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
|