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Hypercontractivity for log-subharmonic functions
Authors:Piotr Graczyk  Jean-Jacques Loeb
Institution:a Université d'Angers, 2 boulevard Lavoisier, 49045 Angers cedex 01, France
b 2-175, MIT 77 Massachusetts Avenue, Cambridge, MA 02139, United States
c UCSD, La Jolla, CA, United States
Abstract:We prove strong hypercontractivity (SHC) inequalities for logarithmically subharmonic functions on Rn and different classes of measures: Gaussian measures on Rn, symmetric Bernoulli and symmetric uniform probability measures on R, as well as their convolutions. Surprisingly, a slightly weaker strong hypercontractivity property holds for any symmetric measure on R. A log-Sobolev inequality (LSI) is deduced from the (SHC) for compactly supported measures on Rn, still for log-subharmonic functions. An analogous (LSI) is proved for Gaussian measures on Rn and for other measures for which we know the (SHC) holds. Our log-Sobolev inequality holds in the log-subharmonic category with a constant smaller than the one for Gaussian measure in the classical context.
Keywords:Hypercontractivity  Subharmonic  Log-Sobolev inequality
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