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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Bullet Cluster: A Challenge to Lambda-CDM Cosmology
Speaker(s): Eiichiro Komatsu
Abstract: We show that the existence of the bullet cluster, 1E0657-56, is incompatible with the prediction of the standard Lambda CDM cosmology. The probability of finding the large infall velocity (3000 km/s) necessary for explaining the X-ray and weak lensing data of 1E0657-56 is between 3.3x10^{-11} and 3.6x10^{-9}. The existence of the bullet cluster poses a serious challenge to LCDM cosmology, unless a lower infall velocity solution for 1E0657-56 with <1800 km/s is found.
Date: 29/04/2010 - 11:00 am
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