Félix–Oprea–Tanré's generalised toral rank conjecture

Let FEBF\hookrightarrow E\to B be a quasi-nilpotent fibration, with fibre FF equal to a torus TrT^r, and suppose that the rational cohomology of BB is finite dimensional. Generalised toral rank conjecture. One should have

dimH(E;Q)2r.\dim H^*(E;{\mathbb{Q}})\geq 2^r.

The source also asks whether, if FF is merely rationally elliptic, the weaker inequality dimH(E;Q)dimH(F;Q)\dim H^*(E;{\mathbb{Q}})\geq\dim H^*(F;{\mathbb{Q}}) holds. This formulation was proposed by Félix, Oprea, and Tanré; the article provides counterexamples to the generalised claim, so it is refuted.

Sources & referencesView supporting material

Primary source

Manuel Amann, “Counter-Examples to a generalised Toral Rank Conjecture”, arXiv:2011.13411 (2020).

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