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Fujita exponent for the fractional sub-Laplace semilinear heat equation with forcing term on the Heisenberg group (2505.03619v1)

Published 6 May 2025 in math.AP

Abstract: In this paper, we study the semilinear heat equation with a forcing term, driven by the fractional sub-Laplacian (-\Delta_{\mathbbm{H}N})s of order $s\in (0,1),$ on the Heisenberg group $\mathbbm{H}N$. We establish that the Fujita exponent, a critical threshold that delimits different dynamical regimes of this equation, is $$p_F\coloneqq\frac{Q}{Q-2s},$$ where $Q\coloneqq 2N+2$ is the homogeneous dimension of $\mathbbm{H}N$. We prove the existence of global-in-time solutions for the supercritical case $(p>p_F),$ and the non-existence of global-in-time solutions for the subcritical case $(1<p<p_F).$ For the critical case $p=p_F,$ we provide a class of functions for which the solution blows up in finite time. These results extend the classical Fujita phenomenon to a sub-Riemannian setting with the nonlocal effects of the fractional sub-Laplacian. Our proof methods intertwine analytic techniques with the geometric structure of the Heisenberg group.

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