In this paper we study heat kernels associated with a Carnot group G, endowed with a family of collapsing left-invariant Riemannian metrics σε which converge in the Gromov- Hausdorff sense to a sub-Riemannian structure on G as ε→ 0. The main new contribution are Gaussian-type bounds on the heat kernel for the σε metrics which are stable as ε→0 and extend the previous time-independent estimates in [16]. As an application we study well posedness of the total variation flow of graph surfaces over a bounded domain in a step two Carnot group (G; σε ). We establish interior and boundary gradient estimates, and develop a Schauder theory which are stable as ε → 0. As a consequence we obtain long time existence of smooth solutions of the sub-Riemannian flow (ε = 0), which in turn yield sub-Riemannian minimal surfaces as t → ∞.
@article{bwmeta1.element.doi-10_2478_agms-2013-0006, author = {Luca Capogna and Giovanna Citti and Maria Manfredini}, title = {Uniform Gaussian Bounds for Subelliptic Heat Kernels and an Application to the Total Variation Flow of Graphs over Carnot Groups}, journal = {Analysis and Geometry in Metric Spaces}, volume = {1}, year = {2013}, pages = {255-275}, zbl = {1275.53055}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_2478_agms-2013-0006} }
Luca Capogna; Giovanna Citti; Maria Manfredini. Uniform Gaussian Bounds for Subelliptic Heat Kernels and an Application to the Total Variation Flow of Graphs over Carnot Groups. Analysis and Geometry in Metric Spaces, Tome 1 (2013) pp. 255-275. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_2478_agms-2013-0006/
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