Light propagation through cosmic structures using cosmological simulations

Abstract : We discuss numerical investigations of the effects of cosmological inhomogeneities on light propagation. A new algorithm directly integrating the geodesics equations has been developed and has been run on very large scale cosmological simulations up to a redshift of z = 30. Comparisons have been made for several dark energy models and for several observers, revealing percent-level discrepancies between the angular diameter distance interpreted in a friedmannian background, and the angular diameter distance computed from geodesics integration. Here, we focus on the methodology that has been deployed to obtain quantitative results in cosmological simulations.
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Communication dans un congrès
14th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories, Jul 2015, Rome, Italy. 3, pp.2302-2307, 2017, 〈10.1142/9789813226609_0266〉
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https://hal.archives-ouvertes.fr/hal-01669852
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Soumis le : jeudi 21 décembre 2017 - 01:10:53
Dernière modification le : mardi 29 mai 2018 - 12:50:20

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Vincent Reverdy, Jean-Michel Alimi, Yann Rasera. Light propagation through cosmic structures using cosmological simulations. 14th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories, Jul 2015, Rome, Italy. 3, pp.2302-2307, 2017, 〈10.1142/9789813226609_0266〉. 〈hal-01669852〉

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