3,709 research outputs found
The confined-deconfined interface tension, wetting, and the spectrum of the transfer matrix
The reduced tension of the interface between the confined and
the deconfined phase of pure gauge theory is determined from numerical
simulations of the first transfer matrix eigenvalues. At we find
for . The interfaces show universal
behavior because the deconfined-deconfined interfaces are completely wet by the
confined phase. The critical exponents of complete wetting follow from the
analytic interface solutions of a -symmetric model in three
dimensions. We find numerical evidence that the confined-deconfined interface
is rough.Comment: Talk presented at the International Conference on Lattice Field
Theory, Lattice 92, to be published in the proceedings, 4 pages, 4 figures,
figures 2,3,4 appended as postscript files, figure 1 not available as a
postscript file but identical with figure 2 of Nucl. Phys. B372 (1992) 703,
special style file espcrc2.sty required (available from hep-lat), BUTP-92/4
Hidden Extra U(1) at the Electroweak/TeV Scale
We propose a simple extension of the Standard Model (SM) by adding an extra
U(1) symmetry which is hidden from the SM sector. Such a hidden U(1) has not
been considered before, and its existence at the TeV scale can be explored at
the LHC. This hidden U(1) does not couple directly to the SM particles, and
couples only to new SU(2)_L singlet exotic quarks and singlet Higgs bosons, and
is broken at the TeV scale. The dominant signals at the high energy hadron
colliders are multi lepton and multi b-jet final states with or without missing
energy. We calculate the signal rates as well as the corresponding Standard
Model background for these final states. A very distinctive signal is 6 high
p_T b-jets in the final state with no missing energy. For a wide range of the
exotic quarks masses the signals are observable above the background at the
LHC.Comment: 19 pages, 5 figure
The Confined-Deconfined Interface Tension in Quenched QCD using the Histogram Method
We present results for the confinement-deconfinement interface tension
of quenched QCD. They were obtained by applying Binder's
histogram method to lattices of size for and
L=8,10,12\mbox{ and }14 and various . The use of a
multicanonical algorithm and rectangular geometries have turned out to be
crucial for the numerical studies. We also give an estimate for
at using published data.Comment: 15 pages, 9 figures (of which 2 are included, requiring the epsf
style file), preprint HLRZ-93-
The Interface Tension in Quenched QCD at the Critical Temperature
We present results for the confinement-deconfinement interface tension
of quenched QCD. They were obtained by applying Binder's
histogram method to lattices of size for and
L=8,10,12\mbox{ and }14 with for and otherwise. The
use of a multicanonical algorithm and cylindrical geometries have turned out to
be crucial for the numerical studies.Comment: (talk presented by B. Grossmann at Lattice 92), 4 pages with 5 figure
appended as encapsulated postscript files at the end, preprint HLRZ-92-7
Interface Tensions and Perfect Wetting in the Two-Dimensional Seven-State Potts Model
We present a numerical determination of the order-disorder interface tension,
\sod, for the two-dimensional seven-state Potts model. We find
\sod=0.0114\pm0.0012, in good agreement with expectations based on the
conjecture of perfect wetting. We take into account systematic effects on the
technique of our choice: the histogram method. Our measurements are performed
on rectangular lattices, so that the histograms contain identifiable plateaus.
The lattice sizes are chosen to be large compared to the physical correlation
length. Capillary wave corrections are applied to our measurements on finite
systems.Comment: 8 pages, LaTex file, 2 postscript figures appended, HLRZ 63/9
The confined-deconfined Interface Tension and the Spectrum of the Transfer Matrix
The reduced tension of the interface between the confined and
the deconfined phase of pure gauge theory is related to the finite size
effects of the first transfer matrix eigenvalues. A lattice simulation of the
transfer matrix spectrum at the critical temperature yields
for . We found numerical evidence that
the deconfined-deconfined domain walls are completely wet by the confined
phase, and that the confined-deconfined interfaces are rough.Comment: 22 pages, LaTeX file with 4 ps figures included, HLRZ 92-47,
BUTP-92/3
First Order Phase Transition in a Reaction-Diffusion Model With Open Boundary: The Yang-Lee Theory Approach
A coagulation-decoagulation model is introduced on a chain of length L with
open boundary. The model consists of one species of particles which diffuse,
coagulate and decoagulate preferentially in the leftward direction. They are
also injected and extracted from the left boundary with different rates. We
will show that on a specific plane in the space of parameters, the steady state
weights can be calculated exactly using a matrix product method. The model
exhibits a first-order phase transition between a low-density and a
high-density phase. The density profile of the particles in each phase is
obtained both analytically and using the Monte Carlo Simulation. The two-point
density-density correlation function in each phase has also been calculated. By
applying the Yang-Lee theory we can predict the same phase diagram for the
model. This model is further evidence for the applicability of the Yang-Lee
theory in the non-equilibrium statistical mechanics context.Comment: 10 Pages, 3 Figures, To appear in Journal of Physics A: Mathematical
and Genera
Classification of phase transitions of finite Bose-Einstein condensates in power law traps by Fisher zeros
We present a detailed description of a classification scheme for phase
transitions in finite systems based on the distribution of Fisher zeros of the
canonical partition function in the complex temperature plane. We apply this
scheme to finite Bose-systems in power law traps within a semi-analytic
approach with a continuous one-particle density of states for different values of and to a three dimensional harmonically
confined ideal Bose-gas with discrete energy levels. Our results indicate that
the order of the Bose-Einstein condensation phase transition sensitively
depends on the confining potential.Comment: 7 pages, 9 eps-figures, For recent information on physics of small
systems see "http://www.smallsystems.de
Obtaining Maxwell's equations heuristically
Starting from the experimental fact that a moving charge experiences the
Lorentz force and applying the fundamental principles of simplicity (first
order derivatives only) and linearity (superposition principle), we show that
the structure of the microscopic Maxwell equations for the electromagnetic
fields can be deduced heuristically by using the transformation properties of
the fields under space inversion and time reversal. Using the experimental
facts of charge conservation and that electromagnetic waves propagate with the
speed of light together with Galileo invariance of the Lorentz force allows us
to introduce arbitrary electrodynamic units naturally.Comment: 11 page
The scientific evaluation of music content analysis systems: Valid empirical foundations for future real-world impact
We discuss the problem of music content analysis within the formal framework of experimental design
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