18,359 research outputs found
Stochastic quasi-geostrophic equation
In this note we study the 2d stochastic quasi-geostrophic equation in
for general parameter and multiplicative
noise. We prove the existence of martingale solutions and pathwise uniqueness
under some condition in the general case, i.e. for all . In
the subcritical case , we prove existence and uniqueness of
(probabilistically) strong solutions and construct a Markov family of
solutions. In particular, it is uniquely ergodic for provided the
noise is non-degenerate. In this case, the convergence to the (unique)
invariant measure is exponentially fast. In the general case, we prove the
existence of Markov selections
A note on stochastic semilinear equations and their associated Fokker-Planck equations
In this paper we treat semilinear stochastic partial differential equations
by two methods. First, we extend the framework of [BDR10] from a Hilbert space
to a Gelfand triple and as an application we prove the existence of solutions
for the Fokker-Planck equations associated to semilinear equations with
space-time white noise and both with polynomially growing nonlinearities and
Burgers type nonlinearities at the same time. Second we adopt the approximation
technique from [BDR10] to obtain existence of unique strong solutions to
semilinear stochastic partial differential equations driven by space-time white
noise, generalizing corresponding known results from the literature.Comment: To appear in Journal of Mathematical Analysis and Application
Sub and supercritical stochastic quasi-geostrophic equation
In this paper, we study the 2D stochastic quasi-geostrophic equation on
for general parameter and multiplicative noise.
We prove the existence of weak solutions and Markov selections for
multiplicative noise for all . In the subcritical case
, we prove existence and uniqueness of (probabilistically) strong
solutions. Moreover, we prove ergodicity for the solution of the stochastic
quasi-geostrophic equations in the subcritical case driven by possibly
degenerate noise. The law of large numbers for the solution of the stochastic
quasi-geostrophic equations in the subcritical case is also established. In the
case of nondegenerate noise and in addition exponential ergodicity
is proved.Comment: Published at http://dx.doi.org/10.1214/13-AOP887 in the Annals of
Probability (http://www.imstat.org/aop/) by the Institute of Mathematical
Statistics (http://www.imstat.org
Asymmetric Compute-and-Forward with CSIT
We present a modified compute-and-forward scheme which utilizes Channel State
Information at the Transmitters (CSIT) in a natural way. The modified scheme
allows different users to have different coding rates, and use CSIT to achieve
larger rate region. This idea is applicable to all systems which use the
compute-and-forward technique and can be arbitrarily better than the regular
scheme in some settings.Comment: in International Zurich Seminar on Communications, 2014; minor update
on example
- …