523 research outputs found
Light-cone Wilson loop in classical lattice gauge theory
The transverse broadening of an energetic jet passing through a non-Abelian
plasma is believed to be described by the thermal expectation value of a
light-cone Wilson loop. In this exploratory study, we measure the light-cone
Wilson loop with classical lattice gauge theory simulations. We observe, as
suggested by previous studies, that there are strong interactions already at
short transverse distances, which may lead to more efficient jet quenching than
in leading-order perturbation theory. We also verify that the asymptotics of
the Wilson loop do not change qualitatively when crossing the light cone, which
supports arguments in the literature that infrared contributions to jet
quenching can be studied with dimensionally reduced simulations in the
space-like domain. Finally we speculate on possibilities for full
four-dimensional lattice studies of the same observable, perhaps by employing
shifted boundary conditions in order to simulate ensembles boosted by an
imaginary velocity.Comment: 20 pages. v2: more elaboration on systematic errors; published
versio
Improved real-time dynamics from imaginary frequency lattice simulations
The computation of real-time properties, such as transport coefficients or
bound state spectra of strongly interacting quantum fields in thermal
equilibrium is a pressing matter. Since the sign problem prevents a direct
evaluation of these quantities, lattice data needs to be analytically continued
from the Euclidean domain of the simulation to Minkowski time, in general an
ill-posed inverse problem. Here we report on a novel approach to improve the
determination of real-time information in the form of spectral functions by
setting up a simulation prescription in imaginary frequencies. By carefully
distinguishing between initial conditions and quantum dynamics one obtains
access to correlation functions also outside the conventional Matsubara
frequencies. In particular the range between and ,
which is most relevant for the inverse problem may be more highly resolved. In
combination with the fact that in imaginary frequencies the kernel of the
inverse problem is not an exponential but only a rational function we observe
significant improvements in the reconstruction of spectral functions,
demonstrated in a simple 0+1 dimensional scalar field theory toy model.Comment: 8 pages, 5 figures, Talk given at the XXXVth International Symposium
on Lattice Field Theory, June 18-24, 2017, Granada, Spai
Information Variability Impacts in Auctions
A wide variety of auction models exhibit close relationships between the winner's expected profit and the expected difference between the highest and second-highest order statistics of bidders' information, and between expected revenue and the second-highest order statistic of bidders' expected asset values. We use stochastic orderings to see when greater environmental variability of bidders' information enhances expected profit and expected revenue
Thermalization and dynamical spectral properties in the quark-meson model
We investigate the nonequilibrium evolution of the quark-meson model using
two-particle irreducible effective action techniques. Our numerical
simulations, which include the full dynamics of the order parameter of chiral
symmetry, show how the model thermalizes into different regions of its phase
diagram. In particular, by studying quark and meson spectral functions, we shed
light on the real-time dynamics approaching the crossover transition, revealing
e.g. the emergence of light effective fermionic degrees of freedom in the
infrared. At late times in the evolution, the fluctuation-dissipation relation
emerges naturally among both meson and quark degrees of freedom, confirming
that the simulation successfully reaches thermal equilibrium
Display blindness? Looking again at the visibility of situated displays using eye tracking
Observational studies of situated displays have suggested that they are rarely looked at, and when they are it is typically only for a short period of time. Using a mobile eye tracker during a realistic shopping task in a shopping center, we show that people look at displays more than would be predicted from these observational studies, but still only short glances and often from quite far away. We characterize the patterns of eye-movements that precede looking at a display and discuss some of the design implications for the design of situated display technologies that are deployed in public space
Quark-gluon plasma phenomenology from anisotropic lattice QCD
The FASTSUM collaboration has been carrying out simulations of N_f=2+1 QCD at
nonzero temperature in the fixed-scale approach using anisotropic lattices.
Here we present the status of these studies, including recent results for
electrical conductivity and charge diffusion, and heavy quarkonium (charm and
beauty) physics.Comment: Talk given at Quark Confinement and the Hadron Spectrum (Confinement
XI), 8-12 September, St. Petersburg, Russia. 8 pages, 7 figure
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