# Weak Gravitational Lensing

**Authors:** Peter Schneider  
**arXiv:** [astro-ph/0509252](https://arxiv.org/abs/astro-ph/0509252)  
**Date:** 2005-09-09  
**Summary page:** https://www.summarizepaper.com/en/arxiv-id/astro-ph--0509252v1/

## Key points

- Introduction: Weak gravitational lensing and its significance in studying galaxies and large-scale structures
- Principles of weak gravitational lensing: Distortion of light by intervening mass distributions
- Observational issues and challenges in weak lensing studies
- Clusters of galaxies: Introduction and strong gravitational lensing effects
- Mass reconstructions from weak lensing observations
- Cosmic shear - lensing by the Large-Scale Structure (LSS)
- Recent observational results on large-scale structure lensing
- The mass properties of individual galaxies and their connection to dark matter halos

## Summary

This review, written by Peter Schneider, is a part of the Saas-Fee Advanced Course on Gravitational Lensing and focuses specifically on Weak Gravitational Lensing. The review provides a comprehensive overview of the basics, applications, and results of weak lensing. The contents of the review are as follows: 

1. Introduction: This section introduces the concept of weak gravitational lensing and its significance in studying the properties of galaxies and large-scale structures in the universe. 2. The principles of weak gravitational lensing: Here, the fundamental principles underlying weak gravitational lensing are explained. This includes how light from distant objects gets distorted by intervening mass distributions and how this distortion can be used to infer information about the distribution of matter in the universe. 3. Observational issues and challenges: This section discusses various observational challenges faced in weak lensing studies, such as measuring small distortions in galaxy shapes accurately and dealing with systematic errors. 4. Clusters of galaxies: Introduction, and strong lensing: The review delves into clusters of galaxies, providing an introduction to their properties and discussing strong gravitational lensing effects that occur within these massive structures. 5. Mass reconstructions from weak lensing: This section focuses on techniques used to reconstruct mass distributions from weak gravitational lensing observations. It explores both theoretical methods and practical considerations involved in obtaining reliable mass maps. 6. Cosmic shear - lensing by the Large-Scale Structure (LSS): Cosmic shear refers to the coherent distortion patterns observed in large-scale structures due to weak gravitational lensing. This section explores cosmic shear measurements and their implications for understanding dark matter distribution on cosmological scales. 7. Large-scale structure lensing: results: Here, recent observational results related to large-scale structure lensing are presented, highlighting key findings regarding cosmic web filaments, voids, and other structural features. 8. The mass of galaxies and associated with galaxies: This section investigates the mass properties of individual galaxies and their connection to the surrounding dark matter halos.