By Kenneth R. Meyer

The N-body challenge is the classical prototype of a Hamiltonian process with a wide symmetry crew and plenty of first integrals. those lecture notes are an advent to the idea of periodic options of such Hamiltonian structures. From a conventional standpoint the N-body challenge is very degenerate. it truly is invariant below the symmetry workforce of Euclidean motions and admits linear momentum, angular momentum and effort as integrals. accordingly, the integrals and symmetries has to be faced head on, which results in the definition of the diminished house the place all of the recognized integrals and symmetries were eradicated. it really is at the decreased house that it is easy to desire for a nonsingular Jacobian with no implementing additional symmetries. those lecture notes are meant for graduate scholars and researchers in arithmetic or celestial mechanics with a few wisdom of the idea of ODE or dynamical procedure thought. the 1st six chapters develops the speculation of Hamiltonian platforms, symplectic modifications and coordinates, periodic recommendations and their multipliers, symplectic scaling, the decreased house and so forth. the remainder six chapters comprise theorems which identify the life of periodic suggestions of the N-body challenge at the decreased space.

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**Example text**

Since K is at least third order at the origin, there is a constant C such that I c - 2 K ( E Z ) [< Cc for Z in a neighborhood of the origin and c small, which is written c - 2 K ( e Z ) = O(c). The equations of motion become 2 = A Z + O(E), A = JS. 10 Problems 37 If []ZII is about 1 and r is small, then z is small: thus the above transformation is useful in studying the equations near the critical point. To the lowest order in e the equations are linear, so close to the critical point, the linear terms are the most important terms.

Q N , P l , . . , P N 9 An equilibrium solution qi = a i , p i = bi of the N - b o d y problem in rotating coordinates is called a relative equilibrium and must satisfy N bi + coJai O, coJbi + mi E j=l,jr mimj(aj - ai) for i = 1 , . . , N , Ilaj -- aill 3 and so the ai's must satisfy N --c~ = E j=l ,jr mimj(aj - ai) for i = 1 . . , N. 5) with A = co2. Thus a planar central configuration gives rise to a relative equilibrium. The eigenvalues of the linearization of the equations of motion about a relative equilibrium are called the exponents of the relative equilibrium and 42 4.

One focus is at the origin. The p a r a m e t e r e is the eccentricity. The locus is circle if e -- 0, an ellipse if 0 < e < 1, a parabola if e = 1, and a hyperbola if e > 0. 2, is called the perihelion if the sun is the attractor at the origin or the perigee if the earth is. The angle f is called the true anomaly and g the argument o] the perihelion (perigee). 8 Spherical Coordinates Usually the three dimensional Kepler problem is reduced to the planar problem because conservation of angular m o m e n t u m implies that the motion takes place in a plane perpendicular to the angular m o m e n t u m vector.