# On the long time energy conservation by high order geometric integrators

## Abstract

The main aim of this paper is to investigate the long-time behavior of three high order geometric integrators, namely an implicit Runge-Kutta-Gauss method, the composed Störmer-Verlet method and a high order linear multistep method. All these three families of methods perform fairly accurate, at least qualitatively, when they are used in the integration of the outer Solar system. No spiral outwards or inwards are observed when their orders exceed six. With the long time energy conservation the situation change considerable. A significant improving in the computation of Hamiltonian is observed passing from order two to six but further, in contrast with the trajectories, almost nothing is gain by increasing the order of the method. A partial answer to this intriguing situation is furnished by the analysis of round off errors.

C.I. Gheorghiu
A.C. Muresan

## Keywords

N-body problem; outer Solar system; composed geometric integrator; round-off errors; compensated summation; long time; energy conservation;

### References

See the expanding block below.

## Cite this paper as

C.I. Gheorghiu, A.C. Mureşan, On the long time energy conservation by high order geometric integrators, PADEU, 19 (2007), 213-219.

## PDF

?

##### Journal
Publication name

Publications of the Astronomy Department of the Eötvös University (PADEU), vol. 19 (2007), pp. 213-219.

##### Publisher Name

Cluj University Press
(Presa Universitara Clujeana)

##### Conference name

International Conference on Actual Problems in Celestial Mechanics and Dynamical Astronomy,
Cluj-Napoca, Romania, May 25-27, 2006

Editors:
B. Erdi and F. Szenkovits

##### Print ISSN

978-973-610-555-5

##### Google Scholar Profile

aici se introduce link spre google scholar