Gravitation

LIGO and VIRGO scientific collaboration has published the first catalogue of black hole binaries
detected during the first and second observational runs. In total 10 systems systems were reported
as high confidence events. During the third observing run, the numbers of detected binaries is already
above 40 and growing.

Those or similar systems should be also observed with the future space-based gravitational wave (GW)
observatory LISA. However while the ground-based detectors see the signal only less than a second

Context:
The context of this PhD is the study of different aspects in late-time cosmology and gravity in the context of ground-based detectors such as LIGO and Virgo and in particular future 3rd generation detectors such as Einstein telescope (ET).