Tuesday, November 13, 2012

1211.2477 (Roland Bauerschmidt et al.)

Structural stability of a dynamical system near a non-hyperbolic fixed

Roland Bauerschmidt, David C. Brydges, Gordon Slade
We prove structural stability under perturbations for a class of discrete-time dynamical systems near a non-hyperbolic fixed point. We reformulate the stability problem in terms of the well-posedness of an infinite-dimensional nonlinear ordinary differential equation in a Banach space of carefully weighted sequences. Using this, we prove existence and regularity of flows of the dynamical system which obey mixed initial and final boundary conditions. The class of dynamical systems we study, and the boundary conditions we impose, arose in a renormalisation group analysis of the 4-dimensional weakly self-avoiding walk.
View original: http://arxiv.org/abs/1211.2477

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