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arXiv 2602.00623math.PR
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适应的Bures-Wasserstein空间的几何学

The geometry of the adapted Bures--Wasserstein space

ETH Zürich(苏黎世联邦理工学院);National University of Singapore(新加坡国立大学);TU Graz(格拉茨工业大学)

Beatrice Acciaio, Daniel Bartl, Anne Grass, Songyan Hou, Gudmund Pammer

AI总结:

本文研究了适应的Bures-Wasserstein空间的几何结构,展示了其作为非负曲率Alexandrov空间的性质,并提供了切锥和指数映射的显式描述。

摘要:

适应的Bures-Wasserstein空间由广义过程组成,配备了适应的Wasserstein距离。它可以被视为在随机过程设定中,传统Wasserstein距离不足时的Bures-Wasserstein空间的类比。我们为适应的Bures-Wasserstein空间发展了一套全面的几何理论,从而也提供了关于适应最优运输精细几何结构的首个结果。特别是,我们证明适应的Bures-Wasserstein空间是一个非负曲率的Alexandrov空间,并提供了切锥和指数映射的显式描述。此外,我们证明满足自然非退化条件的高斯过程形成一个测地凸子空间。这个子空间精确地由其切锥是线性的性质所刻画,因此与切空间一致。

英文摘要:

The adapted Bures--Wasserstein space consists of Gaussian processes endowed with the adapted Wasserstein distance. It can be viewed as the analogue of the classical Bures--Wasserstein space in optimal transport for the setting of stochastic processes, where the standard Wasserstein distance is inadequate and has to be replaced by its adapted counterpart. We develop a comprehensive geometric theory for the adapted Bures--Wasserstein space, thereby also providing the first results on the fine geometric structure of adapted optimal transport. In particular, we show that the adapted Bures--Wasserstein space is an Alexandrov space with non-negative curvature and provide explicit descriptions of tangent cones and exponential maps. Moreover, we show that Gaussian processes satisfying a natural non-degeneracy condition form a geodesically convex subspace. This subspace is characterized precisely by the property that its tangent cones are linear and hence coincide with the tangent space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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