Line-of-sight effects in gravitational lensing
Abstract
This talk will present a new, unifying formalism to describe the gravitational lensing by many lensing events along the line-of-sight to a distant source. This formalism will then be applied to the case of a strong lensing event modified by a collection of weak perturbers to illustrate how the well-known properties of large-scale weak lensing might allow one to lift some degeneracies in the reconstruction of the lens mass-profile. This may be of importance in the quest to an accurate way of using gravitational lensing to measure properties of the Universe on large scales, such as the Hubble constant. Finally, we will also show that the formalism may be used the other way around, i.e. by using strong lensing events to extract information on cosmic weak lensing.
- Publication:
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AFAS2 2021: Conference of the African Astronomical Society
- Pub Date:
- March 2021
- Bibcode:
- 2021afas.confE..39L