Contents Online

# Mathematical Research Letters

## Volume 24 (2017)

### Number 2

### Short-time persistence of bounded curvature under the Ricci flow

Pages: 427 – 447

DOI: http://dx.doi.org/10.4310/MRL.2017.v24.n2.a9

#### Author

#### Abstract

We use a first-order energy quantity to prove a strengthened statement of uniqueness for the Ricci flow. One consequence of this statement is that if a complete solution on a noncompact manifold has uniformly bounded Ricci curvature, then its sectional curvature will remain bounded for a short time if it is bounded initially. In other words, the Weyl curvature tensor of a complete solution to the Ricci flow cannot become unbounded instantaneously if the Ricci curvature remains bounded.

Received 30 July 2015

Published 24 July 2017