CfA Colloquium Schedule Fall 2011
 27 October 2011

27 October 2011

Speaker: Frank van den Bosch (Yale)

Title:Precision Cosmology with a Combination of Galaxy Clustering and Galaxy-Galaxy Lensing

Abstract:In recent years much progress has been made in constraining halo occupation statistics, the statistical description of how galaxies of different properties are distributed over dark matter halos of different mass. This progress is due to (i) a dramatic increase in data in the form of galaxy redshift surveys, and (ii) the development of the Halo Model, which allows for an analytical description of the non-linear dark matter mass distribution in terms of its halo building blocks. After an introduction to the Halo Model, I present the Conditional Luminosity Function, which is a statistical tool to describe the galaxy-dark matter connection, and show how it can be constrained using either galaxy clustering or galaxy-galaxy lensing. Next, I show that a combination of these two data sets allows one to put tight constraints on cosmological parameters, in a manner that is both complementary to and compatative with other probes, such as Baryon Accoustic Oscillations, Cosmic Shear and SuperNovae Ia. Finally I present applications of this method to data from the Sloan Digital Sky Survey.


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