151 research outputs found
Non-perturbative gluon evolution, squeezing, correlations and chaos in jets
We study evolution of colour gluon states in isolated QCD jet at the
non-perturbative stage. Fluctuations of gluons are less than those for coherent
states under specific conditions. This fact suggests that there gluon squeezed
states can arise. The angular and rapidity dependencies of the normalized
second-order correlation function for present gluon states are studied at this
stage of jet evolution. It is shown that these new gluon states can have both
sub-Poissonian and super-Poissonian statistics corresponding to, respectively,
antibunching and bunching of gluons by analogy with squeezed photon states.
We investigate the possibility of coexisting both squeezing and chaos using
Toda criterion and temporal correlator analysis. It is shown that these effects
may coexist under some conditions.Comment: 18 pages, 3 figures, Reported on IPPP Workshop on Multiparticle
Production in QCD Jets (University of Durham, Durham, UK, 12-15 December
2001
Gas phase Raman spectroscopy: Comparison of continuous wave and cavity based methods
© 2018 The Author(s). Comparison of cavity-enhanced Raman spectroscopy to continuous wave detection for gas phase molecules in air. We show continuous measurements with calculated emission and discuss the potential benefits (two orders more signal) of using a cavity.EPSR
Chaos assisted instanton tunneling in one dimensional perturbed periodic potential
For the system with one-dimensional spatially periodic potential we
demonstrate that small periodic in time perturbation results in appearance of
chaotic instanton solutions. We estimate parameter of local instability, width
of stochastic layer and correlator for perturbed instanton solutions.
Application of the instanton technique enables to calculate the amplitude of
the tunneling, the form of the spectrum and the lower bound for width of the
ground quasienergy zone
Velocity field distributions due to ideal line vortices
We evaluate numerically the velocity field distributions produced by a
bounded, two-dimensional fluid model consisting of a collection of parallel
ideal line vortices. We sample at many spatial points inside a rigid circular
boundary. We focus on ``nearest neighbor'' contributions that result from
vortices that fall (randomly) very close to the spatial points where the
velocity is being sampled. We confirm that these events lead to a non-Gaussian
high-velocity ``tail'' on an otherwise Gaussian distribution function for the
Eulerian velocity field. We also investigate the behavior of distributions that
do not have equilibrium mean-field probability distributions that are uniform
inside the circle, but instead correspond to both higher and lower mean-field
energies than those associated with the uniform vorticity distribution. We find
substantial differences between these and the uniform case.Comment: 21 pages, 9 figures. To be published in Physical Review E
(http://pre.aps.org/) in May 200
Kramers-Moyall cumulant expansion for the probability distribution of parallel transporters in quantum gauge fields
A general equation for the probability distribution of parallel transporters
on the gauge group manifold is derived using the cumulant expansion theorem.
This equation is shown to have a general form known as the Kramers-Moyall
cumulant expansion in the theory of random walks, the coefficients of the
expansion being directly related to nonperturbative cumulants of the shifted
curvature tensor. In the limit of a gaussian-dominated QCD vacuum the obtained
equation reduces to the well-known heat kernel equation on the group manifold.Comment: 7 page
The spatial correlations in the velocities arising from a random distribution of point vortices
This paper is devoted to a statistical analysis of the velocity fluctuations
arising from a random distribution of point vortices in two-dimensional
turbulence. Exact results are derived for the correlations in the velocities
occurring at two points separated by an arbitrary distance. We find that the
spatial correlation function decays extremely slowly with the distance. We
discuss the analogy with the statistics of the gravitational field in stellar
systems.Comment: 37 pages in RevTeX format (no figure); submitted to Physics of Fluid
IMPLEMENTATION OF A HIGH-EFFICIENT ELEMENTARY HEATER IN THE CIRCUIT OF AN EXISTING EVAPORATOR WITH THE PURPOSE OF SAVING HEATING STEAM
he paper gives a brief description of the method for producing alumina (Al2O3) by the Bayer method.This work was supported by the Russian Foundation for Basic Research (grant # 19-53-55002)
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