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arXiv · 2606.09742

Towards the Lov\'{a}sz conjecture via sublinear expanders

Matija Bucić·Micha Christoph·Alexey Pokrovskiy·Raphael Steiner
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Abstract

Lov\'{a}sz' famous Hamiltonicity conjecture (1969) states that every connected vertex-transitive graph has a Hamiltonian path. A stronger version of the conjecture, often attributed to Thomassen (1978), states that every sufficiently large such graph even has a Hamiltonian cycle. Despite the great amount of attention these conjectures have attracted over the past decades both in the combinatorial and algebraic communities, for more than 40 years the best known lower bound for the maximum length of a cycle (path) in a connected vertex-transitive graph of order $n$ remained of the form $\Omega(\sqrt{n})$, due to Babai (1979). A series of recent works has successively improved the exponent in this lower bound further. In this paper, improving the previous state-of-the-art bound $\Omega(n^{9/14})$ due to Norin et al.~(2025), we prove that every connected vertex-transitive graph of order $n$ contains a cycle of length at least $n^{2/3-o(1)}$. This hits a natural barrier for several existing approaches from previous work. Our proofs combine recent embedding techniques for paths in sublinear expanders, sublinear expander decompositions of almost-regular graphs, and several additional combinatorial ideas.

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Matija Bucić, Micha Christoph, Alexey Pokrovskiy, Raphael Steiner. 2026-06-08. Towards the Lov\'{a}sz conjecture via sublinear expanders. https://arxiv.org/abs/2606.09742

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