Sharp weighted Sobolev and Gagliardo–Nirenberg inequalities on half‐spaces via mass transport and consequences

By Van Hoang Nguyen. 2013

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By adapting the mass transportation technique of Cordero‐Erausquin, Nazaret and Villani, we obtain a family of sharp Sobolev and Gagliardo–Nirenberg (GN) inequalities on the half‐space Rn−1×R+ , n⩾1 equipped with the weight ω(x)=xna , a⩾0 . It amounts to work with the fractional dimension na=n+a . The extremal functions in the weighted Sobolev inequalities are fully characterized. Using a dimension reduction argument and the weighted Sobolev inequalities, we can reproduce a subfamily of the sharp GN inequalities on the Euclidean space due to Del Pino and Dolbeault, and obtain some new sharp GN inequalities as well. Our weighted inequalities are also extended to the domain Rn−m×R+m and the weights are ω(x,t)=t1a1⋯tmam , where n⩾m , m⩾0 and a1,…,am⩾0 . A weighted Lp ‐logarithmic Sobolev inequality is derived from these inequalities.

Subfields: Applied Mathematics, Mathematical Physics

View Paper: https://www.semanticscholar.org/paper/176c60d9576eb0c3b144520dfe58d755c4aef227