Geodesic
Rolling in the Higgs model and elliptic functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 172 (2012) no. 1, pp. 138-154 Cet article a éte moissonné depuis la source Math-Net.Ru

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Asymptotic methods in nonlinear dynamics such as, for example, the Krylov–Bogoliubov averaging method and the KAM theory are commonly used to improve perturbation theory results in the regime of small oscillations. But for a series of problems in nonlinear dynamics, in particular, for the Higgs equation in field theory, not only the small-oscillation regime but also the rolling regime is of interest. Both slow- and fast-rolling regimes are important in the Friedmann cosmology. We present an asymptotic method for solving the Higgs equation in the rolling regime. We show that to improve the perturbation theory in the rolling regime, expanding a solution known in terms of elliptic functions not in trigonometric functions (as with the averaging method in the small-oscillation regime) but in hyperbolic functions turns out to be effective. We estimate the accuracy of the second approximation. We also investigate the Higgs equation with damping.
Keywords: asymptotic methods in nonlinear dynamics, rolling, Higgs model. 
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I. Ya. Aref'eva; I. V. Volovich; E. V. Piskovskiy. Rolling in the Higgs model and elliptic functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 172 (2012) no. 1, pp. 138-154. http://geodesic.mathdoc.fr/item/TMF_2012_172_1_a8/

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