Volume 406, Number 1, July IV 2003
|Page(s)||1 - 5|
|Published online||17 November 2003|
Numerical tests of dynamical friction in gravitational inhomogeneous systems
Dipartimento di Matematica, Università Statale di Bergamo, via dei Caniana 2, 24129 Bergamo, Italy Feza Gürsey Institute, PO Box 6 Çengelköy, Istanbul, Turkey Bogaziçi University, Physics Department 80815 Bebek, Istanbul, Turkey
Corresponding author: email@example.com
Accepted: 10 April 2003
In this paper, I test by numerical simulations the results of Del Popolo & Gambera (1998), dealing with the extension of Chandrasekhar and Von Neumann's analysis of the statistics of the gravitational field to systems in which particles (e.g. stars, galaxies) are inhomogeneously distributed. The paper is an extension of that of Ahmad & Cohen ([CITE]), in which the authors tested some results of the stochastic theory of dynamical friction developed by Chandrasekhar & von Neumann ([CITE]) in the case of homogeneous gravitational systems. It is also a continuation of the work developed in Del Popolo ([CITE],b), which extended the results of Ahmad & Cohen ([CITE]), (dealing with the study of the probability distribution of the stochastic force in homogeneous gravitational systems) to inhomogeneous gravitational systems. Similarly to what was done by Ahmad & Cohen ([CITE]) in the case of homogeneous systems, I test, by means of the evolution of an inhomogeneous system of particles, that the theoretical rate of force fluctuation describes correctly the experimental one. I find that the stochastic force distribution obtained for the evolved system is in good agreement with the Del Popolo & Gambera ([CITE]) theory. Moreover, in an inhomogeneous background the friction force is actually enhanced relative to the homogeneous case.
Key words: stars: statistics / celestial mechanics / methods: numerical
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.