• Ejection-collision orbits in the symmetric collinear four–body problem 

      Álvarez Ramírez, Martha; Barrabés Vera, Esther; Medina, M.; Ollé Torner, Mercè (2019-06-15)
      Article
      Accés obert
      In this paper, we consider the collinear symmetric four-body problem, where four masses and a¿>¿0, are aligned in this order and move symmetrically about their center of mass. We introduce regularized variables to deal ...
    • Non-integrability of some few body problems in two degrees of freedom 

      Acosta Humánez, Primitivo Belén; Álvarez Ramírez, Martha; Delgado Fernández, Joaquín (2008-11-16)
      Article
      Accés obert
      The basic theory of Differential Galois and in particular Morales--Ramis theory is reviewed with focus in analyzing the non--integrability of various problems of few bodies in Celestial Mechanics. The main theoretical ...