Clusters in preheating simulation and its effect on CMB spectrum

We report an instantaneous heating scheme at z = 2 that can produce bound objects obeying the observed mass-temperature and luminosity-temperature relations. Such heating reduces the Sunyaev-Zeldovich (SZ) flux by a factor 3 - 2 on scale of 4 - 6 arcminutes. It exacerbates the need for the matter-fluctuation normalization as to assume an exceedingly high value (∼ 1.2), if the several-arcminute excess anisotropy detected by the CBI experiment is entirely caused by the SZ effect of inter-galactic hot gas. By contrast, we find that the several-arcminute excess detected by ACBAR can be consistent with the preheated SZ signals of σ8 = 1.