Gentlest Ascent Dynamics on Manifolds Defined by Adaptively Sampled Point-Clouds.

Finding saddle points of dynamical systems is an important problem in practical applications, such as the study of rare events of molecular systems. Gentlest ascent dynamics (GAD) (10.1088/0951-7715/24/6/008) is one of a number of algorithms in existence that attempt to find saddle points. It works by deriving a new dynamical system in which saddle points of the original system become stable equilibria. GAD has been recently generalized to the study of dynamical systems on manifolds (differential algebraic equations) described by equality constraints (10.1007/s10915-022-01838-3) and given in an extrinsic formulation. In this paper, we present an extension of GAD to manifolds defined by point-clouds, formulated by using an intrinsic viewpoint. These point-clouds are adaptively sampled during an iterative process that drives the system from the initial conformation (typically in the neighborhood of a stable equilibrium) to a saddle point. Our method requires the reactant (initial conformation), does not require the explicit constraint equations to be specified, and is purely data-driven.