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1	On an ODE Associated to the Ricci Flow Bhattacharya, Atreyee January 2013 (has links) (PDF) We discuss two topics in this talk. First we study compact Ricci-flat four dimensional manifolds without boundary and obtain point wise restrictions on curvature( not involving global quantities such as volume and diameter) which force the metric to be flat. We obtain the same conclusion for compact Ricci-flat K¨ahler surfaces with similar but weaker restrictions on holomorphic sectional curvature. Next we study the reaction ODE associated to the evolution of the Riemann curvature operator along the Ricci flow. We analyze the behavior of this ODE near algebraic curvature operators of certain special type that includes the Riemann curvature operators of various(locally) symmetric spaces. We explicitly show the existence of some solution curves to the ODE connecting the curvature operators of certain symmetric spaces. Although the results of these two themes are different, the underlying common feature is the reaction ODE which plays an important role in both. Riemannian Manifolds Curvature Ricci Flow Ricci-Flat 4-Manifolds Algebraic Curvature Operators Vector Fields Ricci-Flat Kahler Surfaces Riemannian Curvature Operator Kahler Manifolds Ordinary Differential Equations Differential Geometry Integral Curves Geometry