Talk detail

Participant	Reverdy, Vincent
Institution	University of Illinois at Urbana-Champaign, Department of Astronomy - 1002 West Green Street - Urbana - Illinois - USA

Session	DE2	Accepted		Order	Time
Talk	Oral abstract	Title	Light Propagation Through Cosmic Structures: Results From Cosmological Simulations
Coauthors
Abstract	The anomaly of the apparent acceleration of expansion of the Universe requires going beyond the concordance paradigm of cosmology. In this context, the backreaction conjecture brings an elegant solution. But if we know that inhomogeneities have an effect on the local expansion rate, the global amplitude of these effects remains largely unknown. Quantifying these effects will require inputs from theory, observations and numerical simulations. In this talk, I will present results of relativistic raytracing in the weak-field approximation in cosmological simulations. Null geodesics have been integrated up to a redshift of 30 for several virtual observers in the Dark Energy Universe Simulation: Full Universe Run. I will discuss how inhomogeneities affect the propagation of light on cosmological scales and how the angular diameter distance and the luminosity distance are affected by these effects. I will also provide outlooks for the future of numerical simulations of inhomogeneous cosmologies aiming at quantifying backreaction effects in the long run.
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