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Complex, contact, Riemannian, pseudo-Riemannian and Finsler geometry, relativity, gauge theory, global analysis.

2 votes
0 answers
219 views

Asymptotic expansion of the Hessian of the distance function

This question originates from another question. Big thanks to MySheperd whose answer to that question clarified my thoughts. Let $(M,g)$ be an $n$-dimensional complete Riemannian manifold and $r$ is t …
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5 votes
1 answer
2k views

Hessian of the distance function--comparison with the space form with constant sectional cur...

Let $M$ be an $n$-dimensional complete Riemannian manifold and $r$ is the distance function to a fixed point. The Hessian comparison theorem says that if the sectional curvature of $M$ is bounded (pre …
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8 votes
1 answer
752 views

Cobordism invariants: topological v.s. geometric

Some cobordism invariants are not cohomology classes. Such as the $\mathbb{Z}_{16}$-valued eta invariant $\eta$ of $\Omega_4^{Pin^+}$, the $\mathbb{Z}_8$-valued Arf-Brown-Kervaire invariant ABK of $\O …
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