Functional inequalities and Hamilton-Jacobi Equations in Geodesic Spaces

Details Functional inequalities and Hamilton-Jacobi Equations in Geodesic Spaces Functional inequalities and Hamilton-Jacobi Equations in Geodesic Spaces

2009-06-02

arxiv.org/abs/0906.0476v1

Mathematics

Functional Analysis

21 pages

Scientific paper

We study the connection between the $p$--Talagrand inequality and the $q$--logarithmic Sololev inequality for conjugate exponents $p\geq 2$, $q\leq 2$ in proper geodesic metric spaces. By means of a general Hamilton--Jacobi semigroup we prove that these are equivalent, and moreover equivalent to the hypercontractivity of the Hamilton--Jacobi semigroup. Our results generalize those of Lott and Villani. They can be applied to deduce the $p$-Talagrand inequality in the sub-Riemannian setting of the Heisenberg group.

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