Milman's contracting Gaussian transport conjecture under the CD condition

Let dd be a positive integer, let (Rd,g,μ)(\mathbb{R}^d,g,\mu) satisfy CD⁡(ρ,∞)\operatorname{CD}(\rho,\infty) for some ρ>0\rho>0, and define the centered Gaussian probability measure

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 contracting Gaussian transport conjecture. There exists a map

T:(Rd,∣⋅∣,γρd)→(Rd,g,μ)T:(\mathbb{R}^d,|\cdot|,\gamma_\rho^d)\to(\mathbb{R}^d,g,\mu)

that pushes forward γρd\gamma_\rho^d onto μ\mu up to a finite constant and contracts the corresponding metrics. This is the transport-map counterpart of the Gaussian 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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