Ricci curvature of double manifolds via isoparametric foliations

ChiaKuei Peng, Chao Qian

Given a closed manifold $M$ and a vector bundle $\xi$ of rank $n$ over $M$, by gluing two copies of the disc bundle of $\xi$, we can obtain a closed manifold $D(\xi ,M)$, the so-called d…