A new method to find the potential center of <i>N</i>-body systems
We present a new and fast method to nd the potential center of an <i>N</i>-body distribution. The method uses an iterative algorithm which exploits the fact that the gradient of the potential is null at its center: it uses a smoothing radius to avoid getting trapped in secondary minima....
Guardado en:
| Autores principales: | , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2002
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/93638 http://www.astrosmo.unam.mx/rmaa/RMxAA..38-2/PDF/RMxAA..38-2_cruz.pdf https://ri.conicet.gov.ar/handle/11336/36956 |
| Aporte de: |
| id |
I19-R120-10915-93638 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Astronomía globular clusters: general methods: N-body simulations, numerical |
| spellingShingle |
Astronomía globular clusters: general methods: N-body simulations, numerical Aguilar, L. A. Cruz, F. Carpintero, Daniel Diego A new method to find the potential center of <i>N</i>-body systems |
| topic_facet |
Astronomía globular clusters: general methods: N-body simulations, numerical |
| description |
We present a new and fast method to nd the potential center of an <i>N</i>-body distribution. The method uses an iterative algorithm which exploits the fact that the gradient of the potential is null at its center: it uses a smoothing radius to avoid getting trapped in secondary minima. We have tested this method on several random realizations of King models (in which the numerical computation of this center is rather dicult, due to the constant density within their cores), and compared its performance and accuracy against a more straightforward, but computer intensive method, based on cartesian meshes of increasing spatial resolution. In all cases, both methods converged to the same center, within the mesh resolution, but the new method is two orders of magnitude faster.
We have also tested the method with one astronomical problem: the evolution of a 10<sup>5</sup> particle King model orbiting around a xed potential that represents our Galaxy. We used a spherical harmonics expansion <i>N</i>-body code, in which the potential center determination is crucial for the correct force computation. We compared this simulation with another one in which a method previously used to determine the expansion center is employed (White 1983). Our routine gives better results in energy conservation and mass loss. |
| format |
Articulo Articulo |
| author |
Aguilar, L. A. Cruz, F. Carpintero, Daniel Diego |
| author_facet |
Aguilar, L. A. Cruz, F. Carpintero, Daniel Diego |
| author_sort |
Aguilar, L. A. |
| title |
A new method to find the potential center of <i>N</i>-body systems |
| title_short |
A new method to find the potential center of <i>N</i>-body systems |
| title_full |
A new method to find the potential center of <i>N</i>-body systems |
| title_fullStr |
A new method to find the potential center of <i>N</i>-body systems |
| title_full_unstemmed |
A new method to find the potential center of <i>N</i>-body systems |
| title_sort |
new method to find the potential center of <i>n</i>-body systems |
| publishDate |
2002 |
| url |
http://sedici.unlp.edu.ar/handle/10915/93638 http://www.astrosmo.unam.mx/rmaa/RMxAA..38-2/PDF/RMxAA..38-2_cruz.pdf https://ri.conicet.gov.ar/handle/11336/36956 |
| work_keys_str_mv |
AT aguilarla anewmethodtofindthepotentialcenterofinibodysystems AT cruzf anewmethodtofindthepotentialcenterofinibodysystems AT carpinterodanieldiego anewmethodtofindthepotentialcenterofinibodysystems AT aguilarla newmethodtofindthepotentialcenterofinibodysystems AT cruzf newmethodtofindthepotentialcenterofinibodysystems AT carpinterodanieldiego newmethodtofindthepotentialcenterofinibodysystems |
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Repositorios |
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1764820491539841026 |