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Article Dans Une Revue Physical review‎. D Année : 2024

A new derivation of the amplitude of asymptotic oscillatory tails of weakly delocalized solitons

Résumé

The computation of the amplitude, $\alpha$, of asymptotic standing wave tails of weakly delocalized, stationary solutions in a fifth-order Korteweg-de Vries equation is revisited. Assuming the coefficient of the fifth order derivative term, $\epsilon^2\ll1$, a new derivation of the ``beyond all orders in $\epsilon$'' amplitude, $\alpha$, is presented. It is shown by asymptotic matching techniques, extended to higher orders in $\epsilon$, that the value of $\alpha$ can be obtained from the asymmetry at the center of the unique solution exponentially decaying in one direction. This observation, complemented by some fundamental results of Hammersley and Mazzarino [Proc. R. Soc. Lond. A 424, 19 (1989)], not only sheds new light on the computation of $\alpha$, but also greatly facilitates its numerical determination to a remarkable precision for so small values of $\epsilon$, which are beyond the capabilities of standard numerical methods.

Dates et versions

hal-04566483 , version 1 (02-05-2024)

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Citer

Gyula Fodor, Péter Forgács, Muneeb Mushtaq. A new derivation of the amplitude of asymptotic oscillatory tails of weakly delocalized solitons. Physical review‎. D, 2024, 109 (12), pp.125011. ⟨10.1103/PhysRevD.109.125011⟩. ⟨hal-04566483⟩
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