Results 61 to 70 of about 42,716 (206)

Validation of VERB‐3D Simulation Results in Response to the COSPAR ISWAT Challenge

Space Weather, Volume 24, Issue 5, May 2026.
Abstract In response to the first long‐term simulation challenge issued by the COSPAR International Space Weather Action Team (ISWAT) G3‐04 team (“Internal Charging Effects and the Relevant Space Environment”), we evaluate the performance of the Versatile Electron Radiation Belt‐3D model by simulating the radiation belt electron dynamics for the entire
Xingzhi Lyu, Dedong Wang, Miroslav Hanzelka, Shangchun Teng, Alexander Y. Drozdov, Angelica Castillo, Yuri Y. Shprits   +6 more
wiley   +1 more source

The quantum Fokker-Planck equation of stochastic inflation

Journal of High Energy Physics, 2017
We derive the stochastic description of a massless, interacting scalar field in de Sitter space directly from the quantum theory. This is done by showing that the density matrix for the effective theory of the long wavelength fluctuations of the field ...
Hael Collins, Richard Holman, Tereza Vardanyan   +2 more
doaj   +1 more source

Diffusion in Phase Space as a Tool to Assess Variability of Vertical Centre-of-Mass Motion during Long-Range Walking

Physics, 2023
When a Hamiltonian system undergoes a stochastic, time-dependent anharmonic perturbation, the values of its adiabatic invariants as a function of time follow a distribution whose shape obeys a Fokker–Planck equation.
Nicolas Boulanger, Fabien Buisseret, Victor Dehouck, Frédéric Dierick, Olivier White   +4 more
doaj   +1 more source

Numerical self-consistent stellar models of thin disks

, 2005
We find a numerical self-consistent stellar model by finding the distribution function of a thin disk that satisfies simultaneously the Fokker-Planck and Poisson equations.
Aarseth, Ashurov, Cohn, de Zeeuw, de Zeeuw, Eddington, Freeman, Hunter, Jeans, Joshi, Kalnajs, King, Kuzmin, Letelier, M. Ujevic, Mestel, Michie, Michie, Miller, Miller, Miyamoto, Ng, Nishida, P. S. Letelier, Plummer, Rosenbluth, Schwarzschild, Statler, Stone, Takahashi, Takahashi, Teuben, Theuns, Toomre, Ujevic, van Albada, van de Ven, Vandervoort, Vogt, Watanabe, Wilkinson, Yepes   +41 more
core   +1 more source

Emergence of Network Structure in Models of Collective Evolution and Evolutionary Dynamics [PDF]

, 2007
We consider an evolving network of a fixed number of nodes. The allocation of edges is a dynamical stochastic process inspired by biological reproduction dynamics, namely by deleting and duplicating existing nodes and their edges.
Jensen, Henrik Jeldtot
core   +4 more sources

A Fully Connected Neural Network for Fast Estimation of Quasi‐Linear Diffusion Coefficients

Space Weather, Volume 24, Issue 5, May 2026.
Abstract Wave–particle interactions are a fundamental driver of electron radiation belt dynamics. Quantifying their effects through quasi‐linear theory requires diffusion coefficients, but their direct evaluation involves nested integrations and is computationally expensive, limiting their use in real‐time applications.
Mengli Tan, Yifan Wu, Zeyu An, Peng Peng, Xin Tao   +4 more
wiley   +1 more source

A unified approach for the solution of the Fokker-Planck equation

, 2000
This paper explores the use of a discrete singular convolution algorithm as a unified approach for numerical integration of the Fokker-Planck equation. The unified features of the discrete singular convolution algorithm are discussed.
(Qian L W, Brennan M J, Brey J J, Canuto C, Caroli B, Chang J S, Cox J C, Dahmen W, Dow J O, Ermak D L, Finlayson B A, Fornberg B, Forsythe G E, G W Wei, Hongler M O, Indira R, Jawerth B, Kadanoff L P, Kho T H, Kometani K, Kwok Y K, Larson E W, Muñoz M A, Qian L W, Risken H, Schult R L, Shizgal B, Suzuki M, Tian Y, Wei G W, Wong E   +30 more
core   +2 more sources

Global Effects of Chorus and Hiss Waves on Trapped Energetic Electrons at Jupiter

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract Unlike Earth, where whistler‐mode chorus is generally observed outside the plasmasphere and hiss is predominantly confined within it, Jupiter's magnetosphere frequently hosts both wave modes simultaneously. Using Juno observations, we present a global survey of whistler‐mode waves at Jupiter, demonstrating that both chorus and hiss are ...
W. Li, Q. Ma, W. S. Kurth, G. B. Hospodarsky, S. J. Bolton   +4 more
wiley   +1 more source

A Dissipation of Relative Entropy by Diffusion Flows

Entropy, 2016
Given a probability measure, we consider the diffusion flows of probability measures associated with the partial differential equation (PDE) of Fokker–Planck. Our flows of the probability measures are defined as the solution of the Fokker–Planck equation
Hiroaki Yoshida
doaj   +1 more source

Fractional Fokker-Planck Equation for Fractal Media

, 2006
We consider the fractional generalizations of equation that defines the medium mass. We prove that the fractional integrals can be used to describe the media with noninteger mass dimensions.
Forster D., Isihara A., Kolmogorov A. N., Levy P. P., Mandelbrot B., Resibois P., Samko S. G., Samko S. G., Schroeder M., Tarasov V. E., Tarasov V. E., Vasily E. Tarasov, Zaslavsky G. M.   +12 more
core   +1 more source