172 research outputs found
On the Poisson equation and diffusion approximation 3
We study the Poisson equation Lu+f=0 in R^d, where L is the infinitesimal
generator of a diffusion process. In this paper, we allow the second-order part
of the generator L to be degenerate, provided a local condition of Doeblin type
is satisfied, so that, if we also assume a condition on the drift which implies
recurrence, the diffusion process is ergodic. The equation is understood in a
weak sense. Our results are then applied to diffusion approximation.Comment: Published at http://dx.doi.org/10.1214/009117905000000062 in the
Annals of Probability (http://www.imstat.org/aop/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Sub-exponential mixing rate for a class of Markov chains
We establish sub-exponential bounds for the β-mixing rate
and for the rate of convergence to invariant measures for discrete
time Markov processes under recurrence type conditions weaker
than used for exponential inequalities and stronger than for
polynomial ones
On improved convergence conditions and bounds for Markov chains
Improved rates of convergence for ergodic Markov chains and relaxed
conditions for them, as well as analogous convergence results for
non-homogeneous Markov chains are studied. The setting from the previous works
is extended. Examples are provided where the new bounds are better and where
they give the same convergence rate as in the classical Markov -- Dobrushin
inequality.Comment: 33 pages, 27 reference
The Divine Clockwork: Bohr's correspondence principle and Nelson's stochastic mechanics for the atomic elliptic state
We consider the Bohr correspondence limit of the Schrodinger wave function
for an atomic elliptic state. We analyse this limit in the context of Nelson's
stochastic mechanics, exposing an underlying deterministic dynamical system in
which trajectories converge to Keplerian motion on an ellipse. This solves the
long standing problem of obtaining Kepler's laws of planetary motion in a
quantum mechanical setting. In this quantum mechanical setting, local mild
instabilities occur in the Kelperian orbit for eccentricities greater than
1/\sqrt{2} which do not occur classically.Comment: 42 pages, 18 figures, with typos corrected, updated abstract and
updated section 6.
Centers of crystallization in antimony thin films studied by transnission electron microscopy
We performed TEM studies of 7 crystallization centers using specially evaporated Sb thin films in finite areas. Strong internal lattice bending is revealed by use of the bend contour method.Partial support of project 3.6121.2017/8.9 (RF Ministry of Education and Science) and agreement № 02.A03.21.0006 (Act 211 Government of the RF) is acknowledged
Transitions between "" and "0" states in superconductor -- ferromagnet -- superconductor junctions
Experimental and theoretical study of superconductor (S) -- ferromagnet (F)
-- superconductor junctions showed that in certain range of parameters (e.g.,
the length of the ferromagnet , the exchange field, ) the
ground state of a SFS junction corresponds to superconducting phase difference
or 0. The phase diagram of a SFS junction with the respect to and 0
states is investigated in this letter in space. It is
shown that the phase diagram is very sensitive to the geometry of the system,
in particular, to the amount of disorder.Comment: Minor changes. References adde
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