4,289 research outputs found
Loss-Avoidance and Forward Induction in Experimental Coordination Games
We report experiments on how players select among multiple Pareto-ranked
equilibria in a coordination game. Subjects initially choose inefficient equilibria.
Charging a fee to play (which makes initial equilibria money-losing) creates coordination
on better equilibria. When fees are optional, improved coordination is
consistent with forward induction. But coordination improves even when subjects
must pay the fee (forward induction does not apply). Subjects appear to use a
"loss-avoidance" selection principle: they expect others to avoid strategies that
always result in losses. Loss-avoidance implies that "mental accounting" of outcomes
can affect choices in games
Survival before annihilation in Psi-prime decays
We extend the simple scenario for decays suggested a few years ago.
The pair in the does not annihilate directly into three
gluons but rather survives before annihilating. An interesting prediction is
that a large fraction of all decays could originate from the channel which we urge experimentalists to identify. Our model
solves the problem of the apparent hadronic excess in decays as well as
the puzzle since, in our view, the two-body decays of the are
naturally of electromagnetic origin. Further tests of this picture are
proposed, e.g. .Comment: 6 pages, no figur
Phase Space Models for Stochastic Nonlinear Parabolic Waves: Wave Spread and Singularity
We derive several kinetic equations to model the large scale, low Fresnel
number behavior of the nonlinear Schrodinger (NLS) equation with a rapidly
fluctuating random potential. There are three types of kinetic equations the
longitudinal, the transverse and the longitudinal with friction. For these
nonlinear kinetic equations we address two problems: the rate of dispersion and
the singularity formation.
For the problem of dispersion, we show that the kinetic equations of the
longitudinal type produce the cubic-in-time law, that the transverse type
produce the quadratic-in-time law and that the one with friction produces the
linear-in-time law for the variance prior to any singularity.
For the problem of singularity, we show that the singularity and blow-up
conditions in the transverse case remain the same as those for the homogeneous
NLS equation with critical or supercritical self-focusing nonlinearity, but
they have changed in the longitudinal case and in the frictional case due to
the evolution of the Hamiltonian
Controlling the dynamics of a coupled atom-cavity system by pure dephasing : basics and potential applications in nanophotonics
The influence of pure dephasing on the dynamics of the coupling between a
two-level atom and a cavity mode is systematically addressed. We have derived
an effective atom-cavity coupling rate that is shown to be a key parameter in
the physics of the problem, allowing to generalize the known expression for the
Purcell factor to the case of broad emitters, and to define strategies to
optimize the performances of broad emitters-based single photon sources.
Moreover, pure dephasing is shown to be able to restore lasing in presence of
detuning, a further demonstration that decoherence can be seen as a fundamental
resource in solid-state cavity quantum electrodynamics, offering appealing
perspectives in the context of advanced nano-photonic devices.Comment: 10 pages, 7 figure
Unique Minimal Liftings for Simplicial Polytopes
For a minimal inequality derived from a maximal lattice-free simplicial
polytope in , we investigate the region where minimal liftings are
uniquely defined, and we characterize when this region covers . We then
use this characterization to show that a minimal inequality derived from a
maximal lattice-free simplex in with exactly one lattice point in the
relative interior of each facet has a unique minimal lifting if and only if all
the vertices of the simplex are lattice points.Comment: 15 page
HI emission from the red giant Y CVn with the VLA and FAST
Imaging studies with the VLA have revealed HI emission associated with the
extended circumstellar shells of red giants. We analyse the spectral map
obtained on Y CVn, a J-type carbon star on the AGB. The HI line profiles can be
interpreted with a model of a detached shell resulting from the interaction of
a stellar outflow with the local interstellar medium. We reproduce the spectral
map by introducing a distortion along a direction corresponding to the star's
motion in space. We then use this fitting to simulate observations expected
from the FAST radiotelescope, and discuss its potential for improving
ourdescription of the outer regions of circumstellar shells.Comment: accepted for publication in RA
Wigner Measure Propagation and Conical Singularity for General Initial Data
We study the evolution of Wigner measures of a family of solutions of a
Schr\"odinger equation with a scalar potential displaying a conical
singularity. Under a genericity assumption, classical trajectories exist and
are unique, thus the question of the propagation of Wigner measures along these
trajectories becomes relevant. We prove the propagation for general initial
data.Comment: 24 pages, 1 figur
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