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Euclid: Forecast constraints on the cosmic distance duality relation with complementary external probes

Martinelli, M; Martins, CJAP; Nesseris, S; Sapone, D; Tutusaus, I; Avgoustidis, A; Camera, S; ... Zacchei, A; + view all (2020) Euclid: Forecast constraints on the cosmic distance duality relation with complementary external probes. Astronomy & Astrophysics , 644 , Article A80. 10.1051/0004-6361/202039078. Green open access

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Abstract

Context. In metric theories of gravity with photon number conservation, the luminosity and angular diameter distances are related via the Etherington relation, also known as the distance duality relation (DDR). A violation of this relation would rule out the standard cosmological paradigm and point to the presence of new physics. Aims. We quantify the ability of Euclid, in combination with contemporary surveys, to improve the current constraints on deviations from the DDR in the redshift range 0 < z < 1.6. Methods. We start with an analysis of the latest available data, improving previously reported constraints by a factor of 2.5. We then present a detailed analysis of simulated Euclid and external data products, using both standard parametric methods (relying on phenomenological descriptions of possible DDR violations) and a machine learning reconstruction using genetic algorithms. Results. We find that for parametric methods Euclid can (in combination with external probes) improve current constraints by approximately a factor of six, while for non-parametric methods Euclid can improve current constraints by a factor of three. Conclusions. Our results highlight the importance of surveys like Euclid in accurately testing the pillars of the current cosmological paradigm and constraining physics beyond the standard cosmological model.

Type: Article
Title: Euclid: Forecast constraints on the cosmic distance duality relation with complementary external probes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202039078
Publisher version: http://dx.doi.org/10.1051/0004-6361/202039078
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: cosmology: observations, cosmological parameters, surveys, methods: data analysis, methods: statistical, space vehicles: instruments, BARYON ACOUSTIC-OSCILLATIONS, MICROWAVE BACKGROUND TEMPERATURE, INTERGALACTIC DUST, REDSHIFT, COSMOLOGY, EXPANSION, GALAXIES, SAMPLE, SCALE
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10118227
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