Double source lensing probing high redshift cosmology
Sharma D. Linder E.V.
1 July 2022Institute of Physics
Journal of Cosmology and Astroparticle Physics
2022#2022Issue 7
Double source lensing, with two sources lensed by the same foreground galaxy, involves the distance between each source and the lens and hence is a probe of the universe away from the observer. The double source distance ratio also reduces sensitivity to the lens model and has good complementarity with standard distance probes. We show that using this technique at high redshifts z > 1, to be enabled by data from the Euclid satellite and other surveys, can give insights on dark energy, both in terms of w 0-w a and redshift binned density. We find a dark energy figure of merit of 245 from combination of 256 double source systems with moderate quality cosmic microwave background and supernova data. Using instead five redshift bins between z = 1.1-5, we could detect the dark energy density out to z ≈ 5, or make measurements ranging between 31σ and 2.5σ of its values in the bins.
dark energy experiments , dark energy theory , gravitational lensing
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Department of Physics, University of California, Berkeley, 94720, CA, United States
Berkeley Center for Cosmological Physics, Berkeley Lab, University of California, Berkeley, 94720, CA, United States
Energetic Cosmos Laboratory, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Department of Physics
Berkeley Center for Cosmological Physics
Energetic Cosmos Laboratory
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