24,817 research outputs found
Nonpecuniary Class Action Settlements
Miller and Singer offer a theoretical and empirical analysis of nonpecuniary class action settlements, including coupons, securities and fluid recoveries
Rapid Bayesian position reconstruction for gravitational-wave transients
Within the next few years, Advanced LIGO and Virgo should detect
gravitational waves from binary neutron star and neutron star-black hole
mergers. These sources are also predicted to power a broad array of
electromagnetic transients. Because the electromagnetic signatures can be faint
and fade rapidly, observing them hinges on rapidly inferring the sky location
from the gravitational-wave observations. Markov chain Monte Carlo methods for
gravitational-wave parameter estimation can take hours or more. We introduce
BAYESTAR, a rapid, Bayesian, non-Markov chain Monte Carlo sky localization
algorithm that takes just seconds to produce probability sky maps that are
comparable in accuracy to the full analysis. Prompt localizations from BAYESTAR
will make it possible to search electromagnetic counterparts of compact binary
mergers.Comment: 23 pages, 12 figures, published in Phys. Rev.
Long distance contributions in decays
Using the factorization scheme for the nonleptonic weak
amplitudes, we classify all diagrams which arise in decays and
calculate them with the help of the hybrid model which combines the heavy quark
effective theory and the chiral Lagrangian approach. Thus we determine the long
distance contribution to the amplitudes of Cabibbo allowed and Cabibbo
suppressed decays. The calculation of the expected range of the
branching ratios of nine different channels is compared with
results of other approaches. The present work establishes an increase of the
parity violating contribution in these decays in comparison with previous
analyses.Comment: 15 pages, latex, 2 figures; we have changed Table 2 and the caption
of Table 1. To be published in Eur. Phys.
Vegetarianism
Ethical vegetarians maintain that vegetarianism is morally required. The principal reasons offered in support of ethical vegetarianism are: (i) concern for the welfare and well-being of the animals being eaten, (ii) concern for the environment, (iii) concern over global food scarcity and the just distribution of resources, and (iv) concern for future generations. Each of these reasons is explored in turn, starting with a historical look at ethical vegetarianism and the moral status of animals
(63)Cu NQR Evidence for Spatial Variation of Hole Concentration in La(2-x)Sr(x)CuO(4)
We report experimental evidence for the spatial variation of hole
concentration x_(hole) in the high Tc superconductor La(2-x)Sr(x)CuO(4) (0.04
<= x <= 0.16) by using (63)Cu NQR for (63)Cu isotope enriched samples. We
demonstrate that the extent of the spatial variation of the local hole
concentration D(x)_(hole) is reflected on (63)1/T1 and deduce the temperature
dependence. D(x)_(hole) increases below 500 - 600K, and reaches values as large
as D(x)_(hole)/x ~ 0.5 below ~ 150K. We estimate the length scale of the
spatial variation in x_(hole) to be R_(hole) >~ 3nm from analysis of the NQR
spectrum.Comment: Accepted for publication in Physical Review Letter
Theories with global gauge anomalies on the lattice
A global anomaly in a chiral gauge theory manifests itself in different ways
in the continuum and on the lattice. In the continuum case, functional
integration of the fermion determinant over the whole space of gauge fields
yields zero. In the case of the lattice, it is not even possible to define a
fermion measure over the whole space of gauge configurations. However, this is
not necessary, and as in the continuum, a reduced functional integral is
sufficient for the existence of the theory.Comment: Lattice 2000 (Topics in gauge theories); LaTeX with espcrc2, 4 page
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