) A- and B-chains are expressed in mammalian neurons, but their precise roles still remain to be clarified. In the present studies, we examined the expression...
頸動脈毬剔出後に於ける腦・脊髓・並に毬附近神經系の組織學的研究 : 特に自律神經系に關する研究
鈴木, 次郞, 高石, 壽, Suzuki, J., Takaishi, T.
It has been known that the carotid body is autonomic recepter. We observed the degenerations in the peripheral nerves, cervical cord and the brain following extirpation of the carotid body and...