Semigroups of Composition Operators on Hardy Spaces of the half-plane
  We identify the semigroups consisting of bounded composition operators on the Hardy spaces $H^p(\U)$ of the upper half-plane. We show that any such semigroup is strongly continuous on $H^p(\U)$ but not uniformly continuous and we identify the infinitesimal generator. 
Athanasios G. Arvanitidis
math.FA math.CV