LTP-strong conjecture for crepant Weierstrass fibrations

Let BB be a smooth compact manifold, let WW be a Weierstrass fibration in

Z=P(OBωB2ωB3),Z=\mathbb{P}(\mathscr{O}_B\oplus\omega_B^{-2}\oplus\omega_B^{-3}),

and let W~W\widetilde{W}\to W be a crepant resolution obtained by a sequence of blowups of ZZ in smooth centers, followed by taking the proper transform of WW. Write Z~\widetilde{Z} for the resulting blown-up ambient space, and let

i:W~Z~i:\widetilde{W}\hookrightarrow\widetilde{Z}

be the inclusion. LTP-strong conjecture. The inclusion induces an isomorphism of rational Hodge structures

i:Hk(Z~,Q)Hk(W~,Q)fork<dimW.i^*:H^k(\widetilde{Z},\mathbb{Q})\longrightarrow H^k(\widetilde{W},\mathbb{Q})\quad\text{for}\quad k<\dim W.

This is the stronger form of the numerical LTP-weak conjecture and is formulated after an example showing that an integral Hodge-structure isomorphism can fail because of torsion. Its status is not resolved in the supplied text.

Sources & referencesView supporting material

Primary source

Andrea Cattaneo and James Fullwood, “On a Lefschetz-type phenomenon for elliptic Calabi–Yaus”, arXiv:1901.10146 (2022).

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