no. 5
On the relation between elliptic and parabolic Harnack inequalities
[Sur les liens entre inégalités de Harnack elliptiques et paraboliques]
Hebisch, Waldemar1 ; Saloff-Coste, Laurent2
1 Wroclaw University, Institute of Mathematics, Wroclaw (Pologne)
2 Cornell University, Department of Mathematics, Ithaca NY (USA)
Annales de l'Institut Fourier, Tome 51 (2001) no. 5, pp. 1437-1481.

Sous l’hypothèse qu’une certaine inégalité de Sobolev est satisfaite, nous montrons qu’une inégalité de Harnack elliptique uniforme implique sa version parabolique. Ni l’inégalité de Sobolev ni l’inégalité de Harnack elliptique, n’implique à elle seule l’inégalité de Harnack parabolique en question; chacune est une condition nécessaire. En conséquence, nous obtenons l’équivalence entre l’inégalité de Harnack parabolique pour le laplacien sur une variété riemannienne M, (i.e., pour ∂ t +Δ) et l’inégalité de Harnack elliptique pour -∂ t 2 +Δ sur ℝ×M.

We show that, if a certain Sobolev inequality holds, then a scale-invariant elliptic Harnack inequality suffices to imply its a priori stronger parabolic counterpart. Neither the relative Sobolev inequality nor the elliptic Harnack inequality alone suffices to imply the parabolic Harnack inequality in question; both are necessary conditions. As an application, we show the equivalence between parabolic Harnack inequality for Δ on M, (i.e., for ∂ t +Δ) and elliptic Harnack inequality for -∂ t 2 +Δ on ℝ×M.

DOI : 10.5802/aif.1861
Classification : 58J05, 58J35, 31C25, 58J65, 60J65
Keywords: Laplace equation, heat equation, Harnack inequality, Dirichlet spaces, two-sided Gaussian bounds
Mot clés : équation de Laplace, équation de la chaleur, inégalité de Harnack, espaces de Dirichlet, bornes gaussiennes
Hebisch, Waldemar 1 ; Saloff-Coste, Laurent 2

1 Wroclaw University, Institute of Mathematics, Wroclaw (Pologne)
2 Cornell University, Department of Mathematics, Ithaca NY (USA) 
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Hebisch, Waldemar; Saloff-Coste, Laurent. On the relation between elliptic and parabolic Harnack inequalities. Annales de l'Institut Fourier, Tome 51 (2001) no. 5, pp. 1437-1481. doi : 10.5802/aif.1861. http://www.numdam.org/articles/10.5802/aif.1861/

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