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

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 at the presence of new physics. 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

Keywords:

• Angular diameter
• Genetic algorithm
• Astrophysics
• Physics beyond the Standard Model
• Lambda-CDM model
• Photon
• COSMIC cancer database
• Algorithm
• Luminosity
• Redshift
• Physics

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