Astronomisches Rechen-Institut Heidelberg

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Paper 1999099

Author(s): Spurzem, R.
Title: Direct N-body Simulations
Source: In: Riffert H., Werner K. (eds), Computational Astrophysics, The Journal of Computational and Applied Mathematics (JCAM) 109, 407 - 432
Year: 1999
Abstract: Special high-accuracy direct force summation N-body algorithms and their relevance for the simulation of the dynamical evolution of star clusters and other gravitating N-body systems in astrophysics are presented, explained and compared with other methods. Other methods means here approximate physical models based on the Fokker-Planck equation as well as other, approximate algorithms to compute the gravitational potential in N-body systems. Questions regarding the parallel implementation of direct ``brute force'' N-body codes are discussed. The astrophysical application of the models to the theory of relaxing rotating and non-rotating collisional star clusters is presented, briefly mentioning the questions of the validity of the Fokker-Planck approximation, the existence of gravothermal oscillations and of rotation and primordial binaries.
Preprint issued:
Remarks: Preprint No. 96

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