PUBLICATIONS OF THE ASTRONOMICAL OBSERVATORY OF BELGRADE104, Page 159-167, https://doi.org/10.69646/aob104p159
PROCEEDINGS of the XX Serbian Astronomical Conference, Belgrade, October 16 - 20, 2023, Edited by Jelena Petrović, Dušan Marčeta and Ana Lalović
Published by: Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia

Abstract. Theory of accretion disk is subject of several different theoretical models. Here, we list all important effects that can influence the accretion disk dynamics. For each effect, we propose nonlinear solution that is able to overcome linearly unstable structure. Such a stable, long lasting structure is useful in many aspects, but the most important one is possibility to compare to observed parameters relevant for the existence of the nonlinear solution.