Simple connectivity of limits of universal covers of RCD spaces

Let (Xi,di,mi)(X_i,d_i,\mathfrak{m}_i) be a sequence of RCD(K,N;D)RCD^{\ast}(K,N;D) spaces, and let (X~i,d~i,m~i)(\widetilde{X}_i,\widetilde{d}_i,\widetilde{\mathfrak{m}}_i) be their universal covers. Assume that these universal covers converge in the pointed measured Gromov–Hausdorff sense to an RCD(K,N)RCD^{\ast}(K,N) space (X,d,m)(X,d,\mathfrak{m}). Universal-cover limit conjecture. The limit space (X,d,m)(X,d,\mathfrak{m}) is simply connected. The question concerns stability of simple connectivity, or equivalently of the universal-cover structure, under pointed measured Gromov–Hausdorff limits; the source states it as an open problem.

Sources & referencesView supporting material

Primary source

Jaime Santos-Rodriguez and Sergio Zamora, “On fundamental groups of RCD spaces”, arXiv:2210.07275 (2023).

Additional references

3 papers in this index state this conjecture (2005–2022). The statement above is taken from the most recent of them; the others are arXiv:2007.01985, arXiv:math/0508541.

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