| Name |
Talk |
| Aarts, Gert |
Nonequilibrium fields: quantum transport equations with memory:
Derivations of transport or kinetic equations often assume a
quasi-particle (on-shell) approximation. This assumption is investigated
using $2PI$ effective action methods, resulting in a truncation of the
Schwinger-Dyson hierarchy that includes both the Hartree part and the
resummed nonlocal scattering contribution. For a scalar field in $1+1$
dimensions the nonlinear evolution, including the integration over memory
kernels, can be solved numerically without any further approximation.
Results are presented for both early and late times. |
| Barresi, Andrea |
No |
| Berges, Juergen |
Controlled nonperturbative dynamics of quantum fields out of
equilibrium: The conventional 1/N expansion for the 1PI effective action
has been successfully applied in the past to computations of
the equilibrium effective potential. However, it fails to give
a controlled expansion for the nonequilibrium time evolution
of fields. In contrast, we show that the 1/N expansion for the
2PI effective action yields a truly small expansion parameter.
For the first time this allows for a controlled nonperturbative
approach to a quantum field theory out of equilibrium. We present
numerical results for the 1+1 dimensional O(N) model. |
| Burgio, Giuseppe |
Z2 vs. SO(3): from which could "thick" vortices arise?:
We study the decomposition of an SU(2) LGT into its center and
coset spaces, where the latter might give rise to topological
degrees of freedom through its first homotopy group. Different
possible definitions are exploited, as well as which is the fate
of the various contributions as the continuum limit is
approached. |
| Davies, Andrew |
No |
| Di Giacomo, Adriano |
Mechanism of color confinement: monopoles and vortices:
A few new results will be presented on monopole
condensation. A critical discussion of the results and of
the open problems will follow. |
| Engels, Juergen |
Goldstone-mode effects and scaling functions for the 3d O(4) and
O(2) models:
We investigate the three-dimensional O(4) and O(2) models numerically
on lattices of size up to 120^3 as a function of the magnetic
field H. The H-dependence of the magnetization induced by Goldstone
modes in the low-temperature phase is explicitly verified for both
models. The results are well described by the perturbative form of
the respective magnetic equations of state. We calculate the complete
scaling functions needed for the comparison to QCD. In addition,
finite size scaling functions on the critical and pseudocritical
lines are determined. |
| Froggatt, Colin |
No |
| Ichie, Hiroko |
The structure of color fluxtubes in SU(3):
We will discuss about the structure of color fluxtubes in SU(3)
in the view of dual superconductor picture. |
| Kaczmarek, Olaf |
The non-zero baryon number formulation of QCD
We discuss the thermodynamics of gluons in the background of static quark
sources. In order to do so we formulate the static limit of QCD at non-zero
baryon number in the canonical and grand-canonical approach. We compare both
approaches and discuss our results for baryon number densities of the order of
nuclear matter density. Our results for the heavy quark potential show string
breaking already in the hadronic phase, comparable to potentials in full
QCD. We analyze the chiral properties of light valence quarks in the background
of the static quark sources and find a decrease of the chiral condensate
compared to the zero density values.
|
| Kajantie, Keijo |
No |
| Karsch, Frithjof |
No |
| Laine, Mikko |
The free energy of hot QCD via dimensional reduction (I)
The free energy of QCD as a function of temperature is
a fundamental quantity, with applications in cosmology and heavy
ion collision experiments, and has been studied intensively for
two decades. It turns out that strict perturbation theory does not
work at any reasonable temperature, while 4d lattice simulations
work only in a narrow temperature range. I argue that
a combination of analytical and numerical methods permits one
to compute reliably the free energy from about two times the
critical temperature to infinity. In this first part, I discuss
the general status of dimensional reduction in 4d finite-T QCD.
The remainder is presented in the subsequent talk by Y. Schroder.
|
| Lilley, Matthew |
Yes |
| Montvay, Istvan |
No |
| Mueller-Preussker, Michael |
No |
| Petersson, Bengt |
Dimensional reduction of SU(3) in 2+1 dimensions:
I will compare the reduced and the full theory, discuss the domain
of validity, and the properties of the reduced model.
I will also discuss proposals for explicit Z_3 invariant reduced
model. |
| Rummukainen, Kari |
Bubble nucleation in the electroweak phase transition:
I discuss the calculation of the critical bubble nucleation rate in a
first order electroweak phase transition, using lattice
Monte Carlo techniques. The results include the contributions
both from the free energy of the critical bubbles and from the dynamical
prefactors. The method is well suited to first order transitions
with a strong metastability. |
| Schmidt, Christian |
Universality at the chiral critical point of 3-flavour QCD:
We analyze the critical behaviour of 3-flavor QCD in the vicinity
of the chiral
critical point, i.e. the second order endpoint of first order phase transition.
In order to find a mapping between 3-flavour QCD and the 3d Ising model we
introduce linear combinations of the gluonic action and the chiral
condensate. We consider these linear combinations as an approximation for the
correct ordering-field as well as energy-like operators and discuss their
fourth order cumulant and joint histogram for several mixing and mass
parameters. Our results yield a location of the chiral critical point and
supply evidence that for three flavours this point belongs to the
universality class of the 3d Ising model. |
| Schroder, York |
The free energy of hot QCD via dimensional reduction (II)
(for abstract, see M. Laine) |
| Scorzato, Luigi |
(joint talk with J. Skullerud) |
| Skullerud, Jonivar |
Chiral symmetry and diquark condensation in dense adjoint
matter
We report on a lattice study of two-colour QCD with adjoint
fermions at high density. We find that a spurious early onset and
chiral transition disappears when the sign of the fermion determinant
is taken properly into account. We report on results for diquark
condensation, from simulations with and without a diquark source term.
|