# Amaldi Research Center Summer School

Sep 5 – 9, 2022
Paestum
Europe/Rome timezone

## Constraints on Compact Dark Matter from Gravitational-Wave Microlensing

Not scheduled
20m
Paestum

#### Paestum

Hotel Ariston Via Laura, 13, 84047 Paestum SA

### Speaker

Mr Soummyadip Basak (ICTS-TIFR, Bangalore, India)

### Description

If a significant fraction of dark matter is in the form of compact objects, they will cause microlensing effects in the gravitational-wave signals observable by LIGO and Virgo. From the nonobservation of microlensing signatures in the binary black hole events from the first two observing runs and the first half of the third observing run, we constrain the fraction of compact dark matter in the mass range $10^2 –10^5 \mathrm{M_\odot}$ to be less than 50%–80% (details depend on the assumed source population properties and the Bayesian priors). These modest constraints will be significantly improved in the next few years with the expected detection of thousands of binary black hole events, providing a new avenue to probe the nature of dark matter.

### Primary authors

Dr Ajit Mehta (ICTS-TIFR, Bangalore, India; Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Potsdam, Germany) Dr Apratim Ganguly (ICTS-TIFR, Bangalore, India; IUCAA, Pune, India) Mr Soummyadip Basak (ICTS-TIFR, Bangalore, India) Prof. Ajith P (ICTS-TIFR, Bangalore, India; Canadian Institute for Advanced Research, CIFAR Azrieli Global Scholar, Toronto, Canada) Dr Haris K (ICTS-TIFR, Bangalore, India; Nikhef, Amsterdam, The Netherlands; Institute for Gravitational and Subatomic Physics (GRASP), Utrecht, The Netherlands) Prof. Shasvath Kapadia (ICTS-TIFR, Bangalore, India; IUCAA, Pune, India)

### Presentation materials

There are no materials yet.