Noise-Enhanced Parametric Resonance in Perturbed Galaxies
Abstract
This paper describes how parametric resonances associated with a galactic potential subjected to relatively low amplitude, strictly periodic time-dependent perturbations can be impacted by pseudo-random variations in the pulsation frequency, modeled as coloured noise. One aim thereby is to allow for the effects of a changing oscillation frequency as the density distribution associated with a galaxy evolves during violent relaxation. Another is to mimic the possible effects of internal substructures, satellite galaxies, and or a high density environment. The principal conclusion is that allowing for a variable frequency does not vitiate the effects of parametric resonance; and that, in at least some cases, such variations can increase the overall importance of parametric resonance associated with systematic pulsations.
Cite
@article{arxiv.astro-ph/0308481,
title = {Noise-Enhanced Parametric Resonance in Perturbed Galaxies},
author = {Ioannis V. Sideris and Henry E. Kandrup},
journal= {arXiv preprint arXiv:astro-ph/0308481},
year = {2009}
}
Comments
9 pages, inclduing 8 figures