Milman's Gaussian spectral conjecture under the CD condition

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Let dd be a positive integer, let (Rd,g,μ)(\mathbb{R}^d,g,\mu) satisfy the curvature-dimension condition CD⁡(ρ,∞)\operatorname{CD}(\rho,\infty) for some ρ>0\rho>0, and let λk(Rd,g,μ)\lambda_k(\mathbb{R}^d,g,\mu) denote the kkth eigenvalue in the associated weighted spectral problem. Define the centered Gaussian probability measure by

γρd(dx)=cρde−ρ∣x∣2/2 dx,\gamma_\rho^d(\mathrm{d}x)=c_\rho^d e^{-\rho|x|^2/2}\,\mathrm{d}x,

where cρd>0c_\rho^d>0 is a normalization constant. Milman's Gaussian spectral conjecture. For every k≥1k\geq 1,

λk(Rd,g,μ)≥λk(Rd,∣⋅∣,γρd).\lambda_k(\mathbb{R}^d,g,\mu)\geq\lambda_k(\mathbb{R}^d,|\cdot|,\gamma_\rho^d).

This is the infinite-dimensional-model analogue in Euclidean space of the spherical spectral comparison conjecture. The supplied text gives no evidence that this claim has been resolved.

References

Primary source

Shrey Aryan, “Spectral Obstructions to Contracting Transport Maps on Curved Spaces”, arXiv:2605.24705 (2026).

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