Zung's spectral-sequence conjecture relating and
Zung's spectral-sequence conjecture relating and
Let be the flow under consideration, let be its associated graph, and let and be the chain complexes described above, where is a chosen collection of closed orbits relative to which has no perfect fits. A multi-loop is a loop, possibly non-embedded, in ; a non-embeddedness grading records the non-embeddedness of a multi-loop. Consider a chain complex generated by all multi-loops of , with differential counting strumming of multi-loops and cobordisms of orbits along transverse surfaces. Decompose this differential according to the two filtrations described below. Zung's conjecture. The differential on admits the two stated filtrations: one by non-embeddedness, with components and , and one by surface type, with components counting strumming, counting Fried pants, and counting other transverse surfaces. The spectral sequence from the first filtration collapses at the page and gives , while the spectral sequence from the second filtration has as its page. The first collapse is expected because non-embedded multi-loops have an even number of resolutions, and the second because cancels all but one multi-loop for each multi-orbit. This conjecture proposes a chain-level reconciliation of the two complexes: the first filtration explains the relation with , and the second explains the relation with .
Sources & referencesView supporting material
Primary source
Antonio Alfieri and Chi Cheuk Tsang, “Heegaard Floer theory and pseudo-Anosov flows II: Differential and Fried pants”, arXiv:2506.07163 (2025).
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