3,693 research outputs found
Photon mass via current confinement
A parity invariant theory, consisting of two massive Dirac fields, defined in
three dimensional space-time, with the confinement of a certain current is
studied. It is found that the electromagnetic field, when coupled minimally to
these Dirac fields, becomes massive owing to the current confinement. It is
seen that the origin of photon mass is not due to any kind of spontaneous
symmetry breaking, but only due to current confinement.Comment: LaTeX2e, 14 pages, No figures, to appear in Physics Letters B. arXiv
admin note: text overlap with arXiv:1107.552
Entanglement induced Sub-Planck structures
We study Wigner function of a system describing entanglement of two
cat-states. Quantum interferece arising due to entanglement is shown to produce
sub-Planck structures in the phase-space plots of the Wigner function. Origin
of these structures in our case depends on entanglement unlike those in Zurek
\cite{Zurek}. It is argued that the entangled cat-states are better suited for
carrying out precision measurements.Comment: 6 pages 2 figures (revised version include more quantitative
discussion
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