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4 votes
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Riemannian submersions and associated fibre bundles

Furthermore, if $H$ acts isometrically both on $X$ and $X \times Y$, there exist metrics on $X/H$ and $X \times_H Y$ making $\pi_2$ and $\pi_3$ Riemannian submersions. …
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5 votes
0 answers
436 views

Upper bound on the sectional curvature of a Riemannian submersion

Consider the manifold $M := \operatorname{SO}(n) \times \mathbb{S}^{n-1}$, endowed with the product metric given by the bi-invariant metric of $\operatorname{SO}(n)$ and the round metric of $\mathbb{S …
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