The projective-space metric-thickening stability conjecture

Let RPn\mathbb{R}\mathrm{P}^n be real projective nn-space, and let VRm\mathrm{VR}^m, VR\mathrm{VR}, and VRm\mathrm{VR}^m_\leq denote the metric, Vietoris–Rips, and measure Vietoris–Rips thickenings used in the paper. At scale 1/61/6, VRm(RPn;1/6)\mathrm{VR}^m_\leq(\mathbb{R}\mathrm{P}^n;1/6) has the homotopy type of a (2n+1)(2n+1)-dimensional CW complex.

Projective-space stability conjecture. There exists a sufficiently small ε>0\varepsilon>0 such that, for every 0<δ<ε0<\delta<\varepsilon, both VRm(RPn;1/6+δ)\mathrm{VR}^m(\mathbb{R}\mathrm{P}^n;1/6+\delta) and VR(RPn;1/6+δ)\mathrm{VR}(\mathbb{R}\mathrm{P}^n;1/6+\delta) have the homotopy type of VRm(RPn;1/6)\mathrm{VR}^m_\leq(\mathbb{R}\mathrm{P}^n;1/6).

If true, this would identify the homotopy type immediately above the critical scale 1/61/6 and relate the metric and ordinary Vietoris–Rips constructions to the measure thickening.

Sources & referencesView supporting material

Primary source

Henry Adams, Mark Heim and Chris Peterson, “Metric thickenings and group actions”, arXiv:1911.00732 (2020).

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