Gaussian marginal conjecture for the pure-noise Gibbs measure

Let SN\mathcal{S}^N be the sphere, let H0H_0 be the pure-noise Hamiltonian, and for β>0\beta>0 let π0,β\pi_{0,\beta} be the Gibbs measure with density proportional to exp(βH0(x))\exp(-\beta H_0(x)) with respect to spherical volume. Write π0,β(x1)\pi_{0,\beta}(x_1\in\cdot) for the marginal law of the first coordinate, let γ\gamma be the law of a standard Gaussian, and let π0,β+\pi_{0,\beta}^+ be π0,β\pi_{0,\beta} conditioned on {x1>0}\{x_1>0\}. Gaussian marginal conjecture. For every β>0\beta>0, almost surely with respect to the disorder, the marginal measures converge weakly:

π0,β(x1)Nγ().\pi_{0,\beta}(x_1\in\cdot)\xrightarrow[N\to\infty]{}\gamma(\cdot).

In particular, π0,β+\pi_{0,\beta}^+ satisfies Condition 2. This conjecture would imply an almost-sure recovery result for k>2k>2 and α>αc()\alpha>\alpha_c(\infty), as well as the matching weak-recovery result for k<2k<2, and is also of independent interest in statistical physics.

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Primary source

Gerard Ben Arous, Reza Gheissari and Aukosh Jagannath, “Algorithmic thresholds for tensor PCA”, arXiv:1808.00921 (2019).

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