16,835 research outputs found
Admissible Clustering of Aggregator Components: A Necessary and Sufficient Stochastic Semi-Nonparametric Test for Weak Separability.
In aggregation theory, the admissibility condition for clustering together components to be aggregated is blockwise weak separability, which also is the condition needed to separate out sectors of the economy. Although weak separability is thereby of central importance in aggregation and index number theory and in econometrics, prior attempts to produce statistical tests of weak separability have performed poorly in Monte Carlo studies. This paper deals with semi- nonparametric tests for weak separability. It introduces both a necessary and su¢ cient test, and a fully stochastic procedure allowing to take into account measurement error. Simulations show that the test performs well, even for large measurement errors.weak separability, quantity aggregation, clustering, sectors, index number theory, semi-nonparametrics
Negative experimental evidence for magneto-orbital dichroism - supplemental information
A light beam can carry both spin angular momentum (SAM) and orbital angular
momentum (OAM). SAM is commonly evidenced by circular dichroism (CD)
experiments {\em i. e.} differential absorption of left and right-handed
circularly polarized light. Recent experiments, supported by theoretical work,
indicate that the corresponding effect with OAM instead of SAM is not observed
in chiral matter.
Isotropic materials can show CD when subjected to a magnetic field (MCD). In
Ref. ~\onlinecite{Mathevet2012} we report a set of experiments, under well
defined conditions, searching for magnetic orbital dichroism (MOD),
differential absorption of light as a function of the sign of its OAM. We
experimentally demonstrate that this effect, if any, is smaller than a few
of MCD for the Nd:YAG transition.
This transition is essentially of electric dipole nature. We give an intuitive
argument suggesting that the lowest order of light matter interaction leading
to MOD is the electric quadrupole term.
We give here more experimental details and extra measurements.Comment: 6 pages, 7 figures. Supplemental material for a publication in Optics
Expres
B spectroscopy using all-to-all propagators
We measure the ground and excited states for B mesons in the static limit
using maximally variance reduced estimators for light quark propagators.
Because of the large number of propagators we are able to measure accurately
also orbitally excited P, D and F states. We also present some results for
Lambda_b.Comment: 3 pages, 3 figures. Talk presented at Lattice '97 by J. Peis
Decoherence of number states in phase-sensitive reservoirs
The non-unitary evolution of initial number states in general Gaussian
environments is solved analytically. Decoherence in the channels is quantified
by determining explicitly the purity of the state at any time. The influence of
the squeezing of the bath on decoherence is discussed. The behavior of coherent
superpositions of number states is addressed as well.Comment: 5 pages, 2 figures, minor changes, references adde
Relativistic analysis of the dielectric Einstein box: Abraham, Minkowski and total energy-momentum tensors
We analyse the "Einstein box" thought experiment and the definition of the
momentum of light inside matter. We stress the importance of the total
energy-momentum tensor of the closed system (electromagnetic field plus
material medium) and derive in detail the relativistic expressions for the
Abraham and Minkowski momenta, together with the corresponding balance
equations for an isotropic and homogeneous medium. We identify some assumptions
hidden in the Einstein box argument, which make it weaker than it is usually
recognized. In particular, we show that the Abraham momentum is not uniquely
selected as the momentum of light in this case
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