Curvature estimates and gap theorems for expanding Ricci solitons

Pak-Yeung Chan

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arXiv · 2001.11487

Curvature estimates and gap theorems for expanding Ricci solitons

Pak-Yeung Chan

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Abstract

We derive a sharp lower bound for the scalar curvature of non-flat and non-compact expanding gradient Ricci soliton provided that the scalar curvature is non-negative and the potential function is proper. We also give an upper bound for the scalar curvature of noncompact expander when the Ricci curvature is nonpositive and the potential function is proper. We then provide a sufficient condition for the scalar curvature of expanding soliton being nonnegative. We also estimate the curvature of expanding soliton in dimensions three and four. As an application, we prove a gap theorem on three dimensional gradient expander.

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Pak-Yeung Chan. 2020-01-30. Curvature estimates and gap theorems for expanding Ricci solitons. https://arxiv.org/abs/2001.11487

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