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dc.contributor.authorLevin, Yanpt_BR
dc.contributor.authorPakter, Renatopt_BR
dc.contributor.authorRizzato, Felipe Barbedopt_BR
dc.date.accessioned2014-08-22T02:11:12Zpt_BR
dc.date.issued2008pt_BR
dc.identifier.issn1539-3755pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/101631pt_BR
dc.description.abstractTheory 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.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. E, Statistical, nonlinear and soft matter physics. Vol. 78, no. 2 (Aug. 2008), 021130 4p.pt_BR
dc.rightsOpen Accessen
dc.subjectFísica estatísticapt_BR
dc.subjectGravitacaopt_BR
dc.subjectGaláxiaspt_BR
dc.subjectEquações de estadopt_BR
dc.subjectSeparação de fasespt_BR
dc.titleCollisionless relaxation in gravitacional systems from violent relaxation to gravothermal collapsept_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000676825pt_BR
dc.type.originEstrangeiropt_BR


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