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A density-functional theory is established for inhomogeneous superfluids at finite temperature, subject to time-dependent external fields in isothermal conditions. After outlining parallelisms between a neutral superfluid and a charged…

统计力学 · 物理学 2009-10-31 M. L. Chiofalo , M. P. Tosi

Using Girsanov transformations we construct from sticky reflected Brownian motion on $[0,\infty)$ a conservative diffusion on $E:=[0,\infty)^n$, $n \in \mathbb{N}$, and prove that its transition semigroup possesses the strong Feller…

概率论 · 数学 2016-12-12 Martin Grothaus , Robert Voßhall

In this paper, we show the weak and strong well-posedness of density dependent stochastic differential equations driven by $\alpha$-stable processes with $\alpha \in(1,2)$. The existence part is based on Euler's approximation as…

概率论 · 数学 2021-12-14 Mingyan Wu , Zimo Hao

We consider driftless stochastic differential equations and the diffusions starting from the positive half line. It is shown that the Feller test for explosions gives a necessary and sufficient condition to hold pathwise uniqueness for…

概率论 · 数学 2016-12-21 Hiroya Hashimoto , Takahiro Tsuchiya

We present a derivation of a stochastic model of Navier Stokes equations that relies on a decomposition of the velocity fields into a differentiable drift component and a time uncorrelated uncertainty random term. This type of decomposition…

流体动力学 · 物理学 2015-06-15 Etienne Mémin

Let M be a compact connected oriented Riemannian manifold. The purpose of this paper is to investigate the long time behavior of a degenerate stochastic differential equation on the state space $M\times \mathbb{R}^{n}$; which is obtained…

概率论 · 数学 2016-04-28 Michel Benaïm , Carl-Erik Gauthier

In this paper, we first show the well-posedness of the SDEs driven by L\'{e}vy noises under mild conditions. Then, we consider the existence and uniqueness of periodic solutions of the SDEs. To establish the ergodicity and uniqueness of…

概率论 · 数学 2019-06-20 Xiao-Xia Guo , Wei Sun

We study the problem of estimating the coefficients of a diffusion (X_t,t\geq 0); the estimation is based on discrete data X_{n\Delta},n=0,1,...,N. The sampling frequency \Delta^{-1} is constant, and asymptotics are taken as the number N of…

统计理论 · 数学 2007-06-13 Emmanuel Gobet , Marc Hoffmann , Markus Reiss

Stationary flows of an inviscid and incompressible fluid of constant density in the region $D=(0, L)\times \mathbb R^2$, periodic in the second and third variables, are considered. The flux and the Bernoulli function are prescribed at each…

偏微分方程分析 · 数学 2025-05-06 Boris Buffoni , Eric Séré

This paper is concerned with the It\^o stochastic differential equations with $\mR^{d\times k}$ diffusions in class of H\"older spaces and continuous $\mR^d$ drifts. We derive a uniqueness result of strong solutions for $\cC^\alpha \…

偏微分方程分析 · 数学 2025-07-21 Rongrong Tian , Shuheng Tu , Jinlong Wei

We prove Sobolev regularity for distributional solutions to the Dirichlet problem for generators of $2s$-stable processes and exterior data, inhomogeneity in weighted $L^2$-spaces. This class of operators includes the fractional Laplacian.…

偏微分方程分析 · 数学 2023-07-31 Florian Grube , Thorben Hensiek , Waldemar Schefer

We consider a $d$-dimensional SDE with an identity diffusion matrix and a drift vector being a vector function of bounded variation. We give a representation for the derivative of the solution with respect to the initial data.

概率论 · 数学 2016-05-24 Olga Aryasova , Andrey Pilipenko

The (strong and weak) well-posedness is proved for singular SDEs depending on the distribution density point-wisely and globally, where the drift satisfies a local integrability condition in time-spatial variables, and is Lipschitz…

概率论 · 数学 2023-09-11 Feng-Yu Wang

Through a discussion of some typical unsteady hydrodynamic flows, we argue that the time averaged hydrodynamic functions at each point give a rather sparse filling of the local jet space. This situation then suggests a set of time dependent…

流体动力学 · 物理学 2014-07-08 Clifford Chafin

We study the non-stationary Feller process with time varying coefficients. We obtain the exact probability distribution exemplified by its characteristic function and cumulants. In some particular cases we exactly invert the distribution…

统计力学 · 物理学 2016-02-17 Jaume Masoliver

The strong convergence of Euler approximations of stochastic delay differential equations is proved under general conditions. The assumptions on drift and diffusion coefficients have been relaxed to include polynomial growth and only…

概率论 · 数学 2013-03-07 Chaman Kumar , Sotirios Sabanis

We establish the existence and pathwise uniqueness of regime-switching diffusion processes in an infinite state space, which could be time-inhomogeneous and state-dependent. Then the strong Feller properties of these processes are…

概率论 · 数学 2015-07-30 Jinghai Shao

We consider stochastic differential equations on $\mathbb R^d$ with coefficients depending on the path and distribution for the whole history. Under a local integrability condition on the time-spatial singular drift, the well-posedness and…

概率论 · 数学 2025-07-15 Feng-Yu Wang , Chenggui Yuan , Xiao-Yu Zhao

This paper proves a Krylov-Safonov estimate for a multidimensional diffusion process whose diffusion coefficients are degenerate on the boundary. As applications the existence and uniqueness of invariant probability measures for the process…

概率论 · 数学 2019-06-04 Fu Zhang , Kai Du

We set out some general criteria to prove the K-property, refining the assumptions used in arXiv:1906.09315 for the flow case, and introducing the analogous discrete-time result. We also introduce one-sided $\lambda$-decompositions, as well…

动力系统 · 数学 2020-07-02 Benjamin Call