25 research outputs found
On the long time behavior of Hilbert space diffusion
Stochastic differential equations in Hilbert space as random nonlinear
modified Schroedinger equations have achieved great attention in recent years;
of particular interest is the long time behavior of their solutions. In this
note we discuss the long time behavior of the solutions of the stochastic
differential equation describing the time evolution of a free quantum particle
subject to spontaneous collapses in space. We explain why the problem is subtle
and report on a recent rigorous result, which asserts that any initial state
converges almost surely to a Gaussian state having a fixed spread both in
position and momentum.Comment: 6 pages, EPL2-Te
On a general kinetic equation for many-particle systems with interaction, fragmentation and coagulation
We deduce the most general kinetic equation that describe the low
density limit of general Feller processes for the systems of random
number of particles with interaction, collisions, fragmentation and coagulation. This is done by studying the limiting as ε -> 0 evolution
of Feller processes on ∪n∞ Xn with X = Rd or X = Zd described by the generators of the form ε-1 ∑K k=0 εkB(k), K ∈ N, where B(k) are
the generators of k-arnary interaction, whose general structure is also
described in the paper