Tuesday, August 3, 2010 - 3:00pm
Satej Khedekar (TIFR Mumbai):
"Constraining cosmology with galaxy clusters -- wedding cakes & rulers."
Abstract. Ongoing Sunyaev-Zel'dovich (SZ) cluster surveys like the ACT, SPT and Planck have the potential of revealing the nature of dark energy using cluster number count observations. However, the cluster yields in these surveys have been a factor of 4 to 5 lower than what had been anticipated earlier. With such low cluster detections, the cosmological constraints would be washed out due to the infamous cosmology-cluster physics degeneracy. In this context, we discuss two new ideas to significantly improve the constraints on dark energy.