Algorithmic regularization with velocity-dependent forces

Details Algorithmic regularization with velocity-dependent forces Algorithmic regularization with velocity-dependent forces

2006-05-02

arxiv.org/abs/astro-ph/0605054v1

Mon.Not.Roy.Astron.Soc.372:219-223,2006

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. Uses mn2e.cls

Scientific paper

10.1111/j.1365-2966.2006.10854.x

Algorithmic regularization uses a transformation of the equations of motion such that the leapfrog algorithm produces exact trajectories for two-body motion as well as regular results in numerical integration of the motion of strongly interacting few-body systems. That algorithm alone is not sufficiently accurate and one must use the extrapolation method for improved precision. This requires that the basic leapfrog algorithm be time-symmetric, which is not directly possible in the case of velocity-dependent forces, but is usually obtained with the help of the implicit midpoint method. Here we suggest an alternative explicit algorithmic regularization algorithm which can handle velocity-dependent forces. This is done with the help of a generalized midpoint method to obtain the required time symmetry, thus eliminating the need for the implicit midpoint method and allowing the use of extrapolation.

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