2,374 research outputs found
Matching with shift for one-dimensional Gibbs measures
We consider matching with shifts for Gibbsian sequences. We prove that the
maximal overlap behaves as , where is explicitly identified in
terms of the thermodynamic quantities (pressure) of the underlying potential.
Our approach is based on the analysis of the first and second moment of the
number of overlaps of a given size. We treat both the case of equal sequences
(and nonzero shifts) and independent sequences.Comment: Published in at http://dx.doi.org/10.1214/08-AAP588 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org
A concentration inequality for interval maps with an indifferent fixed point
For a map of the unit interval with an indifferent fixed point, we prove an
upper bound for the variance of all observables of variables
which are componentwise Lipschitz. The proof is based on
coupling and decay of correlation properties of the map. We then give various
applications of this inequality to the almost-sure central limit theorem, the
kernel density estimation, the empirical measure and the periodogram.Comment: 26 pages, submitte
A Grid of 3D Stellar Atmosphere Models of Solar Metallicity: I. General Properties, Granulation and Atmospheric Expansion
Present grids of stellar atmosphere models are the workhorses in interpreting
stellar observations, and determining their fundamental parameters. These
models rely on greatly simplified models of convection, however, lending less
predictive power to such models of late type stars.
We present a grid of improved and more reliable stellar atmosphere models of
late type stars, based on deep, 3D, convective, stellar atmosphere simulations.
This grid is to be used in general for interpreting observations, and improve
stellar and asteroseismic modeling.
We solve the Navier Stokes equations in 3D and concurrent with the radiative
transfer equation, for a range of atmospheric parameters, covering most of
stellar evolution with convection at the surface. We emphasize use of the best
available atomic physics for quantitative predictions and comparisons with
observations.
We present granulation size, convective expansion of the acoustic cavity,
asymptotic adiabat, as function of atmospheric parameters. These and other
results are also available in electronic form.Comment: 16 pages, 12 figures. Accepted for publication in ApJ, 201
When does brokerage matter? Citation impact of research teams in an emerging academic field
Through exposure to heterogeneous sources of knowledge, actors who broker between unconnected contacts are more likely to generate valuable output. We contribute to the theory of social capital of brokerage by considering the impact of field maturity. Using longitudinal data from the field of strategic management we find that the benefits of network brokerage are stronger during the early stages of field development and diminish as the field matures. The results of our study call for further research on the interplay between network structures and processes of field emergence
A numerical study of infinitely renormalizable area-preserving maps
It has been shown in (Gaidashev et al, 2010) and (Gaidashev et al, 2011) that
infinitely renormalizable area-preserving maps admit invariant Cantor sets with
a maximal Lyapunov exponent equal to zero. Furthermore, the dynamics on these
Cantor sets for any two infinitely renormalizable maps is conjugated by a
transformation that extends to a differentiable function whose derivative is
Holder continuous of exponent alpha>0.
In this paper we investigate numerically the specific value of alpha. We also
present numerical evidence that the normalized derivative cocycle with the base
dynamics in the Cantor set is ergodic. Finally, we compute renormalization
eigenvalues to a high accuracy to support a conjecture that the renormalization
spectrum is real
A Two-Parameter Recursion Formula For Scalar Field Theory
We present a two-parameter family of recursion formulas for scalar field
theory. The first parameter is the dimension . The second parameter
() allows one to continuously extrapolate between Wilson's approximate
recursion formula and the recursion formula of Dyson's hierarchical model. We
show numerically that at fixed , the critical exponent depends
continuously on . We suggest the use of the independence as a
guide to construct improved recursion formulas.Comment: 7 pages, uses Revtex, one Postcript figur
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