Noise, friction and the radial-orbit instability in anisotropic stellar systems: stochastic N-body simulations

TL;DR

This paper investigates how different types of noise influence the radial-orbit instability in anisotropic stellar systems through stochastic N-body simulations, revealing that noise effects vary with initial anisotropy levels.

Contribution

It introduces a detailed numerical analysis of noise effects on the radial-orbit instability, highlighting the differential impact of additive and multiplicative noise based on initial conditions.

Findings

Noise type affects instability onset differently

Additive noise delays or accelerates instability

Multiplicative noise has distinct effects depending on initial anisotropy

Abstract

By means of numerical simulations we study the radial-orbit instability in anisotropic self-gravitating $N-$body systems under the effect of noise. We find that the presence of additive or multiplicative noise has a different effect on the onset of the instability, depending on the initial value of the orbital anisotropy.