Extended Kato inequalities for conformal operators

Abstract

We prove, for a class of first order differential operators containing the generalized gradients, Dirac and Penrose twistor operators, a family of Kato inequalities that interpolates between the classical and the refined Kato. For the Hodge-de-Rham operator we get a more detailed result. As a corollary, we get various Kato inequalities from the literature.

version 2, corrected a misstatement and some typos, added in references, to appear as a slightly shorter version in Proc. of AMS