Dao–Kurano's dimension-bound vanishing conjecture for the Hochster theta pairing

Let AA be a local hypersurface of Krull dimension dd with an isolated singularity, and let MM and NN be finitely generated AA-modules. The Hochster theta pairing is defined by

θ(M,N)=l(Tor2iA(M,N))l(Tor2i+1A(M,N)),i0.\theta(M,N)=l(\operatorname{Tor}_{2i}^{A}(M,N))-l(\operatorname{Tor}_{2i+1}^{A}(M,N)),\qquad i\gg0.

Dao–Kurano's conjecture. If dim(M)d2\dim(M)\leqslant \frac{d}{2}, then

θ(M,N)=0.\theta(M,N)=0.

This is one of Dao–Kurano's conjectures on the vanishing of the Hochster theta pairing for modules over isolated hypersurface singularities. The supplied source does not state whether this particular assertion has been resolved.

Sources & referencesView supporting material

Primary source

Michael K. Brown, “On a Conjecture of Dao-Kurano”, arXiv:1608.07116 (2017).

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