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## Comportement asymptotique des solutions de l'équation de la chaleur sur les espaces symétriques de type non-compact

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Jean-Philippe Anker
• Function : Author
Effie Papageorgiou
• Function : Author
Hong-Wei Zhang
• Function : Author

#### Abstract

This paper is twofold. The first part aims to study the long-time asymptotic behavior of solutions to the heat equation on Riemannian symmetric spaces $G/K$ of noncompact type and of general rank. We show that any solution to the heat equation with bi-$K$-invariant $L^{1}$ initial data behaves asymptotically as the mass times the fundamental solution, and provide a counterexample in the non bi-$K$-invariant case. These answer problems recently raised by J.L. Vázquez. In the second part, we investigate the long-time asymptotic behavior of solutions to the heat equation associated with the so-called distinguished Laplacian on $G/K$. Interestingly, we observe in this case phenomena which are similar to the Euclidean setting, namely $L^1$ asymptotic convergence with no bi-$K$-invariance condition and strong $L^{\infty}$ convergence.

#### Domains

Mathematics [math]

### Dates and versions

hal-03459571 , version 1 (01-12-2021)

### Identifiers

• HAL Id : hal-03459571 , version 1

### Cite

Jean-Philippe Anker, Effie Papageorgiou, Hong-Wei Zhang. Asymptotic behavior of solutions to the heat equation on noncompact symmetric spaces. 2021. ⟨hal-03459571v1⟩

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