The Uryson width conjecture for metrics on spheres

Let mm and kk be as in the claim, let 1cm1\leq c\leq m, and let g0g_0 denote the unit sphere metric on SmS^m. For a metric gg on SmS^m, write ΛkgΛkg0\Lambda^k g\leq\Lambda^k g_0 for the comparison of the induced metrics on kk-vectors, and let UWmc(Sm,g)UW_{m-c}(S^m,g) denote the (mc)(m-c)-dimensional Uryson width. Uryson width conjecture. If

ΛkgΛkg0andkmc,\Lambda^k g\leq\Lambda^k g_0\quad\text{and}\quad k\leq\frac{m}{c},

then

UWmc(Sm,g)C(m).UW_{m-c}(S^m,g)\leq C(m).

The conjecture is known for c=1c=1 and is trivial for c=mc=m; it remains open for 2cm12\leq c\leq m-1.

Sources & referencesView supporting material

Primary source

Larry Guth, “Contraction of areas vs. topology of mappings”, arXiv:1211.1057 (2013).

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