July 7, 2025 to August 1, 2025
Ecole de Physique des Houches
Europe/Paris timezone

Line-of-sight effects in strong lensing cosmology

Jul 10, 2025, 5:15 PM
25m
Ecole de Physique des Houches

Ecole de Physique des Houches

École de physique des Houches 149 Chem. de la Côté, 74310 Les Houches

Speaker

Daniel Johnson

Description

Inhomogeneities in the distribution of matter in the universe distort strong lens images, complicating cosmological constraints. However, they also leave a potentially measurable imprint on strong lens images. In the last decade, strong lensing has been proposed as a novel probe of cosmic shear, and thus the matter power spectrum. I will present the current status of this work: the interpretation of the line-of-sight shear, the reasons to believe this signal can be reliably measured with current and upcoming survey telescopes, the lens modelling challenges which remain as obstacles, and the anticipated power of this technique in obtaining cosmological constraints.

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