| セミナー: | CPS セミナー |
| 日時: | 2020 年 1月 20 日(月) 13:00 - |
| 場所: | 神戸大学惑星科学研究センター セミナー室 |
| 講演者: | HERNANDEZ David （MPC Fellow and ITC Fellow, Harvard-Smithsonian Center for Astrophysics） |
| タイトル: | Are long-term N-body simulations reliable? |
| 要旨: | Astrophysicists rely on solution for the N-body problem for a myriad of dynamics problems, from those in dark matter dynamics to those in planetary dynamics. Over 50 years ago, Miller found that errors in our simulations of the N-body problem grow exponentially in time. So why should one trust any such simulation over long times? In this talk, I explore a two-planet planetary system. The allowed motion over long times can be estimated by recent results from Hadden & Lithwich (2018). I find conventional integration methods are as accurate as fancier symplectic methods. In fact, a higher order symplectic method gave wrong statistics. |
| キーワード: | Integration; Long-term behavior |
| 世話人: | 牧野 淳一郎 |