Conjectured asymptotics for characteristic-polynomial moments of the real Ginibre ensemble

Let GNG_N be the N×NN\times N real Ginibre matrix, let γ\gamma vary in a fixed compact subset of (12,)(-\frac{1}{2},\infty), and let xx vary in a fixed compact subset of (1,1)(-1,1). The Barnes G-function is denoted by G(z)G(z). Conjectured characteristic-polynomial moment asymptotics. The following asymptotic expansion holds uniformly for γ\gamma and xx in these compact sets:

E(det(GNx)2γ)eNγ(1x2)(N2)γ2γ2(2π)γG(1/2)G(γ+1)G(γ+1/2),N.\mathbb{E}(|\det(G_N-x)|^{2\gamma}) \sim e^{-N\gamma(1-x^{2})}\left(\frac{N}{2}\right)^{\gamma^{2}-\frac{\gamma}{2}}\frac{(2\pi)^{\gamma}G(1/2)}{G(\gamma+1)G(\gamma+1/2)}, \quad N \to \infty.

This extends the preceding asymptotic formula at x=0x=0 to characteristic polynomials evaluated at points in the bulk interval (1,1)(-1,1), with uniformity on compact parameter sets. The claim is motivated by the established result at x=0x=0 and the corresponding integer-moment formula, but its general status is not resolved in the supplied text.

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Primary source

Alexander Serebryakov and Nick Simm, “Schur function expansion in non-Hermitian ensembles and averages of characteristic polynomials”, arXiv:2310.20686 (2024).

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