213 research outputs found
Gauge topology and confinement: an update
In the instanton ensemble the fermionic zero modes collectivize and break
chiral symmetry. Recent studies of resulting zero mode zone confirm its very
small width and overall importance for lattice simulations.
Confinement however has been related with completely different topological
objects, the magnetic monopoles. Instanton constituents -- instanton dyons,
discovered at nonzero holonomy by Pierre van Baal and others -- are able to
explain both confinement and chiral symmetry breaking. The talk summarizes
recent works deriving the instanton-dyon mutual interactions, and statistical
studies of their ensemble. At high density the screening is robust enough to do
it analytically, in the mean-field-type approach: we call this limit Dense
Dyonic Plasma (DDP). Above the classical interaction between the dyons
induce strong correlations and should be studied by direct numerical
simulations. Those works are now in progress.Comment: This is a writeup for proceedings of the 9th International Workshop
on Critical Point and Onset of Deconfinement - CPOD2014. A talk of similar
structure and content has also been given at The 32nd International Symposium
on Lattice Field Theory, Columbia University, New York, June 201
Emerging Theory of Strongly Coupled Quark-Gluon Plasma
RHIC data have shown robust collective flows, including recent spectacular
``conical flow'' from quenched jets: that confirms that QGP above the critical
line is in a strongly coupled regime. One way to study Non-Abelian classical
strongly coupled plasmas is via molecular dynamics, which was recently extended
to plasmas with electric and magntic charges. First results on its transport
(diffusion and viscosity) are reported.
AdS/CFT correspondence is another actively pursuit approach to strong
coupling regime: we review new results for heavy quark motion and even complete
picture of conical flow, obtained from linearized gravity dual. Recent
developments in (non-linearized) gravity aims at reproduction of the whole
time-dependent picture of the explosion. We finally compare transport
properties obtained from RHIC data to those obtained in MD and AdS/CFT.Comment: Written contribution: a talk at Yukawa Institute meeting (YUKIS)
November 200
Deconfinement, Monopoles and New Phenomena in Heavy Ion Collisions
We discuss various manifestations of the "magnetic scenario" for the
quark-gluon plasma viewed as a mixture of two plasmas, of electrically (quark
and gluons) as well as magnetically charged quasiparticles. Near the
deconfinement phase transition, very small density of free
quarks should lead to negligible screening of electric field while magnetic
screening remains strong. The consequence of this should be existence of a
"corona" of the QGP, in a way similar to that of the Sun, in which electric
fields influence propagation of perturbations and even form metastable flux
tubes. The natural tool for its description is (dual) magnetohydrodynamics:
among observable consequences is splitting of sound into two modes, with larger
and smaller velocity. The latter can be zero, hinting for formation of
pressure-stabilized flux tubes. Remarkably, recent experimental discoveries at
RHIC show effects similar to expected for "corona structures". In dihadron
correlation function with large- trigger there are a "cone" and a "hard
ridge",while the so called "soft ridge" is a similar structure seen without
hard trigger. They seem to be remnants of flux tubes, which -- contrary to
naive expectations -- seem to break less often in near- matter than do
confining strings in vacuum.Comment: Written version of talk given at "Shifmania" conference, June 2009,
Minneapolis, related to 60-the birthday of Misha Shifma
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