Trapezoid central configurations
Corbera Subirana, Montserrat (Universitat de Vic. Departament d'Enginyeries)
Cors Iglesias, Josep Maria (Universitat Politècnica de Catalunya. Departament de Matemàtiques)
Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
Pérez-Chavela, Ernesto (UAM-Iztapalapa(México). Departamento de Matemáticas)

Date:	2019
Abstract:	We classify all planar four-body central configurations where two pairs of the bodies are on parallel lines. Using cartesian coordinates, we show that the set of four-body trapezoid central configurations with positive masses forms a two-dimensional surface where two symmetric families, the rhombus and isosceles trapezoid, are on its boundary. We also prove that, for a given position of the bodies, in some cases a specific order of the masses determines the geometry of the configuration, namely acute or obtuse trapezoid central configuration. We also prove the existence of non-symmetric trapezoid central configurations with two pairs of equal masses.
Grants:	Ministerio de Economía y Competitividad MTM2016-77278-P European Commission 777911 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-568
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	4-body problem ; Convex central configurations ; Trapezoidal central configurartions
Published in:	Applied Mathematics and Computation, Vol. 346 (April 2019) , p. 127-142, ISSN 0096-3003

DOI: 10.1016/j.amc.2018.10.066

Postprint 31 p, 10.1 MB

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