Odd-multiplicity determinant conjecture for Hodge–Riemann forms on pseudomanifolds

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Let kk be a field of arbitrary characteristic, and let Δ\Delta be a connected oriented simplicial pseudomanifold over kk of dimension d−1d-1 with vertex set VV. For 0≤q≤d/20\leq q\leq d/2, let DqD_q denote the determinant of the Hodge–Riemann form on H‾Fq(Δ)\overline{H}_F^q(\Delta), and let F⊆VF\subseteq V have size dd. Write ord⁡[F](Dq)\operatorname{ord}_{[F]}(D_q) for the order of vanishing of DqD_q along [F][F]. Odd-multiplicity determinant conjecture.

ord⁡[F](Dq)={1if F is a facet of Δ,0otherwise.\operatorname{ord}_{[F]}(D_q)= \begin{cases} 1 & \text{if }F\text{ is a facet of }\Delta,\\ 0 & \text{otherwise}. \end{cases}

This is the proposed extension of the determinant formula for the Hodge–Riemann form from homology manifolds to pseudomanifolds in arbitrary characteristic. The supplied text gives no resolution, so the conjecture remains open.

References

Primary source

Matt Larson, Isabella Novik and Alan Stapledon, “Determinants of Hodge-Riemann forms”, arXiv:2408.02737 (2024).

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