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7 votes

Non-compact manifolds of positive/non-negative Ricci curvature

There are ways to glue while preserving positive Ricci curvature, but of course they require some geometric control near $\partial M$. Let me mention two relevant papers: On the moduli space of pos …
Igor Belegradek's user avatar
5 votes

How does curvature change under perturbations of a Riemannian metric?

It is a fact (due to Riemann I believe) that in normal coordinates, the Taylor expansion of $g_{ij}$ is $\delta_{ij}+\frac{1}{3}R_{ikjl}x^k x^l+O(||x||^3)$, where $R_{ikjl}$ are components of the $(4, …
Igor Belegradek's user avatar