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heat content asymptotics for sub-Riemannian manifolds

Tommaso Rossi
Institution: 
SISSA
Schedule: 
Friday, December 11, 2020 - 16:00
Location: 
Zoom Meeting
Abstract: 

We study the small-time asymptotics of the heat content of smooth non-characteristic domains of a general rank-varying sub-Riemannian structure, equipped with an arbitrary smooth measure. By adapting to the sub-Riemannian case a technique due to Savo, we establish the existence of the full asymptotic series. We compute explicitly the coefficients up to order five, in terms of sub-Riemannian invariants of the domain and its boundary. Furthermore, we prove that every coefficient can be obtained as the limit of the corresponding one for a suitable Riemannian extension. As a byproduct of our fifth-order analysis, we prove that the higher order coefficients in the expansion can blow-up in presence of characteristic points. This is a joint work with Luca Rizzi.

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