49 research outputs found
Current reservoirs in the simple exclusion process
We consider the symmetric simple exclusion process in the interval
with additional birth and death processes respectively on , , and
. The exclusion is speeded up by a factor , births and deaths
by a factor . Assuming propagation of chaos (a property proved in a
companion paper "Truncated correlations in the stirring process with births and
deaths") we prove convergence in the limit to the linear heat
equation with Dirichlet condition on the boundaries; the boundary conditions
however are not known a priori, they are obtained by solving a non linear
equation. The model simulates mass transport with current reservoirs at the
boundaries and the Fourier law is proved to hold
Passives and Se Constructions
In this chapter we discuss some of the main properties of constructions involving participial passives, passive se, and impersonal se in Portuguese, focusing on its two main varieties, European and Brazilian Portuguese (henceforth EP and BP, respectively).1 When the two dialects differ, we will provide the relevant judgments each dialect assigns to the data under discussion by using the abbreviations EP and BP.
The chapter is organized in five sections. Section 2 deals with participial passives, distinguishing between adjectival and verbal passives and between the participial forms of passives and compound tenses. Section 3 focuses on passive se and impersonal se constructions, comparing them with verbal passives when appropriate. Section 4 concludes the paper.info:eu-repo/semantics/publishedVersio
Multifractal properties of return time statistics
Fluctuations in the return time statistics of a dynamical system can be
described by a new spectrum of dimensions. Comparison with the usual
multifractal analysis of measures is presented, and difference between the two
corresponding sets of dimensions is established. Theoretical analysis and
numerical examples of dynamical systems in the class of Iterated Functions are
presented.Comment: 4 pages, 3 figure
Correlation decay and recurrence estimates for some robust nonuniformly hyperbolic maps
We study decay of correlations, the asymptotic distribution of hitting times
and fluctuations of the return times for a robust class of multidimensional
non-uniformly hyperbolic transformations. Oliveira and Viana [15] proved that
there is a unique equilibrium state for a large class of non- uniformly
expanding transformations and Holder continuous potentials with small
variation. For an open class of potentials with small variation, we prove
quasi-compactness of the Ruelle-Perron-Frobenius operator in a space
of functions with essential bounded variation that strictly contain Holder
continuous observables. We deduce that the equilibrium states have exponential
decay of correlations. Furthermore, we prove exponential asymptotic distribu-
tion of hitting times and log-normal fluctuations of the return times around
the average given by the metric entropy.Comment: 24 page