Binary path configuration conjecture for avalanche homology

Let PnP_n be the directed path on nn vertices, let βi\beta_i denote the ii-th Betti number of its avalanche complex, and let a binary configuration be an initial configuration whose entries are all either 00 or 11. Binary path homology conjecture. If c0\mathbf{c}_0 is a binary configuration, then for A(Pn,c0)\mathcal{A}(P_n,\mathbf{c}_0) we have

βi=0for all i>n21.\beta_i=0 \quad\text{for all } i>\left\lfloor\frac{n}{2}\right\rfloor-1.

This would identify the configuration in Proposition 1 as having the highest possible degree of homology among binary initial configurations. The conjecture is refuted once the binary condition is relaxed: A(P7,(5,0,1,1,1,1,1))\mathcal{A}(P_7,(5,0,1,1,1,1,1)) has β4=1\beta_4=1.

Sources & referencesView supporting material

Primary source

Henri Riihimäki and Jason P. Smith, “Avalanche homology of digraphs via sandpile dynamics”, arXiv:2606.26786 (2026).

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