Suzuki, T., Hasegawa, M., Ishiguro, K., Koma, Y., Sekido, T.
The mechanism of non-Abelian color confinement is studied in SU(2) lattice gauge theory in terms of the Abelian fields and monopoles extracted from non-Abelian link variables without adopting gauge...
Weinberg, V., Koller, K., Koma, Y., Nakamura, Y., Schierholz, G., ...
Overlap fermions are particularly well suited to study the finite temperature dynamics of the chiral symmetry restoration transition of QCD, which might be just an analytic crossover. Using gauge...
Localization of overlap modes and topological charge, vortices and monopoles in SU(3) LGT (2007)
Koller, K., Koma, Y., Schierholz, G., Streuer, T., Weinberg, V., ...
We present selected recent results of the QCDSF collaboration on the localization and dimensionality of low overlap eigenmodes and of the topological density in the quenched SU(3) vacuum. We discuss...
Exploring the structure of the quenched QCD vacuum with overlap fermions (2007)
Koller, K., Koma, Y., Schierholz, G., Streuer, T., Weinberg, V.
Overlap fermions have an exact chiral symmetry on the lattice and are thus an appropriate tool for investigating the chiral and topological structure of the QCD vacuum. We study various chiral and...
Vacuum structure as seen by overlap fermions (2006)
Koller, K., Koma, Y., Schierholz, G., Streuer, T., Weinberg, V.
Three complementary views on the QCD vacuum structure, all based on eigenmodes of the overlap operator, are reported in their interrelation: (i) spectral density, localization and chiral properties...
The QCD vacuum probed by overlap fermions (2006)
Weinberg, V., Koller, K., Koma, Y., Schierholz, G., Streuer, T.
We summarize different uses of the eigenmodes of the Neuberger overlap operator for the analysis of the QCD vacuum, here applied to quenched configurations simulated by means of the Luescher-Weisz...
Nonperturbative Determination of the QCD Potential at O(1/m). (2006)
Y. Koma, DESY Forschung Hochenergiephysik, M. Koma, H. Wittig
Journal article
Spin-dependent Potentials from Lattice QCD. (2006)
Y. Koma, DESY Forschung Hochenergiephysik, M. Koma
Internal report | Preprint
The QCD vacuum probed by overlap fermions. 2006-07-23 - 2006-07-28 (2006)
V. Weinberg, E.M. Ilgenfritz, K. Koller, Y. Koma, ...
Contribution to a conf. proceeding (book/online)
The QCD vacuum probed by overlap fermions. 2006-07-23 - 2006-07-28 (2006)
V. Weinberg, E.M. Ilgenfritz, K. Koller, Y. Koma, ...
Contribution to a conf. proceeding (book/online)
Probing the topological structure of the QCD vacuum with overlap fermions (2005)
Koller, K., Koma, Y., Schierholz, G., Streuer, T., Weinberg, V.
Overlap fermions implement exact chiral symmetry on the lattice and are thus an appropriate tool for investigating the chiral and topological structure of the QCD vacuum. We study various chiral and...
Probing the chiral phase transition of N_f=2 clover fermions with valence overlap fermions (2005)
Weinberg, V., Koller, K., Koma, Y., Schierholz, G., Streuer, T.
Overlap fermions are a powerful tool for investigating the chiral and topological structure of the vacuum and the thermal states of QCD. We study various chiral and topological aspects of the finite...
Koma, Y., Koller, K., Schierholz, G., Streuer, T., Weinberg, V.
Overlap fermions, which preserve exact chiral symmetry on the lattice, provide a powerful tool for investigating the topological structure of the vacuum. Applying this formulation to zero-temperature...
Construction of the Dual Ginzburg-Landau Theory from the Lattice QCD (2004)
Suganuma, H., Amemiya, K., Ichie, H., Koma, Y.
We briefly review the QCD physics and then introduce recent topics on the confinement physics. In the maximally abelian (MA) gauge, the low-energy QCD is abelianized owing to the effective...
Bornyakov, V. G., Chernodub, M. N., Ichie, H., Koma, Y., Mori, Y., Polikarpov, M. I., ...
We study the Abelian flux tube profile of mesonic and the baryonic configurations of static quarks below and above the finite-temperature transition in $N_f=2$ full QCD. To reduce effects of...
Finite Temperature QCD with Two Flavors of Non-perturbatively Improved Wilson Fermions (2004)
Bornyakov, V. G., Chernodub, M. N., Ichie, H., Koma, Y., Mori, Y., Nakamura, Y., ...
We study QCD with two flavors of non-perturbatively improved Wilson fermions at finite temperature on the $16^3 8$ lattice. We determine the transition temperature at lattice spacings as small as $a...
Glueball masses in U(1) LGT using the multi-level algorithm (2004)
Majumdar, P., Koma, Y., Koma, M.
The multi-level algorithm allows, at least for pure gauge theories, reliable measurement of exponentially small expectation values. The implementation of the algorithm depends strongly on the...
Dynamics of Monopoles and Flux Tubes in Two-Flavor Dynamical QCD (2003)
Bornyakov, V. G., Ichie, H., Koma, Y., Mori, Y., Nakamura, Y., Pleiter, D., ...
We investigate the confining properties of the QCD vacuum with $N_f=2$ flavors of dynamical quarks, and compare the results with the properties of the quenched theory. We use non-perturbatively...
Structure of the baryonic flux tube in N_{f}=2 lattice QCD at finite temperature (2003)
Mori, Y., Bornyakov, V., Ichie, H., Koma, Y., Polikarpov, M., Schierholz, G., ...
We study the flux tube profile in the baryonic system in full QCD at finite temperature on $N_{t}=8$ lattice. We fix the maximally Abelian gauge and measure the monopole and the photon parts of the...
Nakamura, Y., Bornyakov, V., Chernodub, M. N., Koma, Y., Mori, Y., Polikarpov, M. I., ...
We present results for QCD with $N_f=2$ flavors of dynamical quarks using nonperturbatively improved Wilson fermions at finite temperature on $16^3 \times 8$ and $24^3 \times 10$ lattices. We...
Koma, Y., Koma, M., Majumdar, P.
The 4D compact U(1) lattice gauge theory (LGT) in the confinement phase is studied with the multi-level algorithm. The static potential, force and flux-tube profile between two static charges are...
Glueball masses in U(1) LGT using the multi-level algorithm (2003)
Majumdar, P., Koma, Y., Koma, M.
The multi-level algorithm allows, at least for pure gauge theories, reliable measurement of exponentially small expectation values. The implementation of the algorithm depends strongly on the...
Koma, Y., Koma, M., Suzuki, T.
The color-electric flux tube of Abelian-projected (AP) SU(2) lattice gauge theory in the maximally Abelian gauge (MAG) is revisited. It is shown that the lattice Gribov copy effect in the MAG is...
Koma, Y., Koma, M., Suzuki, T., Polikarpov, M. I.
The structure of the flux-tube profile in Abelian-projected (AP) SU(2) gauge theory in the maximally Abelian gauge is studied. The connection between the AP flux tube and the classical flux-tube...
Mori, Y., Bornyakov, V., Chernodub, M., Koma, Y., Nakamura, Y., Polikarpov, M., ...
The finite temperature lattice QCD with N_f=2 nonperturbatively improved Wilson fermions is studied on 16^3 8 lattice. Using abelian projection after fixing to MA gauge we determine the transition...
Heavy quark potential in lattice QCD at finite temperature (2003)
Bornyakov, V., Chernodub, M., Koma, Y., Mori, Y., Nakamura, Y., Polikarpov, M., ...
Results of the study of lattice QCD with two flavors of nonperturbatively improved Wilson fermions at finite temperature are presented. The transition temperature for m_{\pi}/m_{\rho} \sim 0.8 and...
The color-electric flux tube of Abelian-projected (AP) SU(2) lattice gauge theory in the maximally Abelian gauge (MAG) is revisited. It is shown that the lattice Gribov copy effect in the MAG is...
Koma,Y., Koma,M., Suzuki,T., Polikarpov,M. I.
The structure of the flux-tube profile in Abelian-projected (AP) SU(2) gauge theory in the maximally Abelian gauge is studied. The connection between the AP flux tube and the classical flux-tube...
Koma, Y., Koma, M., Suzuki, T.
The color-electric flux tube of Abelian-projected (AP) SU(2) lattice gauge theory in the maximally Abelian gauge (MAG) is revisited. It is shown that the lattice Gribov copy effect in the MAG is...
Koma, Y., Koma, M., Suzuki, T., Polikarpov, M. I.
The structure of the flux-tube profile in Abelian-projected (AP) SU(2) gauge theory in the maximally Abelian gauge is studied. The connection between the AP flux tube and the classical flux-tube...
The profile of the broken string in the confined and deconfined phase in full QCD (2002)
Bornyakov, V., Ichie, H., Koma, Y., Mori, Y., Nakamura, Y., Polikarpov, M., ...
We study the profile of the broken string (flux tube) in the maximally abelian gauge below and above the finite temperature phase transition in full QCD. In the deconfinement phase, the flux tube...
A fresh look on the flux tube in Abelian-projected SU(2) gluodynamics (2002)
Koma, Y., Koma, M., Suzuki, T., Polikarpov, M. I.
We reconsider the properties of the $Q\bar{Q}$ flux tube within Abelian-projected SU(2) lattice gauge theory in terms of electric field and monopole current. In the maximal Abelian gauge we assess...
Thermodynamics and heavy quark potential in N_f=2 dynamical QCD (2002)
Bornyakov, V., Nakamura, Y., Chernodub, M., Koma, Y., Mori, Y., Polikarpov, M., ...
We study N_f=2 lattice QCD with nonperturbatively improved Wilson fermions at finite temperature on 16^3 \cdot 8 lattices. We determine the transition temperature at m_{\pi}/m_{\rho} \sim 0.8 and...
On the dynamics of color magnetic monopoles in full QCD (2001)
Bornyakov, V., Ichie, H., Kitahara, S., Koma, Y., Mori, Y., Nakamura, Y., ...
We present first results on the dynamics of monopoles in full QCD with N_f=2 flavors of dynamical quarks. Among the quantities being studied are the monopole density and the monopole screening...
Topics of monopole dynamics in gluodynamics (2001)
Suzuki, T., Koma, Y., Ito, S., Park, T. W., Polikarpov, M. I., ...
Three topics of monopole dynamics in gluodynamics are presented. 1)Gauge (in)dependence of the monopole effective action (S.Ito, T.W.Park, T.Suzuki): Four different abelian projections are studied....
Casimir scaling in a dual superconducting scenario of confinement (2001)
Koma, Y., Toki, H., Suzuki, T.
The string tensions of flux tubes associated with static charges in various SU(3) representations are studied within the dual Ginzburg-Landau (DGL) theory. The ratios of the string tensions between...
Weyl symmetric representation of hadronic flux tubes in the dual Ginzburg-Landau theory (2000)
Koma, Y., Suzuki, T., Toki, H.
Hadronic flux-tube solutions describing the mesonic and the baryonic states within the dual Ginzburg-Landau (DGL) theory are investigated by using the dual lattice formulation in the Weyl-symmetric...
Quark Confinement Physics in Quantum Chromodynamics (1999)
Koma, Y., Suganuma, H., Amemiya, K., Fukushima, M., Toki, H.
We study abelian dominance and monopole condensation for the quark confinement physics using the lattice QCD simulations in the MA gauge. These phenomena are closely related to the dual...
Instantons and Monopoles for Nonperturbative QCD (1998)
Suganuma, H., Araki, F., Fukushima, M., Ichie, H., Koma, Y., Sasaki, S., ...
We study the nonperturbative QCD in terms of topological objects, i.e., QCD-monopoles and instantons. In the 't Hooft abelian gauge, QCD is reduced into an abelian gauge theory with QCD-monopoles,...
The long range properties of the compact U(1) lattice gauge theory with the multi-level algorithm
The 4D compact U(1) lattice gauge theory (LGT) in the confinement phase is studied with the multi-level algorithm. The static potential, force and flux-tube profile between two static charges are...
The long range properties of the compact U(1) lattice gauge theory with the multi-level algorithm
Koma, Y., Koma, M., Majumdar, P.
The 4D compact U(1) lattice gauge theory (LGT) in the confinement phase is studied with the multi-level algorithm. The static potential, force and flux-tube profile between two static charges are...
Vacuum structure as seen by overlap fermions. 2006-09-02 - 2006-09-07
K. Koller, Y. Koma, G. Schierholz, ...
Conference presentation