Constraining Scalar-Tensor Modified Gravity with Gravitational Waves and Large Scale Structure Surveys

Understand

The first multi-messenger gravitational wave event has had a transformative effect on the space of modified gravity models.

• In this paper we study the enhanced tests of gravity that are possible with a future set of gravitational wave standard siren events.
• We perform MCMC constraint forecasts for parameters in Horndeski scalar-tensor theories.
• In particular, we focus on the complementarity of gravitational waves with electromagnetic large-scale structure data from galaxy surveys.