Shape and geometry of galaxy clusters and the SZ effect
  We discuss the influence of the finite extension and the geometry of clusters of galaxies, as well as of the polytropic temperature profile, on the determination of the Hubble constant. 
L. Grenacher, R. Piffaretti, D. Puy (PSI, Univ. Zurich), Ph. Jetzer   (ETH Zurich, Univ. Zurich), M. Signore (Obs. Paris)