13,505 research outputs found
Quantum Flux and Reverse Engineering of Quantum Wavefunctions
An interpretation of the probability flux is given, based on a derivation of
its eigenstates and relating them to coherent state projections on a quantum
wavefunction. An extended definition of the flux operator is obtained using
coherent states. We present a "processed Husimi" representation, which makes
decisions using many Husimi projections at each location. The processed Husimi
representation reverse engineers or deconstructs the wavefunction, yielding the
underlying classical ray structure. Our approach makes possible interpreting
the dynamics of systems where the probability flux is uniformly zero or
strongly misleading. The new technique is demonstrated by the calculation of
particle flow maps of the classical dynamics underlying a quantum wavefunction.Comment: Accepted to EP
Computer experiments to determine whether over- or under-counting necessarily affects the determination of difference in cell number between experimental groups
Cataloged from PDF version of article.Computer cell counting experiments were performed in order to examine the consequences of over- or under-counting. The
three-dimensional reaggregate culture laboratory environment for cell counting was used as a model for computer simulation. The
laboratory environment for aggregate and cell sizes, numbers and spatial placement in gelatin blocks was mimicked in the
computer setup. However, in the computer, cell counting was set to be either ideally unbiased, or deliberately biased in regard to
over- or under-counting so as to compare eventual results when using the various cell counting methods. It was found that there
was no effect of the cell counting methods used in determining whether there was a significant difference in cell number between
two experimental groups. In addition, it was found that under the conditions of these simulations, the optical disector method
behaved similarly, on the average, as the ideal method of counting cell centers and in both of those cases, the average ratio
between actual cell number in a flask and estimated number was close to 1.00. © 2001 Elsevier Science B.V. All rights reserved
Scarring by homoclinic and heteroclinic orbits
In addition to the well known scarring effect of periodic orbits, we show
here that homoclinic and heteroclinic orbits, which are cornerstones in the
theory of classical chaos, also scar eigenfunctions of classically chaotic
systems when associated closed circuits in phase space are properly quantized,
thus introducing strong quantum correlations. The corresponding quantization
rules are also established. This opens the door for developing computationally
tractable methods to calculate eigenstates of chaotic systems.Comment: 5 pages, 4 figure
The Non-Perturbative Contribution to the Free Energy of Hot SU(N) Gauge Theory
The non-perturbative input necessary for the determination of the part of the weak coupling expansion of the free energy density for
SU(2) and SU(3) gauge theories is estimated. Although the perturbative
information completing the contribution to this order is missing, we give
arguments that the magnetic fluctuations are dominated by screened elementary
magnetic gluons.Comment: Talk presented at LATTICE96(finite temperature) 3 pages Latex2e, 3 ps
figures, 14 k
MUNDO - Digital Programm zur Berechnung von Unfalldosen in der Umgebung einer Reaktoranlage. EUR 3684. = MUNDO - Digital program for the calculation of accidents in the vicinity of a reactor plant. EUR 3684.
Screening in Hot SU(2) Gauge Theory and Propagators in 3d Adjoint Higgs model
We investigate the large distance behavior of the electric and magnetic
propagators of hot SU(2) gauge theory in different gauges using lattice
simulations of the full 4d theory and the effective, dimensionally reduced 3d
theory. A comparison of the 3d and 4d data for the propagators suggests that
dimensional reduction works surprisingly well down to temperatures T=2 T_c. A
detailed study of the volume dependence of magnetic propagators is performed.
The electric propagators show exponential decay at large distances in all
gauges considered and a possible gauge dependence of the electric screening
mass turns out to be statistically insignificant.Comment: Submitted to Proceedings of Lattice 2000 and Workshop "Strong and
Electroweak Matter 2000". LaTeX uses espcrc2.st
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