Speaker
Description
In general relativity inhomogeneities generically produce differential cosmic expansion which is not equivalent to a homogeneous isotropic cosmology plus local boosts, as assumed in the current standard model. We present the first ray tracing simulations of local structure that exhibit this, using exact solutions of Einstein's equations constrained by both actual large galaxy surveys (the COMPOSITE sample) and the Cosmic Microwave Background. We use exact Szekeres solutions on small scales which asymptote to a Planck-satellite normalized FLRW model on scales >100/h Mpc. We discuss the impact on issues including the local and global values of the Hubble constant, and large angle CMB anomalies.
Reference: K. Bolejko, M.A. Nazer and D.L. Wiltshire, JCAP 06(2016)035