The conjecture on unobstructed contraction algebras and smooth centres

Let AA be a contraction algebra and let d=dimkAd=\dim_{\Bbbk} A. Denote by Md\mathcal{M}_d the moduli space of associative unital algebras of dimension dd, and by [A][A] the point corresponding to AA.

Unobstructedness and smooth-centre conjecture. The point [A][A] is smooth in Md\mathcal{M}_d, equivalently, AA is unobstructed; moreover, the dimension of the centre is constant in an open neighbourhood of [A][A], and the associated map

AZ(A)A\mapsto Z(A)

is smooth.

This conjecture proposes that contraction algebras have especially regular deformation theory: they are unobstructed, and their centres vary smoothly in families. It is motivated by the preceding result that contraction algebras of types AA and DD deform to a single semisimple algebra, but the supplied text gives no resolution of the conjecture.

Sources & referencesView supporting material

Primary source

Joachim Jelisiejew and Agata Smoktunowicz, “On a conjecture by Michael Wemyss regarding the calculation of GV invariants”, arXiv:2602.05919 (2026).

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