Conveners
Vacuum Structure and Confinement
- Akihiro Shibata
Vacuum Structure and Confinement
- Miho Koma
Dr
Masayasu Hasegawa
(Joint Institute for Nuclear Research)
17/07/2015, 14:00
Vacuum Structure and Confinement
Talk
The purpose of this study is to show that monopoles are related to chiral symmetry breaking and to instantons, using the Overlap fermions as an analytical tool.
In order to study these relations, we add one pair of monopoles with different magnetic charges to the quenched SU(3) configurations by a monopole creation operator. We then count the number of zero modes, and compute the average...
Ivan Horvath
(University of Kentucky)
17/07/2015, 14:20
Vacuum Structure and Confinement
Talk
We describe our recent proposal that distinct phases of vector-like gauge
theories with fundamental quarks translate into specific types of
low-energy behavior in Dirac spectral density. The resulting scenario
is built around new evidence substantiating the existence of a phase
characterized by bimodal (anomalous) density, and corresponding
to deconfined dynamics with broken valence...
Mr
Takahiro Doi
(Kyoto University)
17/07/2015, 14:40
Vacuum Structure and Confinement
Talk
We investigate contribution to the Polyakov loop fluctuations from each Dirac mode. The Polyakov loop fluctuations are sensitive probes for the quark deconfinement even if considering dynamical quarks. We derive analytical relations between the Polyakov loop fluctuations and Dirac modes on the temporally odd-number lattice, where the temporal lattice size is odd, with the normal non-twisted...
Prof.
Leonid Glozman
(University of Graz)
17/07/2015, 15:00
Vacuum Structure and Confinement
Talk
A large degeneracy of mesons of given spin has been discovered upon reduction of the quasi-zero modes of the Dirac operator in a dynamical
simulation. One expects a priori, that upon elimination of the quasi-zero modes of the Dirac operator, the chiral symmetry should be restored, since the quark condensate of the vacuum is connected with the density of the quasi-zero modes. However, it has...
Pedro Bicudo
(IST, Univ. Lisboa)
17/07/2015, 15:20
Vacuum Structure and Confinement
Talk
Covariant $R_\xi$ gauge fixing is notoriously difficult for large lattice volumes, large $\xi$ and small $N_c$. We thoroughly test different convergence techniques, which allows the gauge fixing of lattice configurations with a total volume of (3.25 fm)$^4$, up to $\xi=0.5$. We are able to study the gluon propagator in the infrared region and its dependence on the gauge fixing parameter...
Marco Cè
(Scuola Normale Superiore, Pisa & INFN, Sezione di Pisa)
17/07/2015, 15:40
Vacuum Structure and Confinement
Talk
We report the results of a study of the distribution of the topological charge of the SU(3) Yang–Mills theory: we estimate the second and fourth cumulant with high precision in order to measure the deviation from the normal distribution. The computation is done on the lattice implementing a naïve discretization of the topological charge evolved with the Yang–Mills gradient flow. A range of...
Prof.
Alexander Molochkov
(School of Biomedicine, Far Eastern Federal University)
17/07/2015, 16:30
Vacuum Structure and Confinement
Talk
The most important probes for the phase states of a four-dimensional gauge field theory are the Wilson and t’Hooft line operators that are defined on one-dimensional curves in the space-time. However, for more detail understanding of four-dimensional gauge field theory dynamics and vacuum topology we need additional probes expressed by operators defined on the subspaces with higher dimensions....
Akihiro Shibata
(Computing Research Center, KEK)
17/07/2015, 16:50
Vacuum Structure and Confinement
Talk
We have pointed out that the SU(3) Yang-Mills theory has a new way of reformulation
using new field variables (minimal option), in addition to the conventional option
adopted by Cho, Faddeev and Niemi (maximal option).
The reformulation enables us to change the original non-Abelian gauge field into
the new field variables such that one of them called the restricted field gives
the...
Dr
Vitaly Bornyakov
(FEFU, Vladivostok)
17/07/2015, 17:10
Vacuum Structure and Confinement
Talk
We study Landau gauge transverse and longitudinal gluon propagators at non-zero
temperature in close vicinity of the phase transition in SU(2) gluodynamics.
We compute the screening mass and the electric-magnetic asymmetry of the
A**2 condensate. Our goal is to provide results free of finite volume and
Gribov copies systematic effects and with small scaling violations.
Francesca Cuteri
(University of Calabria)
17/07/2015, 17:30
Vacuum Structure and Confinement
Talk
An attempt to adapt the study of color flux tubes to the case of finite temperature has been made.
The field is measured through a connected correlator of Wilson loop and plaquette in the spatial sub-lattice. Still the profile of the flux tube resembles the transverse field distribution around an isolated vortex in an ordinary superconductor.
The temperature dependence of all the parameters...
Prof.
Hideo Suganuma
(Kyoto University)
17/07/2015, 17:50
Vacuum Structure and Confinement
Talk
We study the static three-quark (3Q) potential with high statistics in SU(3) lattice QCD at the quenched level. For all the distances, the 3Q potential is found to be well described by the Y-Ansatz, i.e., one-gluon-exchange Coulomb plus Y-type linear potential.
As a remarkable fact, we find that the quark confinement force in the 3Q system can be perfectly described only with Abelian...
