Testing cosmology with double source lensing
Sharma D. Collett T. Linder E.V.
1 April 2023Institute of Physics
Journal of Cosmology and Astroparticle Physics
2023#2023Issue 4
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. 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.
dark energy experiments , dark energy theory , gravitational lensing
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Department of Physics, University of California, Berkeley, 94720, CA, United States
Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX, United Kingdom
Berkeley Center for Cosmological Physics & Berkeley Lab, University of California, 1 Cyclotron Road, Berkeley, 94720, CA, United States
Energetic Cosmos Laboratory, Nazarbayev University, 53 Kabanbay Batyr Avenue Qazaqstan, Astana, 010000, Kazakhstan
Department of Physics
Institute of Cosmology and Gravitation
Berkeley Center for Cosmological Physics & Berkeley Lab
Energetic Cosmos Laboratory
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