Talk detail

Participant	Bolejko, Krzysztof
Institution	The University of Sydney - School of Physics A28 - Sydney - NSW - Australia

Session	DE2	Accepted	Yes	Order	8P	Time	16:45	25'
Talk	Oral abstract	Title	Exact Inhomogeneous Dust Solutions And Backreaction
Coauthors
Abstract	I my talk I will discuss properties of exact inhomogeneous cosmological models in relation to backreaction. Using several examples I will show how exact perturbations affect evolution of matter (density and expansion) and light propagation. I will also discuss how the presence of inhomogeneities affects the large scale averages. I will discuss, within the context of exact solutions of the Einstein equations, the conditions that lead to negligibly small backreaction, as well as the conditions that potentially could lead to large backreaction.
Pdf file

Session	DE3	Accepted	Yes	Order	5	Time	15:45	15'
Talk	Oral abstract	Title	Local Inhomogeneous Cosmological Environment And Its Impact On Cosmological Observations
Coauthors	Wiltshire, David; Nazer, Ahsan
Abstract	The Universe on scales of ~100 Mpc consists of structures such as voids, galaxy clusters, filaments and superclusters. The presence of these inhomogeneities leaves imprints in form of additional anisotropies in the Cosmic Microwave Background (CMB) radiation and in the Hubble flow. During my talk I will discuss how local inhomogeneities, modelled using exact inhomogeneous solutions of the Einstein equations, affect the Hubble flow and CMB anisotropies. I will show that part of the anisotropies of the CMB and Hubble flow, in particular the dipole and quadrupole, can be of non-kinematic origin, and could be induced by cosmic structures within 100-200 Mpc.
Pdf file