Subgaussian 1-cocycles on discrete groups

12 Jun 2015  ·  Junge Marius, Zeng Qiang ·

We prove the $L_p$ Poincar\'e inequalities with constant $C\sqrt{p}$ for $1$-cocycles on countable discrete groups under Bakry--Emery's $\Gamma_2$-criterion. These inequalities determine an analogue of subgaussian behavior for 1-cocycles... Our theorem improves some of our previous results in this direction, and in particular implies Efraim and Lust-Piquard's Poincar\'e type inequalities for the Walsh system. The key new ingredient in our proof is a decoupling argument. As complementary results, we also show that the spectral gap inequality implies the $L_p$ Poincar\'e inequalities with constant $C{p}$ under some conditions in the noncommutative setting. New examples which satisfy the $\Gamma_2$-criterion are provided as well. read more

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Probability Group Theory Operator Algebras