HIDDEN DISSIPATION AND CONVEXITY FOR KIMURA EQUATIONS.

In this paper we establish a rigorous gradient flow structure for one-dimensional Kimura equations with respect to some Wasserstein--Shahshahani optimal transport geometry. This is achieved by first conditioning the underlying stochastic process to nonfixation in order to get rid of singularities on the boundaries, and then studying the conditioned Q-process from a more traditional and variational point of view. In doing so we complete the work initiated in [Chalub et al., Acta Appl. Math., 171 (2021), pp. 1--50], where the gradient flow was identified only formally. The approach is based on the energy dissipation inequality and evolution variational inequality notions of metric gradient flows. Building up on some convexity of the driving entropy functional, we obtain new contraction estimates and quantitative long-time convergence towards the stationary distribution. [ABSTRACT FROM AUTHOR]