Abstract
view Abstract Citations (82) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Are Some N-Body Algorithms Intrinsically Less Collisional than Others? Hernquist, Lars ; Barnes, Joshua E. Abstract Empirical tests are used to measure relaxation rates in direct summation, hierarchical tree, and spherical harmonic N-body codes. We find that these methods suffer from comparable levels of relaxation for the same particle number and effective spatial resolution. This conclusion is counter to the wide-spread belief that expansion techniques are intrinsically less collisional than other methods. In fact, any algorithm which represents the density field using discrete particles will be subject to fluctuations in the potential, resulting in departures from the mean-field limit. Given appropriate resources, direct summation and hierarchical tree methods are valid approaches for simulating collisionless systems. The suitability of a given technique for studying collisionless processes is determined only by considerations of efficiency. Publication: The Astrophysical Journal Pub Date: February 1990 DOI: 10.1086/168343 Bibcode: 1990ApJ...349..562H Keywords: Astronomical Models; Many Body Problem; Stellar Motions; Algorithms; Computational Astrophysics; Astrophysics; NUMERICAL METHODS; STARS: STELLAR DYNAMICS full text sources ADS |
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