Brownian motion with respect to time-changing Riemannian metrics, applications to Ricci flow
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In this article, the notion de mouvement brownien sur une variete is generalised to the notion of transport parallele deforme, and a formule dintegration par parties a la Bismut is presented.Abstract:
Nous generalisons la notion de mouvement brownien sur une variete au cas du mouvement brownien dependant d’une famille de metriques. Cette generalisation est naturelle quand on s’interesse aux equations de la chaleur avec un laplacien qui depend du temps, ou de maniere generale dans le cadre de diffusions in-homogenes. Dans cet article, nous nous sommes particulierement interesses au flot de Ricci, flot geometrique fournissant une famille intrinseque de metriques. Nous donnons une notion de transport parallele le long d’un tel processus, puis nous generalisons celle du transport parallele deforme, et donnons une formule d’integration par parties a la Bismut dont nous tirons des formules de controle de norme de gradients de solutions d’equation de la chaleur in-homogene. Un des resultats principaux de cet article est une caracterisation probabiliste du flot de Ricci, en terme du transport parallele deforme. Dans les dernieres sections, nous donnons une definition canonique du transport parallele deforme en utilisant le flot stochastique, et nous en derivons une martingale intrinseque, qui pourrait donner des informations sur les singularites du flot.read more
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Heat Flow on Time‐Dependent Metric Measure Spaces and Super‐Ricci Flows
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Non-explosion of diffusion processes on manifolds with time-dependent metric
TL;DR: In this article, it was shown that Brownian diffusion processes on a manifold with time-dependent Riemannian metric cannot explode in finite time if the metric evolves under backwards Ricci flow.
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Coupling of Brownian motions and Perelman's L-functional
TL;DR: In this article, it was shown that on a manifold whose Riemannian metric evolves under backwards Ricci flow two Brownian motions can be coupled in such a way that their normalized L -distance is a supermartingale.
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Weak solutions for the Ricci flow I
Robert Haslhofer,Aaron Naber +1 more
TL;DR: In this paper, the authors introduce a new class of estimates for the Ricci flow, and use them both to characterize solutions of the Riemannian Ricci flows and to provide a notion of weak solutions to the Ricc flow in the nonsmooth setting.
Journal ArticleDOI
Non-explosion of diffusion processes on manifolds with time-dependent metric
TL;DR: In this paper, it was shown that Brownian motion cannot explode in finite time if the metric evolves under backwards Ricci flow, which makes it possible to remove the assumption of non-explosion in the pathwise contraction result established by Arnaudon et al.
References
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Three-manifolds with positive Ricci curvature
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