Weighted norm inequalities, off-diagonal estimates and elliptic operators

Details Weighted norm inequalities, off-diagonal estimates and elliptic operators Weighted norm inequalities, off-diagonal estimates and elliptic operators

2008-10-17

arxiv.org/abs/0810.3073v1

Mathematics

Classical Analysis and ODEs

survey for the El Escorial 2008 proceedings

Scientific paper

We give an overview of the generalized Calder\'on-Zygmund theory for "non-integral" singular operators, that is, operators without kernels bounds but appropriate off-diagonal estimates. This theory is powerful enough to obtain weighted estimates for such operators and their commutators with $\BMO$ functions. $L^p-L^q$ off-diagonal estimates when $p\le q$ play an important role and we present them. They are particularly well suited to the semigroups generated by second order elliptic operators and the range of exponents $(p,q)$ rules the $L^p$ theory for many operators constructed from the semigroup and its gradient. Such applications are summarized.

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