The conjecture on obstructions to desingularizing Ricci solitons

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Let (Mo,go)(M_o,g_o) be a Ricci soliton that is compact or has controlled asymptotics, such as cylindrical or conical asymptotics. Let eR‾+\overline{e{R}}^+ denote the relevant obstruction matrix, and suppose

det⁡eR‾+≠0.\mathop{\rm \det}\nolimits\overline{e{R}}^+\neq 0.

Ricci-soliton obstruction conjecture. Such (Mo,go)(M_o,g_o) cannot be the limit of smooth Ricci solitons in the pointed Gromov--Hausdorff sense.

This is proposed by analogy with known Einstein desingularization obstructions and would extend obstruction results to many Ricci solitons.

References

Primary source

Alix Deruelle and Tristan Ozuch, “Orbifold singularity formation along ancient and immortal Ricci flows”, arXiv:2410.16075 (2025).

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