Revealing the Cosmic Information in Clusters through the Sunyaev-Zeldovich Effect
J. Richard Bond

Compton upscattering of CMB photons is a direct probe of the energy of the gas in graviationally-collapsed objects ranging from the rarest clusters down to the typical groups. I will talk about our current state of SZ observations and cluster theory. In spite of the long SZ history, it has only been in the last few years that ACT and Planck teams, to which I belong, and the SPT team, have delivered impressive SZ results that show this probe is now profoundly augmenting the X-ray, optical galaxy and lensing signatures. To unravel the cosmic implications of the SZ data, the complexity of the cosmic web's cluster/group patches must be understood, and this requires a large program of gastrophysical simulations with energy/entropy feedback, with special attention to cluster outskirts as well as deep interior, whose conclusions I will describe.