# Gravitational lensing study of cold dark matter led galactic halo

## TL;DR

This paper models the space-time geometry of spiral galaxy halos with cold dark matter, using gravitational lensing to validate the model against observations of galaxy clusters and galaxy-galaxy lensing.

## Contribution

It introduces a new space-time model for galactic halos based on observed rotation curves and dark matter, and demonstrates its consistency with gravitational lensing data.

## Key findings

- The model explains galaxy-galaxy weak lensing observations.
- The model accounts for lensing in the Abell 370 galaxy cluster.
- The approach links galactic rotation curves with gravitational lensing phenomena.

## Abstract

In this work the space-time geometry of the halo region in spiral galaxies is obtained considering the observed flat galactic rotation curve feature, invoking the Tully-Fisher relation and assuming the presence of cold dark matter in the galaxy. The gravitational lensing analysis is performed treating the so obtained space-time as a gravitational lens. It is found that the aforementioned space-time as the gravitational lens can consistently explain the galaxy-galaxy weak gravitational lensing observations and the lensing observations of the well-known Abell 370 galaxy cluster.