1,712 research outputs found
Pomerons and Lattices: a Progress Report
We report on some attempts to use lattice QCD to investigate topics in strong
interactions phenomenology which are usually interpreted in terms of soft
Pomeron exchange.Comment: Talk presented at LAT96, 3 pages, Latex, one style file and 2
PostScript pictures include
The Gluon Propagator in Momentum Space
We give preliminary numerical results for the gluon propagator evaluated both
in coordinate and momentum space on a 16^3X40 quenched lattice at beta=6.0. Our
findings are compared with earlier results in the literature at zero momentum.
In addition, by considering nonzero momenta we attempt to extract the form of
the propagator and compare it to continuum predictions formulated by Gribov and
others. latex, file espcrc2.sty needed (appended at the end: search for
espcrc2.sty).Comment: 4 page
Search for Lambda^2/p^2 corrections to the QCD running coupling
We investigate the occurrence of power terms in the running
QCD coupling by analysing non-perturbative measurements of at
quite low momenta obtained from the lattice three-gluon vertex. Our study
provides some evidence for such a contribution. The phenomenological
implications of such a presence are reviewed.Comment: 3 pages, 1 figure, LaTeX, LATTICE98(Confinement
Status of alpha_s determinations from the non-perturbatively renormalised three-gluon vertex
We demonstrate the feasibility of computing alpha_s from the lattice
three-gluon vertex in the Landau gauge. Data from 16^4 and 24^4 quenched
lattices at beta=6.0 are presented. Our main result is that 2-loop asymptotic
scaling is observed for momenta in the range 1.8-2.3 Gev, where lattice
artifacts appear to be under control.Comment: 3 pages, LaTeX, 2 PostScript pictures and style file included. To
appear in the proceedings of LAT9
Canonical sampling through velocity-rescaling
We present a new molecular dynamics algorithm for sampling the canonical
distribution. In this approach the velocities of all the particles are rescaled
by a properly chosen random factor. The algorithm is formally justified and it
is shown that, in spite of its stochastic nature, a quantity can still be
defined that remains constant during the evolution. In numerical applications
this quantity can be used to measure the accuracy of the sampling. We
illustrate the properties of this new method on Lennard-Jones and TIP4P water
models in the solid and liquid phases. Its performance is excellent and largely
independent on the thermostat parameter also with regard to the dynamic
properties
- …