On Collisional Relaxation in Star Systems

Details On Collisional Relaxation in Star Systems On Collisional Relaxation in Star Systems

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010vsgh.conf..145o&link_type=abstract

Variable Stars, the Galactic halo and Galaxy Formation, Proceedings of an international conference held in Zvenigorod, Russia, 1

Astronomy and Astrophysics

Astronomy

Scientific paper

We reconsider effective relaxation time &tau__e (an e-folding divergence time) for steady gravitational systems following Gurzadyan-Savvidy's paradigm. It is shown that if the Holtsmark distribution for a random force truncated at 4Gm/σ^2 is adopted, τ_e/τ_c does not depend on N, τ_c being a crossing time. Probably this means that the Holtsmark distribution is not valid for such encounters. When Petrovskaya's distribution for a force due to close encounters is added, the ratio τ_e/τ_c depends on N and increases as N^{1/3}, in agreement with I. L. Genkin.

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