Hessian metrics, CD(K,N)-spaces, and optimal transportation of log-concave measures
Hessian metrics, CD(K,N)-spaces, and optimal transportation of log-concave measures
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Hessian 度量、CD(K,N) 空间和对数凹度量的最优传输
DOI:
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发表时间:
2012
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通讯作者:
A. Kolesnikov
中科院分区:
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作者:
A. Kolesnikov
We study the optimal transportation mapping
$
abla Phi : mathbb{R}^d mapsto mathbb{R}^d$ pushing forward a probability measure $mu = e^{-V} dx$ onto another probability measure $
u = e^{-W} dx$.
Following a classical
approach of E. Calabi we introduce the Riemannian metric $g = D^2 Phi$ on $mathbb{R}^d$ and study spectral properties of the metric-measure space
$M=(mathbb{R}^d, g, mu)$.
We prove, in particular, that $M$ admits a non-negative Bakry--Emery tensor provided both $V$ and $W$ are convex.
If the target measure $
u$ is the Lebesgue measure on a convex set $Omega$ and $mu$ is log-concave we prove that $M$ is a $CD(K,N)$ space.
Applications of these results include some global dimension-free a priori estimates of $| D^2 Phi|$. With the help of comparison techniques on Riemannian manifolds and probabilistic concentration arguments
we proof some diameter estimates for $M$.