Collisionless relaxation in gravitacional systems from violent relaxation to gravothermal collapse
dc.contributor.author | Levin, Yan | pt_BR |
dc.contributor.author | Pakter, Renato | pt_BR |
dc.contributor.author | Rizzato, Felipe Barbedo | pt_BR |
dc.date.accessioned | 2014-08-22T02:11:12Z | pt_BR |
dc.date.issued | 2008 | pt_BR |
dc.identifier.issn | 1539-3755 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/101631 | pt_BR |
dc.description.abstract | Theory and simulations are used to study collisionless relaxation of a gravitational N-body system. It is shown that when the initial one-particle distribution function satisfies the virial condition—potential energy is minus twice the kinetic energy—the system quickly relaxes to a metastable state described quantitatively by the Lynden-Bell distribution with a cutoff. If the initial distribution function does not meet the virial requirement, the system undergoes violent oscillations, resulting in a partial evaporation of mass. The leftover particles phase-separate into a core-halo structure. The theory presented allows us to quantitatively predict the amount and the distribution of mass left in the central core, without any adjustable parameters. On a longer time scale TG~N, collisionless relaxation leads to a gravothermal collapse. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. E, Statistical, nonlinear and soft matter physics. Vol. 78, no. 2 (Aug. 2008), 021130 4p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Física estatística | pt_BR |
dc.subject | Gravitacao | pt_BR |
dc.subject | Galáxias | pt_BR |
dc.subject | Equações de estado | pt_BR |
dc.subject | Separação de fases | pt_BR |
dc.title | Collisionless relaxation in gravitacional systems from violent relaxation to gravothermal collapse | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000676825 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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