Testing cosmology with double source lensing

Journal Article · 03 April 2023 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2023/04/001 · OSTI ID:2228503

Sharma, Divij ^[1]; Collett, Thomas E. ^[2]; Linder, Eric V. ^[3]

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1. University of California, Berkeley, CA (United States)
2. University of Portsmouth (United Kingdom)
3. University of California, Berkeley, CA (United States); Nazarbayev University, Astana (Kazakhstan)

Double source lensing provides a dimensionless ratio of distance ratios, a "remote viewing" of cosmology through distances relative to the gravitational lens, beyond the observer. We use this to test the cosmological framework, particularly with respect to spatial curvature and the distance duality relation. We derive a consistency equation for constant spatial curvature, allowing not only the investigation of flat vs curved but of the Friedmann-Lemaître-Robertson-Walker framework itself. For distance duality, we demonstrate that the evolution of the lens mass profile slope must be controlled to ≳ 5 times tighter fractional precision than a claimed distance duality violation. Furthermore, using LensPop forecasts of double source lensing systems in Euclid and LSST surveys we also explore constraints on dark energy equation of state parameters and any evolution of the lens mass profile slope.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); National Aeronautics and Space Administration (NASA); European Research Council (ERC)
• Grant/Contract Number: AC02-05CH11231; 945536; 12-EUCLID12-0004
• OSTI ID: 2228503
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2023, Issue 04; ISSN 1475-7516
• Publisher: Institute of Physics (IOP)Copyright Statement
• Country of Publication: United States
• Language: English