Geodesic
Morse-Bott energy function for surface $\Omega$-stable flows
Žurnal Srednevolžskogo matematičeskogo obŝestva, Tome 22 (2020) no. 4, pp. 434-441.

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In this paper, we consider the class of $\Omega$-stable flows on surfaces, i.e. flows on surfaces with the non-wandering set consisting of a finite number of hyperbolic fixed points and a finite number of hyperbolic limit cycles. The class of $\Omega$ -stable flows is a generalization of the class of Morse-Smale flows, admitting the presence of saddle connections that do not form cycles. The authors have constructed the Morse-Bott energy function for any such flow. The results obtained are an ideological continuation of the classical works of S. Smale, who proved the existence of the Morse energy function for gradient-like flows, and K. Meyer, who established the existence of the Morse-Bott energy function for Morse-Smale flows. The specificity of $\Omega$-stable flows takes them beyond the framework of structural stability, but the decrease along the trajectories of such flows is still tracked by the regular Lyapunov function.
Keywords: $\Omega$-stable flow, energy function, limit cycle, Morse-Bott function
Mots-clés : surface. 
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A. E. Kolobyanina; V. E. Kruglov. Morse-Bott energy function for surface $\Omega$-stable flows. Žurnal Srednevolžskogo matematičeskogo obŝestva, Tome 22 (2020) no. 4, pp. 434-441. http://geodesic.mathdoc.fr/item/SVMO_2020_22_4_a2/

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[5] A. E. Kolobyanina, V. E. Kruglov, “Energy function for $\Omega$-stable flows without limit cycles on surfaces”, SVMO, 21:4 (2019), 460–468 (in Russ.)