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Эта публикация цитируется в 5 научных статьях (всего в 5 статьях)
Knauf’s Degree and Monodromy in Planar Potential Scattering
Nikolay Martynchuk, Holger Waalkens Johann Bernoulli Institute for Mathematics and Computer Science,
University of Groningen,
P.O. Box 407, 9700 AK Groningen, The Netherlands
Аннотация:
We consider Hamiltonian systems on $(T^{*}\mathbb R^2, dq \wedge dp)$ defined by a Hamiltonian function $H$ of the “classical” form
$H = p^2/2 + V(q)$.
A reasonable
decay assumption
$V(q) \to 0, \, \|q\| \to \infty,$ allows one to compare a given distribution of initial conditions at $t = - \infty$ with their final distribution
at $t = + \infty$. To describe this Knauf introduced
a topological invariant $\text{deg}(E)$, which, for a nontrapping energy $E>0$, is given by the degree of the scattering map.
For rotationally symmetric potentials $V(q) = W(\|q\|)$, scattering monodromy has been introduced independently as another topological invariant.
In the present paper we demonstrate that, in the rotationally symmetric case,
Knauf's degree $\text{deg}(E)$ and scattering monodromy are related to one another. Specifically,
we show that scattering monodromy is given by the jump of the degree $\text{deg}(E)$, which appears
when the nontrapping energy $E$ goes from low to high values.
Ключевые слова:
Hamiltonian system, Liouville integrability, nontrapping degree of scattering, scattering monodromy.
Поступила в редакцию: 22.08.2016 Принята в печать: 17.11.2016
Образец цитирования:
Nikolay Martynchuk, Holger Waalkens, “Knauf’s Degree and Monodromy in Planar Potential Scattering”, Regul. Chaotic Dyn., 21:6 (2016), 697–706
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/rcd219 https://www.mathnet.ru/rus/rcd/v21/i6/p697
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