10,137 research outputs found
Three-antenna two-dimensional imaging correlation radiometer: concept and preliminary results
Peer ReviewedPostprint (published version
Magnetic charge superselection in the deconfined phase of Yang-Mills theory
The vacuum expectation value of an operator carrying magnetic charge is
studied numerically for temperatures above the deconfinement temperature in
SU(2) and SU(3) gauge theory. By analyzing its finite size behaviour, this is
found to be exactly zero in the thermodynamical limit for any T > T_c whenever
the magnetic charge of the operator is different from zero. These results show
that magnetic charge is superselected in the hot phase of quenched QCD.Comment: 4 pages, 6 figures, revtex
Counterion correlations and attraction between like-charged macromolecules
A simple model is presented for the appearance of attraction between two like
charged polyions inside a polyelectrolyte solution. The polyions are modeled as
rigid cylinders in a continuum dielectric solvent. The strong electrostatic
interactions between the polyions and the counterions results in counterion
condensation. If the two polyions are sufficiently close to each other their
layers of condensed counterions can become correlated resulting in attraction
between the macromolecules. To explore the counterion induced attraction we
calculate the correlation functions for the condensed counterions. It is found
that the correlations are of very short range. For the parameters specific to
the double stranded DNA, the correlations and the attraction appear only when
the surface-to-surface separation is less than 7 /AA.Comment: 6 pages, 8 eps figures, RevTeX with epsfi
Wegner-Houghton equation in low dimensions
We consider scalar field theories in dimensions lower than four in the
context of the Wegner-Houghton renormalization group equations (WHRG). The
renormalized trajectory makes a non-perturbative interpolation between the
ultraviolet and the infrared scaling regimes. Strong indication is found that
in two dimensions and below the models with polynomial interaction are always
non-perturbative in the infrared scaling regime. Finally we check that these
results do not depend on the regularization and we develop a lattice version of
the WHRG in two dimensions.Comment: 44 pages, 9 figures; some sections revised, refs. added; final
version to appear in Phys. Rev.
Regularity of solutions to a fractional elliptic problem with mixed Dirichlet-Neumann boundary data
In this work we study regularity properties of solutions to fractional
elliptic problems with mixed Dirichlet-Neumann boundary data when dealing with
the Spectral Fractional Laplacian
The valuation of clean spread options: linking electricity, emissions and fuels
The purpose of the paper is to present a new pricing method for clean spread options, and to illustrate its main features on a set of numerical examples produced by a dedicated computer code. The novelty of the approach is embedded in the use of a structural model as opposed to reduced-form models which fail to capture properly the fundamental dependencies between the economic factors entering the production process
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