Crofton-type conjecture for random Hamiltonian diffeomorphisms
Crofton-type conjecture for random Hamiltonian diffeomorphisms
Let be a closed symplectic manifold and let be a centered, time-symmetric, exhaustive or periodically exhaustive law-defining datum. Let be a closed Lagrangian submanifold. The datum specifies an almost complex structure and the associated Riemannian metric .
Crofton-type conjecture. There exist a constant and a smooth function , depending only on and and satisfying
such that, for every closed Lagrangian submanifold ,
In particular, there exist constants such that
The conjecture seeks a Crofton formula for expected Lagrangian intersection counts, with a density-rescaled metric accounting for the nonuniform behavior seen in simulations. The supplied text gives numerical evidence and explains why the standard metric does not yield an exact formula, but states no resolution; the conjecture remains open.
Sources & referencesView supporting material
Primary source
Adrian Dawid, “Random Hamiltonians I: Probability measures and random walks on the Hamiltonian diffeomorphism group”, arXiv:2510.03190 (2025).
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