Vector resonant relaxation and statistical closure theory: Direct interaction approximation
Year: 2025
Type: article
Abstract: Stars orbiting a supermassive black hole in the center of galaxies undergo very efficient diffusion in their orbital orientations: this is "Vector Resonant Relaxation." Such a dynamics is intrinsically nonlinear, stochastic, and correlated, hence bearing deep similarities with turbulence in fluid mechanics or plasma physics. In that context, we show how generic methods stemming from statistical closure theory, namely, the celebrated "Martin-Siggia-Rose formalism," can be used to characterize the correlations describing the redistribution of orbital orientations. In particular, limiting ourselves to the leading order truncation in this closure scheme, the so-called "direct interaction approximation," and placing ourselves in the limit of an isotropic distribution of orientations, we explicitly compare the associated prediction for the two-point correlation function with measures from numerical simulations. We discuss the successes and limitations of this approach and present possible future venues.
Source: Physical review. E
Authors: Sofia Flores, Jean-Baptiste Fouvry
Institution: Institut d'Astrophysique de Paris
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4409292722