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Rupert Frank

2011-01-11
10:00:00 - 10:55:00

R102 , Astronomy and Mathematics Building

We derive the sharp constants for the inequalities on the Heisenberg group H^n whose analogues on Euclidean space R^n are the well known Hardy-Littlewood-Sobolev inequalities. Only one special case had been known previously, due to Jerison-Lee more than twenty years ago. From these inequalities we obtain the sharp constants for their duals, which are the Sobolev inequalities for the Laplacian and conformally invariant fractional Laplacians. By considering limiting cases of these inequalities sharp constants for the analogues of the Onofri and log-Sobolev inequalities on H^n are obtained. The methodology is completely different from that used to obtain the R^n inequalities and can be used to give a new, rearrangement free, proof of the HLS inequalities. (This talk is based on joint work with E. Lieb.)

For material related to this talk, click here.