Conveners
Vacuum Structure and Confinement: Parallel 3F
- Jeff Greensite (San Francisco State University)
Vacuum Structure and Confinement: Parallel 4F
- Edward Shuryak (Stony Brook)
Vacuum Structure and Confinement: Parallel 5F
- Harry Thacker (University of Virginia)
Vacuum Structure and Confinement: Parallel 6F
- Eduardo Follana Adin (Universidad de Zaragoza)
Vacuum Structure and Confinement: Parallel 7F
- Michael Ogilvie (Washington University)
Dr
Nigel Cundy
(Seoul National University)
24/06/2014, 14:15
Vacuum Structure and Confinement
Talk
In the past few years, we have presented a new way of considering quark confinement. Through a careful choice of a Cho-Duan-Ge Abelian Decomposition, we can construct the QCD Wilson Loop in terms of an Abelian restricted field. The relationship between the QCD and restricted string tensions is exact; and we do not need to gauge fix, apply any path ordering of gauge links, or additional path...
Prof.
Ivan Horvath
(University of Kentucky)
24/06/2014, 14:35
Vacuum Structure and Confinement
Talk
We examine the feasibility of the proposition that in Nf=0 QCD there is a temperature range (T_c < T < T_ch) where real Polyakov line (deconfined) vacuum exhibits valence spontaneous chiral symetry breaking and dynamical chiral polarization of Dirac eigenmodes.
Prof.
Edward Shuryak
(Stony Brook)
24/06/2014, 14:55
Vacuum Structure and Confinement
Talk
QCD topology -- mostly instantons -- had been used in the past to explain near-zero Dirac states and chiral symmetry breaking. At $T \sim T_c$ instanton are known to get
decomposed into $N_c$ instanton-dyons. Several lattice observation were naturally
explained by instanton-dyons.
Their partition function is now numerically generated: the statistical ensemble is then used to get spectrum of...
Dr
Takumi Iritani
(High Energy Accelerator Research Organization (KEK))
24/06/2014, 15:35
Vacuum Structure and Confinement
Talk
The presence of color source may modify the chiral condensate that characterizes the spontaneous breaking of chiral symmetry in the QCD vacuum. Using the overlap-Dirac eigenmodes, we investigate this phenomenon around static color sources representing quark-antiquark and three-quark systems. We show that the chiral condensate is reduced inside the flux-tube that is formed between the color...
Prof.
Michael Ogilvie
(Washington University)
24/06/2014, 16:30
Vacuum Structure and Confinement
Talk
Recent results applying resurgence theory to finite-temperature field theories yield a detailed analytic structure determined by topological excitations. We examine finite-temperature SU(N) lattice gauge theories in light of these results. Double-trace Polyakov loop deformations move through different regions of the confined phase characterized by continuous change in the adjoint Polyakov...
Dr
Akihiro Shibata
(KEK)
24/06/2014, 16:50
Vacuum Structure and Confinement
Talk
We have proposed the non-Abelian dual super conductivity in SU(3) Yang-Mills (YM) theory for the mechanism of quark confinement, and by using the proposed gauge link decomposition to extract magnetic monopole in the gauge invariant way we presented the evidences in lattice conferences.
In this talk, we focus on the dual Meissner effects in view of the magnetic monopole in SU(3)...
Dr
Masayasu Hasegawa
(Bogoliubov Laboratory of Theoretical Physics, JINR)
24/06/2014, 17:10
Vacuum Structure and Confinement
Talk
Monopoles are considered that play the very important roles for the color confinement mechanism. University of Kanazawa and Pisa groups have shown a number of studies which support the confinement mechanism due to monopole condensations by the lattice simulations.
Instantons that are other topological objects found as solutions of QCD. The close relations to chiral symmetry breaking are...
Dr
Eduardo Follana Adin
(Universidad de Zaragoza)
24/06/2014, 17:30
Vacuum Structure and Confinement
Talk
We investigate numerically the spectral flow introduced by Adams for the staggered Dirac operator on realistic quenched gauge configurations in 2D and 4D. We study both the unimproved and the HISQ Dirac operators, and we compare with the case of spectral flow for Wilson fermions. We show that the spectral flow provides a good topological definition of the index, with a clear separation of high...
Prof.
Thacker H. B.
(University of Virginia)
24/06/2014, 17:50
Vacuum Structure and Confinement
Talk
There is considerable evidence, based on large $N_c$ chiral dynamics, holographic QCD,
and Monte Carlo studies, that the topological structure of the QCD vacuum consists of
discrete quasivacua separated by domain walls across which the local value of
the topological $\theta$ parameter jumps by $\pm2\pi$.
Topological insulators are condensed matter systems which are bulk insulators with...
Dr
michele caselle
(Department of Physics, Torino University)
25/06/2014, 09:00
Vacuum Structure and Confinement
Talk
One of the most interesting recent results on the effective string description of Lattice Gauge Theories is the universality of the first few terms of the effective action. This is a direct consequence of the Lorentz invariance of the underlying LGTs and makes this theory much more predictive than usual effective models in particle physics.
Besides the well known Nambu-Goto action, one of...
Mr
Davide Vadacchino
(Università degli Studi di Torino - INFN Sezione di Torino)
25/06/2014, 09:20
Vacuum Structure and Confinement
Talk
The U(1) lattice gauge theory in three dimensions is a perfect laboratory to study the subtle properties of the confining string. On the one hand, thanks to the mapping to a coulomb gas of monopoles, the model can be exactly solved and confinement proven analytically. On the other hand high-precision numerical estimates of Polyakov loop correlators can be obtained via a duality map to a spin...
Francesca Cuteri
(Università della Calabria, INFN-Cosenza)
25/06/2014, 09:40
Vacuum Structure and Confinement
Talk
The transverse profile of the chromoelectric field generated by a quark-antiquark pair in the SU(3) vacuum is analysed within the dual superconductor scenario, then the London penetration depth and coherence length are extracted.
The color field is determined on the lattice through a connected correlator of two Polyakov loops measured on smeared configurations.
Mr
Francesco Negro
(INFN - Sezione di Pisa)
25/06/2014, 10:00
Vacuum Structure and Confinement
Talk
We determine the static quark anti-quark potential for QCD at the
physical point in the presence of an external magnetic field.
The potential is anisotropic, in particular it is steeper in the
directions orthogonal to the magnetic field than in the parallel one.
The string tension increases (decreases) in the orthogonal
(parallel) directions; the absolute value of the Coulomb...
Dr
Yoshiaki Koma
(Numazu College of Technology)
25/06/2014, 10:20
Vacuum Structure and Confinement
Talk
We study the static three-quark potential in SU(3) lattice gauge theory at zero temperature with the Polyakov loop correlation function (PLCF) consisting of three Polyakov loops.
Compared to the use of the three-quark Wilson loop, the PLCF allows us to investigate
the ground state potential of various three-quark configurations in detail with less systematic effects.
We overcome the problem...
Marco Cè
(Scuola Normale Superiore, Pisa, Italy and INFN, Sezione di Pisa, Italy)
25/06/2014, 11:10
Vacuum Structure and Confinement
Talk
We present a precise computation of the topological charge distribution in the SU(3) Yang–Mills theory. It is carried out on the lattice with high statistics Monte Carlo simulations by employing the clover discretization of the field strength tensor combined with the Yang–Mills gradient flow. The flow equations are integrated numerically by a fourth-order structure-preserving Runge–Kutta...
Dr
Andre Sternbeck
(University of Regensburg)
25/06/2014, 11:30
Vacuum Structure and Confinement
Talk
We investigate the exact gluonic Dyson-Schwinger equation of quenched SU(n) lattice gauge theory in Landau gauge and the lattice analog of the
Kugo-Ojima confinement criterion.
Dr
Paulo Silva
(University of Coimbra)
25/06/2014, 11:50
Vacuum Structure and Confinement
Talk
The Z(N) dependence of the pure Yang-Mills gluon propagator, in the Landau gauge, is investigated at finite temperature for N=3. Special attention will be given to the behaviour near the critical temperature Tc. Our simulations show a complex pattern as expected in a first order phase transition. Furthermore, we identify an order parameter directly associated with the breaking of the SU(3)...
Mr
Roman Hoellwieser
(NMSU)
25/06/2014, 12:10
Vacuum Structure and Confinement
Talk
We present a method to smear (center projected) Z(2) vortices in order to obtain properties of the original (full) SU(2) configurations. In particular we address the problem that Z(2) configurations cannot be treated with overlap (or chirally improved) fermions due to their lack of smoothness. We develop a method to regain this smoothness and simultaneously maintain the center vortex...
Mr
Daniel Trewartha
(University of Adelaide)
25/06/2014, 12:30
Vacuum Structure and Confinement
Talk
The fundamental aspects of the QCD vacuum that are responsible for the dynamical generation of mass through chiral symmetry breaking is an ongoing source of debate. We investigate the role of centre vortices in dynamical mass generation using overlap fermions. The exact chiral symmetry that the overlap fermion action possesses yields a distinctive response to the underlying topology of the...
Prof.
Leonid Glozman Glozman
(University of Graz)
26/06/2014, 14:15
Vacuum Structure and Confinement
Talk
Using the overlap Dirac operator we remove its
lowest-lying eigenmodes from the valence quark
propagators and study evolution of the J=1 meson
masses. At the truncation energy about 50 MeV we
observe a degeneracy of all possible U(2)_L * U(2)_R
multiplets, i.e. the observed quantum levels have
a symmetry larger than U(2)_L * U(2)_R and their
energy does not depend on the spin...
Mr
Victor Braguta
(IHEP)
26/06/2014, 14:35
Vacuum Structure and Confinement
Talk
The axial magnetic field, which couples to left- and right-handed fermions with opposite signs, may generate an equilibrium dissipationless energy flow of fermions in the direction of the field even in the presence of interactions. In this report numerical observation of the Axial Magnetic Effect in SU(2) lattice gauge theory is presented. The temperature behavior of the Axial Magnetic Effect...
Dr
Alexander Molochkov
(Far Eastern Federal University)
26/06/2014, 14:55
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 operatros 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....
Prof.
Jacek Wosiek
(Jagellonian University)
26/06/2014, 15:15
Vacuum Structure and Confinement
Talk
Screening of external charges by electric fluxes induced by periodic
boundary conditions in two dimensional gauge theories will be discussed.
Subsequently, the less known problem of introducing sources with arbitrary
charge, i.e. non-congruent with an elementary one, will be presented and
elaborated. Finally the new, classical continuum limit of lattice
formulation will be proposed and...
Mr
Shinya Gongyo
(Kyoto University)
26/06/2014, 15:35
Vacuum Structure and Confinement
Talk
We study numerically the phase structure in two dimensions
with SU(2) gauge-Higgs coupling.
We calculate the static potential from Wilson Loop, W propagator
and the order parameter related to a transition between the confinement-like
phase and Higgs-like phase. Our results suggest that there
is a confinement-like phase and Higgs-like phase, even in two dimensions.
In the confinement-like...
Mithat Unsal
(North Carolina State University)
26/06/2014, 15:55
Vacuum Structure and Confinement
Talk
This talk presents a summary of our current understanding of confinement problem in non-abelian gauge theories. It is dedicated to the memory of Pierre van Baal, who contributed to the field significantly.
I will review recent semi-classically calculable realization of confinement in various gauge theories. In particular, I will describe the role of monopole-instantons(realized by van...
