1,549 research outputs found
Large deviations for a random speed particle
We investigate large deviations for the empirical measure of the position and
momentum of a particle traveling in a box with hot walls. The particle travels
with uniform speed from left to right, until it hits the right boundary. Then
it is absorbed and re-emitted from the left boundary with a new random speed,
taken from an i.i.d. sequence. It turns out that this simple model, often used
to simulate a heat bath, displays unusually complex large deviations features,
that we explain in detail. In particular, if the tail of the update
distribution of the speed is sufficiently oscillating, then the empirical
measure does not satisfy a large deviations principle, and we exhibit optimal
lower and upper large deviations functionals
A large deviation principle for empirical measures on Polish spaces: Application to singular Gibbs measures on manifolds
We prove a large deviation principle for a sequence of point processes
defined by Gibbs probability measures on a Polish space. This is obtained as a
consequence of a more general Laplace principle for the non-normalized Gibbs
measures. We consider three main applications: Conditional Gibbs measures on
compact spaces, Coulomb gases on compact Riemannian manifolds and the usual
Gibbs measures in the Euclidean space. Finally, we study the generalization of
Fekete points and prove a deterministic version of the Laplace principle known
as -convergence. The approach is partly inspired by the works of Dupuis
and co-authors. It is remarkably natural and general compared to the usual
strategies for singular Gibbs measures.Comment: 23 pages, abstract also in french, for more details in the proofs see
version 1, application to Gaussian polynomials adde
Large deviations for random walks in a random environment on a strip
We consider a random walk in a random environment (RWRE) on the strip of
finite width . We prove both quenched and
averaged large deviation principles for the position and the hitting times of
the RWRE. Moreover, we prove a variational formula that relates the quenched
and averaged rate functions, thus extending a result of Comets, Gantert, and
Zeitouni for nearest-neighbor RWRE on $\mathbb{Z}
A Renewal version of the Sanov theorem
Large deviations for the local time of a process are investigated,
where for and are i.i.d.\ random
variables on a Polish space, is the -th arrival time of a renewal
process depending on . No moment conditions are assumed on the arrival
times of the renewal process.Comment: 13 page
A large deviation approach to optimal transport
A probabilistic method for solving the Monge-Kantorovich mass transport
problem on is introduced. A system of empirical measures of independent
particles is built in such a way that it obeys a doubly indexed large deviation
principle with an optimal transport cost as its rate function. As a
consequence, new approximation results for the optimal cost function and the
optimal transport plans are derived. They follow from the Gamma-convergence of
a sequence of normalized relative entropies toward the optimal transport cost.
A wide class of cost functions including the standard power cost functions
enter this framework
Process-level quenched large deviations for random walk in random environment
We consider a bounded step size random walk in an ergodic random environment
with some ellipticity, on an integer lattice of arbitrary dimension. We prove a
level 3 large deviation principle, under almost every environment, with rate
function related to a relative entropy.Comment: Proof of (6.2) corrected. Lemma A.2 replace
Large Deviations and Fluctuation Theorem for Selectively Decoupled Measures on Shift Spaces
We establish the Level-1 and Level-3 Large Deviation Principles (LDPs) for
invariant measures on shift spaces over finite alphabets under very general
decoupling conditions for which the thermodynamic formalism does not apply.
Such decoupling conditions arise naturally in multifractal analysis, in Gibbs
states with hard-core interactions, and in the statistics of repeated quantum
measurement processes. We also prove the LDP for the entropy production of
pairs of such measures and derive the related Fluctuation Relation. The proofs
are based on Ruelle-Lanford functions, and the exposition is essentially
self-contained
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