Cours de l'IAP / Lectures of the IAP |
| « Gravitational lensing, from planets to clusters of galaxies 1 » |
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Christophe Alard |
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Gravitational lensing is a very active and highly developed field in astrophysics. The new developments in this field include among many other applications the detection of planets around stars or the lensing by cosmological large scale structures. The dramatic difference in scale in the modern applications of gravitational lensing illustrates the richness of this field but also its complexity. Despite this apparent complexity there are universal aspects in all the applications of gravitational lensing and this course will present this field in an unified manner.
The presentation will start with the simplest application which is the lensing of a stellar object by a single massive star. Then the presentation will proceed with the microlensing projects and the perturbations due to planets around stars. This first part will be the occasion to introduce fundamental aspects of gravitational lensing. The course will then proceed with cosmological applications like the lensing of quasars, the formation of gravitational arcs and a general theoretical approach of strong gravitational lensing. The course will conclude with a general presentation of the weak lensing regime and its applications. This course will be illustrated with practical applications and will propose some numerical projects of increasing complexity in order to provide an in depth understanding of gravitational lensing. Full program at http://www2.iap.fr/users/alard/cours_lensing.pdf Slides of the first lecture : http://www2.iap.fr/users/alard/cours_lensing/cours1.pdf ***************************************** Lecture 1: General presentation of the course 1.1) The various applications of gravitational lensing at different scales 1.1.1) Lensing at the stellar scale 1.1.2) Lensing at the galaxy scale, strong lensing: arcs, galaxy/galaxy lensing 1.1.3) Clusters of galaxies, weak lensing reconstruction of mass, strong lensing: arcs 1.1.4) Gravitational lensing in cosmology 1.2) The various lensing regimes 1.2.1) Strong lensing 1.2.2) Weak lensing 1.2.3) Intermediate regime 1.2.4) Illustrations |
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lundi 10 janvier 2022 - 15:00 Amphithéâtre Henri Mineur, Institut d'Astrophysique |
| Page web des cours / Lectures' webpage |