Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-18
Astronomy and Astrophysics
Astrophysics
13 pages, 11 figures, accepted by Astron. Astrophys
Scientific paper
10.1051/0004-6361:20052657
Non-linear effects in the dynamical evolution of a shearing sheet made of stars are studied. First the implications of hitherto neglected non-linearities of the Boltzmann equation for the dynamical evolution of the shearing sheet are investigated. Using a formalism developed previously on the basis of the linearized Boltzmann equation it is demonstrated that the inclusion of the non-linear term leads to a feedback cycle for swing amplified density waves in the unbounded shearing sheet. Such a feedback is unique to star disks and is not known for gas disks. In order to present concrete examples of the non-linear feedback cycle a SCF code was developed and numerical simulations of the dynamical evolution of the shearing sheet are performed. The numerical results seem to confirm the theoretical predictions. The evolution of the shearing sheet resembles closely and might actually explain the recurrent spiral instabilities found in large-scale numerical simulations of the dynamical evolution of galactic disks.
Dettbarn Christian
Fuchs Bernard
Tsuchiya Takuya
No associations
LandOfFree
Density waves in the shearing sheet V. Feedback cycle for swing amplification by non-linear effects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Density waves in the shearing sheet V. Feedback cycle for swing amplification by non-linear effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Density waves in the shearing sheet V. Feedback cycle for swing amplification by non-linear effects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-119560