Testing cosmology with double source lensing

Divij Sharma

doi:10.1088/1475-7516/2023/04/001

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Testing cosmology with double source lensing

2023-04-03

Divij Sharma *

Thomas E. Collett

Eric V. Linder

DOI：10.1088/1475-7516/2023/04/001

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Abstract

En 中文

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-Lemaitre-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.

Keywords:

gravitational lensing

dark energy theory

dark energy experiments

Journal

Journal of Cosmology and Astroparticle Physics

IF:

5.9

Papers:

1.3W

Citations:

4.7W

Organization

University of California Berkeley

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