Weak Horrocks conjecture for finite-dimensional modules

Let S(m)=Q[v1,,vm]S(m)=\mathbb Q[v_1,\dots,v_m] be a polynomial ring, and let MM be a finite-dimensional graded S(m)S(m)-module. Here TorS(m)(M,Q)\operatorname{Tor}_{S(m)}^*(M,\mathbb Q) denotes the total Tor space, and dim\mathop{\mathrm{dim}} is dimension over Q\mathbb Q.

Weak Horrocks conjecture. One has

dimTorS(m)(M,Q)2m.\mathop{\mathrm{dim}} \operatorname{Tor}_{S(m)}^*(M,\mathbb Q)\geqslant 2^m.

This is presented as a weaker variant of the preceding Horrocks conjecture and is relevant to estimating the cohomology rank of spaces with torus actions. The source does not provide evidence of a resolution for this weak variant.

Sources & referencesView supporting material

Primary source

Yury Ustinovsky, “On almost free torus actions and Horrocks conjecture”, arXiv:1203.3685 (2012).

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