Mathematics – Analysis of PDEs
Scientific paper
2011-09-21
Mathematics
Analysis of PDEs
Scientific paper
We show that the Harnack inequality for a class of degenerate parabolic quasilinear PDE $$\p_t u=X_i^* A_i(x,t,u,Xu)+ B(x,t,u,Xu),$$ associated to a system of Lipschitz continuous vector fields $X=(X_1,...,X_m)$ in in $\Om\times (0,T)$ with $\Om \subset M$ an open subset of a manifold $M$ with control metric $d$ corresponding to $X$ and a measure $d\sigma$ follows from the basic hypothesis of doubling condition and a weak Poincar\'e inequality. We also show that such hypothesis hold for a class of Riemannian metrics $g_\e$ collapsing to a sub-Riemannian metric $\lim_{\e\to 0} g_\e=g_0$ uniformly in the parameter $\e\ge 0$.
Capogna Luca
Citti Giovanna
Rea Garrett
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