Testing Cosmology with Double Source Lensing

Abstract

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 $\gtrsim 5$ 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.

arXiv comment10 pages, 7 figures. v2 matches version accepted to JCAP

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Cited by in corpus (7)

• Euclid. I. Overview of the Euclid mission
• Scalar field dark energy models: Current and forecast constraints
• Strong Lensing by Galaxies
• J1721+8842: The first Einstein zig-zag lens
• Constraining Cosmology with Double-source-plane Strong Gravitational Lenses from the AGEL Survey
• Line-of-sight effects on double source plane lenses
• A compact group lens modeled with GIGA-Lens: Enhanced inference for complex systems