Bilinear decompositions for the product space $H^1_L\times BMO_L$

Details Bilinear decompositions for the product space $H^1_L\times BMO_L$ Bilinear decompositions for the product space $H^1_L\times BMO_L$

2012-04-13

arxiv.org/abs/1204.3041v1

Mathematics

Classical Analysis and ODEs

Scientific paper

In this paper, we improve a recent result by Li and Peng on products of functions in $H_L^1(\bR^d)$ and $BMO_L(\bR^d)$, where $L=-\Delta+V$ is a Schr\"odinger operator with $V$ satisfying an appropriate reverse H\"older inequality. More precisely, we prove that such products may be written as the sum of two continuous bilinear operators, one from $H_L^1(\bR^d)\times BMO_L(\bR^d) $ into $L^1(\bR^d)$, the other one from $H^1_L(\bR^d)\times BMO_L(\bR^d) $ into $H^{\log}(\bR^d)$, where the space $H^{\log}(\bR^d)$ is the set of distributions $f$ whose grand maximal function $\mathfrak Mf$ satisfies $$\int_{\mathbb R^d} \frac {|\mathfrak M f(x)|}{\log (e+ |\mathfrak Mf(x)|)+ \log(e+|x|)}dx <\infty.$$

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