5,061 research outputs found
Selfduality of non-linear electrodynamics with derivative corrections
In this paper we investigate how electromagnetic duality survives derivative
corrections to classical non-linear electrodynamics. In particular, we
establish that electromagnetic selfduality is satisfied to all orders in
for the four-point function sector of the four dimensional open
string effective action.Comment: 8 page
Self-Interacting Electromagnetic Fields and a Classical Discussion on the Stability of the Electric Charge
The present work proposes a discussion on the self-energy of charged
particles in the framework of nonlinear electrodynamics. We seek magnet- ically
stable solutions generated by purely electric charges whose electric and
magnetic fields are computed as solutions to the Born-Infeld equa- tions. The
approach yields rich internal structures that can be described in terms of the
physical fields with explicit analytic solutions. This suggests that the
anomalous field probably originates from a magnetic excitation in the vacuum
due to the presence of the very intense electric field. In addition, the
magnetic contribution has been found to exert a negative pressure on the
charge. This, in turn, balances the electric repulsion, in such a way that the
self-interaction of the field appears as a simple and natural classical
mechanism that is able to account for the stability of the electron charge.Comment: 8 pages, 1 figur
Internal structures of electrons and photons: the concept of extended particles revisited
The theoretical foundations of quantum mechanics and de Broglie--Bohm
mechanics are analyzed and it is shown that both theories employ a formal
approach to microphysics. By using a realistic approach it can be established
that the internal structures of extended particles comply with a wave-equation.
Including external potentials yields the Schrodinger equation, which, in this
context, is arbitrary due to internal energy components. The statistical
interpretation of wave functions in quantum theory as well as Heisenberg's
uncertainty relations are shown to be an expression of this, fundamental,
arbitrariness. Electrons and photons can be described by an identical
formalism, providing formulations equivalent to the Maxwell equations.
Electrostatic interactions justify the initial assumption of electron-wave
stability: the stability of electron waves can be referred to vanishing
intrinsic fields of interaction. The theory finally points out some fundamental
difficulties for a fully covariant formulation of quantum electrodynamics,
which seem to be related to the existing infinity problems in this field.Comment: 14 pages (RevTeX one column) and 1 figure (eps). For a full list of
available papers see http://info.tuwien.ac.at/cms/wh
Misleading signposts along the de Broglie-Bohm road to quantum mechanics
Eighty years after de Broglie's, and a little more than half a century after
Bohm's seminal papers, the de Broglie--Bohm theory (a.k.a. Bohmian mechanics),
which is presumably the simplest theory which explains the orthodox quantum
mechanics formalism, has reached an exemplary state of conceptual clarity and
mathematical integrity. No other theory of quantum mechanics comes even close.
Yet anyone curious enough to walk this road to quantum mechanics is soon being
confused by many misleading signposts that have been put up, and not just by
its detractors, but unfortunately enough also by some of its proponents.
This paper outlines a road map to help navigate ones way.Comment: Dedicated to Jeffrey Bub on occasion of his 65th birthday. Accepted
for publication in Foundations of Physics. A "slip of pen" in the
bibliography has been corrected -- thanks go to Oliver Passon for catching
it
Wave and Particle Limit for Multiple Barrier Tunneling
The particle approach to one-dimensional potential scattering is applied to
non relativistic tunnelling between two, three and four identical barriers. We
demonstrate as expected that the infinite sum of particle contributions yield
the plane wave results. In particular, the existence of resonance/transparency
for twin tunnelling in the wave limit is immediately obvious. The known
resonances for three and four barriers are also derived. The transition from
the wave limit to the particle limit is exhibit numerically.Comment: 15 pages, 3 figure
Bogomol'nyi Bounds and the Supersymmetric Born-Infeld Theory
We study N=2 supersymmetric Born-Infeld-Higgs theory in 3 dimensions and
derive Bogomol'nyi relations in its bosonic sector. A peculiar coupling between
the Higgs and the gauge field (with dynamics determined by the Born-Infeld
action) is forced by supersymmetry. The resulting equations coincide with those
arising in the Maxwell-Higgs model. Concerning Bogomol'nyi bounds for the
vortex energy, they are derived from the N=2 supersymmetry algebra.Comment: 24 pages, Latex fil
Epsilons Near Zero limits in the Mie scattering theory
The classical Mie theory - electromagnetic radiation scattering by the
homogeneous spherical particles - is considered in the epsilon near zero limits
separately for the materials of the particles and the surrounding medium. The
maxima of a scattered transverse electrical (TE) field for the surrounding
medium materials with the epsilon near zero limits are revealed. The effective
multipole polarizabilities of the corresponding scattering particles are
investigated. The possibility to achieve magnetic dipole resonance and
accordingly to construct metamaterials with negative refractive index for the
aggregates spherical particles in surrounding medium with the epsilon near zero
limits is considered.Comment: 8 pages, 6 figure
Polaron action for multimode dispersive phonon systems
Path-integral approach to the tight-binding polaron is extended to multiple
optical phonon modes of arbitrary dispersion and polarization. The non-linear
lattice effects are neglected. Only one electron band is considered. The
electron-phonon interaction is of the density-displacement type, but can be of
arbitrary spatial range and shape. Feynman's analytical integration of ion
trajectories is performed by transforming the electron-ion forces to the basis
in which the phonon dynamical matrix is diagonal. The resulting polaron action
is derived for the periodic and shifted boundary conditions in imaginary time.
The former can be used for calculating polaron thermodynamics while the latter
for the polaron mass and spectrum. The developed formalism is the analytical
basis for numerical analysis of such models by path-integral Monte Carlo
methods.Comment: 9 page
Efficient data processing and quantum phenomena: Single-particle systems
We study the relation between the acquisition and analysis of data and
quantum theory using a probabilistic and deterministic model for photon
polarizers. We introduce criteria for efficient processing of data and then use
these criteria to demonstrate that efficient processing of the data contained
in single events is equivalent to the observation that Malus' law holds. A
strictly deterministic process that also yields Malus' law is analyzed in
detail. We present a performance analysis of the probabilistic and
deterministic model of the photon polarizer. The latter is an adaptive
dynamical system that has primitive learning capabilities. This additional
feature has recently been shown to be sufficient to perform event-by-event
simulations of interference phenomena, without using concepts of wave
mechanics. We illustrate this by presenting results for a system of two chained
Mach-Zehnder interferometers, suggesting that systems that perform efficient
data processing and have learning capability are able to exhibit behavior that
is usually attributed to quantum systems only.Comment: http://www.compphys.net/dl
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