Andersen–Masbaum–Ueno conjecture for mapping class groups

Let Σg,n\Sigma_{g,n} be a compact oriented surface, and let

Mod(Σg,n)=Homeo+(Σg,n)/Homeo0(Σg,n)\mathrm{Mod}(\Sigma_{g,n})=\mathrm{Homeo}^+(\Sigma_{g,n})/\mathrm{Homeo}_0(\Sigma_{g,n})

be its mapping class group, with homeomorphisms and isotopies fixed on the boundary. For an odd integer r3r\geq 3, let ρr\rho_r denote the direct sum of the SO3\mathrm{SO}_3-Witten–Reshetikhin–Turaev representations associated to boundary colorings at a primitive rr-th root of unity. Andersen–Masbaum–Ueno conjecture. For every fMod(Σg,n)f\in \mathrm{Mod}(\Sigma_{g,n}), the mapping class ff has a pseudo-Anosov part if and only if ρr(f)\rho_r(f) has infinite order for all sufficiently large odd integers r3r\geq 3. The conjecture proposes a representation-theoretic criterion for detecting pseudo-Anosov components of mapping classes. Its status is not resolved in the supplied source.

Sources & referencesView supporting material

Primary source

Renaud Detcherry, “The Andersen-Masbaum-Ueno conjecture for the derived subgroup of the Johnson kernel”, arXiv:2603.29397 (2026).

Additional references

7 papers in this index state this conjecture (2016–2026). The statement above is taken from the most recent of them; the others are arXiv:2304.00682, arXiv:2203.10745, arXiv:2005.11447, arXiv:2001.04518, arXiv:1711.03251, arXiv:1603.03456.

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.