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Extremal values of the (fractional) Weinstein functional on the hyperbolic space

  • Mayukh Mukherjee EMAIL logo
Veröffentlicht/Copyright: 16. September 2016

Abstract

We study Weinstein functionals, first defined in [33], mainly on the hyperbolic space n. We are primarily interested in the existence of Weinstein functional maximizers or, in other words, existence of extremal functions for the best constant of the Gagliardo–Nirenberg inequality. The main result is that the supremum of the Weinstein functional on n is the same as that on n and the related fact that the said supremum is not attained on n, when functions are chosen from the Sobolev space H1(n). This proves a conjecture made in [8] (see also [3]). We also prove an analogous version of the conjecture for the Weinstein functional defined with the fractional Laplacian.

MSC 2010: 35J61; 35H20

Communicated by Christopher D. Sogge


Award Identifier / Grant number: DMS-1161620

Funding statement: The author was partially supported by NSF grant DMS-1161620.

Acknowledgements

This project was completed when I was a Ph.D. student at UNC Chapel Hill under the guidance of Michael E. Taylor. I wish to thank Jeremy Marzuola for going through a draft copy of this write-up and making several important suggestions, and also for teaching me about the fractional G-N inequality. I wish to thank the anonymous referee for her/his valuable advice.

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Received: 2015-2-17
Revised: 2016-8-14
Published Online: 2016-9-16
Published in Print: 2017-7-1

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