Laboratory of Information Technologies

Seminar of the scientific department of computational physics

Date and Time: Tuesday, 28 September 2021, at 3:00 PM

Venue: Conference Hall, Laboratory of Information Technologies; online seminar on Webex

Report topic: “On the difference schemes for the many-body problem preserving all algebraic integrals”

Authors: Ali Baddour (Peoples’ Friendship University of Russia – RUDN University), M. D. Malykh (RUDN University, Meshcheryakov Laboratory of Information Technologies)

Speaker: M. D. Malykh

Abstract:

A new approach to the creation of difference schemes of any order for the many-body problem that preserve all its algebraic integrals is proposed. It is based on the combination of the two ideas: the method of energy quadratization and the rejection of inheritance symplectic structure. Results of the tests with the simplest scheme of this class are presented. A flat three-body problem with equal masses is selected for testing. The case when bodies pass close to each other is considered, for which purpose the algorithm of time step scaling near numerical singularities is specially developed. A comparison with the explicit Runge-Kutta method of the 4th order and the simplest simplectic method, the midpoint scheme, was made.

More information on the seminar and the link to connect are available on Indico.