2,946 research outputs found
Light emission by accelerated electric, toroidal and anapole dipolar sources
Emission of electromagnetic radiation by accelerated particles with electric,
toroidal and anapole dipole moments is analyzed. It is shown that ellipticity
of the emitted light can be used to differentiate between electric and toroidal
dipole sources, and that anapoles, elementary neutral non-radiating
configurations, which consist of electric and toroidal dipoles, can emit light
under uniform acceleration. The existence of non-radiating configurations in
electrodynamics implies that it is impossible to fully determine the internal
makeup of the emitter given only the distribution of the emitted light. Here we
demonstrate that there is a loop-hole in this `inverse source problem'. Our
results imply that there may be a whole range of new phenomena to be discovered
by studying the electromagnetic response of matter under acceleration.Comment: Change from previous version. Further corrections to figure 1. Much
more calculations in the main paper. Added a section on ellipticit
Dielectric Response in Microscopically Heterogeneous Dielectrics: Example of KTaO_3:Nb
New experimental data on solid solutions of quantum paraelectrics with
KTaO_3:Nb as an example are considered within a framework of a quantum theory
of ferroelectric phase transitions. In order to describe the effect of local
heterogeneities a percolation type theory together with a random field approach
were employed.Comment: 4 figure
Preliminary Results on gamma gamma -> Ks K pi from CLEO
We analyzed 13.8 fb^{-1} of the integrated e+e- luminosity collected at 10.6
GeV center-of-mass energy with the CLEO II and II.V detectors to study
exclusive two-photon production of single hadronic resonances. We searched for
hadrons decaying into Ks K pi when both leptons remain undetected. In this
analysis we studied the detection efficiency and evaluated systematic errors
using independent data samples. We estimated 90% CL upper limits on the
products of the two-photon partial widths of (pseudo)scalar hadrons with masses
below 1.7 GeV/c2 and their branching fractions into Ks K pi. Our preliminary
results are marginally consistent with the first observation of eta(1440) in
two-photon collisions by the L3 experiment.Comment: 4 pages, 1 figure, proceedings contribution for PANIC'0
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