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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Celestial mechanics and dynamical astronomy 21 (1980), S. 25-36 
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the regularization by continuity w.r.t. initial conditions (geometric or Easton method) which has a sense both in physical and computational aspects. Using the idea of triple collision manifold of McGehee we study the values of masses for which the invariant manifolds of equilibrium points coincide. Local analytical equations are continuated numerically. So one gets the masses satisfying a necessary condition. Again analytically we discuss the neighbourhood of t.c.m. at the equilibrium points. A necessary and sufficient condition in terms of integrals along invariant manifolds is found for the rectilinear case. This can be tested for the masses obtained above. Only a countable (symmetric) set of masses remains. Then, due to errors in physical measurements or numerical integrations we can never expect a regular behaviour. Extension to the planar case is also taken into account.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Celestial mechanics and dynamical astronomy 18 (1978), S. 165-184 
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Beyond the casen=3 little was known about relative equilibrium solutions of then-body problem up to recent years. Palmore's work provides in the general case much useful information. In the casen=4 he gives the totality of solutions when the four masses are equal and studies some degeneracies. We present here a survey of solutions for arbitrary masses, discussing the manifolds of degeneracy. The ordering of restricted potentials allows a counting of the number of bifurcation sets and different invariant manifolds. An analysis of linear stability is done in the restricted and general cases. As a result, values of the masses ensuring linear stability are given.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Celestial mechanics and dynamical astronomy 28 (1982), S. 37-48 
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We complete Mc Gehee's picture of introducing a boundary (total collision) manifold to each energy surface. This is done by constructing the missing components of its boundary as other submanifolds. representing now the asymptotic behavior at infinity. It is necessary to treat each caseh=0,h〉0 orh〈0 separately. In the first case, we repeat the known result that the behavior at total escape is the same as in total collision. In particular, we explain why the situation is radically different in theh〉0 case compared with the zero energy case. In the caseh〈0 we have many infinity manifold components. and the general situation is not quite well understood. Finally, our results forh≥0 are shown to be valid for general homogeneous potentials.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Celestial mechanics and dynamical astronomy 28 (1982), S. 49-62 
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the trapezoidal problem of four bodies. This is a special problem where only three degrees of freedom are involved. The blow up method of McGehee can be used to deal with the quadruple collision. Two degenerate cases are studied in this paper: the rectangular and the collinear problems. They have only two degrees of freedom and the analysis of total collapse can be done in a way similar to the one used for the collinear and isosceles problems of three bodies. We fully analyze the flow on the total collision manifold, reducing the problem of finding heteroclinic connections to the study of a single ordinary differential equation. For the collinear case, from which arises a one parameter family of equations, the analysis for extreme values of the parameter is done and numerical computations fill up the gap for the intermediate values. Dynamical consequences for possible motions near total collision as well as for regularization are obtained.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Celestial mechanics and dynamical astronomy 55 (1993), S. 281-287 
    ISSN: 1572-9478
    Keywords: Non integrability ; second degree zonal harmonic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the motion of a massless particle around an oblate planet, keeping only in the expression of the perturbing potential the second degree zonal harmonic. We prove the analytical non integrability of this problem, by using Ziglin's theorem and the Yoshida criterion for homogeneous potentials.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 38 (1987), S. 10-20 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Wir betrachten die Topologie der Jacobi-Flächen im ebenen eingeschränkten 3-Körperproblem im Fall, daß das Massenverhältnisμ klein und die Jacobi-Konstante Null oder fast Null ist. Für diese Werte gibt es keine „zero velocity curves“, so daß es möglich ist, daß der dritte Körper aus dem Unendlichen kommt und mit den beiden andern kollidiert. Nach Regularisierung der Kollisionen und Hinzufügung eines 2-Torus im Unendlichen durch „blow-up“, kann gezeigt werden, daß die Jacobi-Fläche topologisch äquivalent zum orientierbaren [0,1]-Bündel über der „Klein bottle“ ist. Es werden Koordinaten definiert, so daß die Topologie diejenige des Würfels mit geeigneter Identifikation von Seiten ist. Andere Koordinaten, die der Physik des Problems besser angepaßt sind, erlauben eine detailliertere Beschreibung „im Unendlichen“, wo hyperbolische oder parabolische Bahnen die ins Unendliche entweichen oder daher kommen asymptotisch zu periodischen Lösungen auf dem Torus im Unendlichen sind.
    Notes: Abstract We consider the topological description of the Jacobi levels in the circular planar restricted 3-body problem, when the mass parameterμ is close to zero and the Jacobi constant is zero or close to zero. For these values of the constant there are no zero velocity curves, so that it is possible that the infinitesimal body comes from infinity and has collisions with the other 2 bodies. After regularization of such collisions and addition of a 2-torus at infinity through blow up, we show that the Jacobi level is topologically equivalent to the unique orientable [0, 1]-bundle over the Klein bottle. Then we find coordinates making explicit this topology as a cube where some of the faces are identified. More physical coordinates at infinity give a better description, where hyperbolic or parabolic orbits escaping to (or coming from) infinity are asymptotic to periodic orbits on the torus at infinity.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archive for rational mechanics and analysis 77 (1981), S. 189-198 
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Homothetic solutions of the n-body problem can be seen as heteroclinic orbits when the dynamical variables are changed via the McGehee blow-up and the time is suitably scaled. Transversality of the invariant asymptotic manifolds which contain the heteroclinic orbits is related to some structural stability. We fully characterize the cases in which such transversality is obtained for the n-body problem in any dimension.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 21 (1979), S. 465-494 
    ISSN: 1572-9613
    Keywords: Hénon-Pomeau attractor ; evolution of strange attractors ; Hausdorff dimension ; Lyapunov numbers ; numerical experiments ; homoclinic and heteroclinic points
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The behavior of the iterates of the mapT(x, y) = (1+y−ax 2,bx) can be useful for the understanding of turbulence. In this study we fix the value ofb at 0.3 and allowa to take values in a certain range. We begin with the study of the casea=1.4, for which we determine the existence of a strange attractor, whose region of attraction and Hausdorff dimension are obtained. As we changea, we study numerically the existence of periodic orbits (POs) and strange attractors (SAs), and the way in which they evolve and bifurcate, including the computation of the associated Lyapunov numbers. Several mechanisms are proposed to explain the creation and disappearance of SAs, the basin of attraction of POs, and the cascades of bifurcations of POs and of SAs for increasing and decreasing values ofa. The role of homoclinic and heteroclinic points is stressed.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 248 (1980), S. 153-184 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of the Brazilian Mathematical Society 29 (1998), S. 253-293 
    ISSN: 1678-7714
    Keywords: Schrödinger equation with quasi-periodic potential ; (non-) reducibility to Floquet form ; quasiperiodic resonance tongues and unstability pockets ; positive Lyapunov exponent ; collapse of resonance tongues and breakdown of tori
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A simple example is considered of Hill's equation $$\ddot x + (a^2 + bp(t))x = 0$$ , where the forcing termp, instead of periodic, is quasi-periodic with two frequencies. A geometric exploration is carried out of certain resonance tongues, containing instability pockets. This phenomenon in the perturbative case of small |b|, can be explained by averaging. Next a numerical exploration is given for the global case of arbitraryb, where some interesting phenomena occur. Regarding these, a detailed numerical investigation and tentative explanations are presented.
    Type of Medium: Electronic Resource
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