Multipliers and imaginary powers of the schrödinger operators characterizing UMD Banach spaces
arXiv:1109.0429
Abstract
In this paper we establish -boundedness properties for Laplace type transform spectral multipliers associated with the Schrödinger operator . We obtain for this type of multipliers pointwise representation as principal value integral operators. We also characterize the UMD Banach spaces in terms of the -boundedness of the imaginary powers , , of .