23,320 research outputs found
Classical and quantum interference in multiband optical Bloch oscillations
Classical and quantum interference of light propagating in arrays of coupled
waveguides and undergoing multiband optical Bloch oscillations (BOs) with
negligible Zener tunneling is theoretically investigated. In particular, it is
shown that Mach-Zehnder-like interference effects spontaneously arise in
multiband BOs owing to beam splitting and subsequent beam recombination
occurring in one BO cycle. As a noteworthy example of quantum interference, we
discuss the doubling of interference fringes in photon counting rates for a
correlated photon pair undergoing two-band BOs, a phenomenon analogous to the
manifestation of the de Broglie wavelength of an entangled biphoton state
observed in quantum Mach-Zehnder interferometry.Comment: 11 pages, 4 figure
Reverse and dual Loomis-Whitney-type inequalities
Various results are proved giving lower bounds for the th intrinsic volume
, , of a compact convex set in , in
terms of the th intrinsic volumes of its projections on the coordinate
hyperplanes (or its intersections with the coordinate hyperplanes). The bounds
are sharp when and . These are reverse (or dual, respectively)
forms of the Loomis-Whitney inequality and versions of it that apply to
intrinsic volumes. For the intrinsic volume , which corresponds to mean
width, the inequality obtained confirms a conjecture of Betke and McMullen made
in 1983
The constrained E6SSM
We discuss the predictions of a constrained version of the exceptional
supersymmetric standard model (cE6SSM), with a universal high energy soft
scalar mass, soft trilinear coupling and soft gaugino mass. The spectrum
includes a light gluino, a light wino-like neutralino and chargino pair and a
light bino-like neutralino, with other sparticle masses except the lighter stop
being much heavier. We also discuss scenarios with an extra light exotic colour
triplet of fermions and scalars and a TeV scale Z', which lead to early exotic
physics signals at the LHC.Comment: To appear in proceedings of The 2009 Europhysics Conference on High
Energy Physics, 16-22 July 2009 Krakow, Poland; 4 page
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