Rigid motions: action-angles, relative cohomology and polynomials with roots on the unit circle

Details Rigid motions: action-angles, relative cohomology and polynomials with roots on the unit circle Rigid motions: action-angles, relative cohomology and polynomials with roots on the unit circle

2012-02-13

arxiv.org/abs/1202.2741v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

26 pages, 1 figure

Scientific paper

Revisiting canonical integration of the classical solid near a uniform rotation, canonical action angle coordinates, hyperbolic and elliptic, are constructed in terms of various power series with coefficients which are polynomials in a variable $r^2$ depending on the inertia moments. Normal forms are derived via the analysis of a relative cohomology problem and shown to be obtainable without the use of ellitptic integrals (unlike the derivation of the action-angles). Results and conjectures also emerge about the properties of the above polynomials and the location of their roots. In particular a class of polynomials with all roots on the unit circle arises.

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