Nick Hunter-Jones's moment conjecture for permanents of Haar unitary matrices

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Let U(d)U(d) denote a Haar-random d×dd\times d unitary matrix, and let tt be a positive integer. Hunter-Jones's conjecture. The permanent moment satisfies

EM∼U(d)∣Perm⁡(M)∣2t≈t!(2d−1d)t.\mathbb E_{M\sim U(d)}\left|\operatorname{Perm}(M)\right|^{2t}\approx \frac{t!}{\binom{2d-1}{d}^{t}}.

The source attributes this conjecture to Nick Hunter-Jones and supports it with numerical experiments. It is compared with the lower bound for moments of permanents of Haar-random unitary minors, but no resolution is given.

References

Primary source

Sepehr Nezami, “Permanent of random matrices from representation theory: moments, numerics, concentration, and comments on hardness of boson-sampling”, arXiv:2104.06423 (2021).

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