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nlin.CD2021★ 7 cited
Precessing ellipses as the building blocks of spiral arms
M. Harsoula, K. Zouloumi, C. Efthymiopoulos +1
Stable periodic orbits in spiral galactic models that form families of precessing ellipses can create spiral density waves similar to those that are observed in real grand-design g…
nlin.CD2015★ 10 cited
Analytical description of the structure of chaos
M. Harsoula, G. Contopoulos, C. Efthymiopoulos
We consider analytical formulae that describe the chaotic regions around the main periodic orbit of the Hénon map. Following our previous paper (Efthymiopoulos, Contopoul…