Joint multi-order tests of strong field gravitation with double neutron star observations

Binary systems containing two neutron stars present unique opportunities to test our understanding of General Relativity (GR) as the preferred theory of gravitation in the strong-field regime. Additionally, as double neutron star systems can be observed using both radio and gravitational waves, the complementarity in constraining power from such observations allow for simultaneous tests of GR at several parametrized orders away from the baseline GR dynamics.

I will present an analysis combining post-Newtonian constraints from radio observations of PSR J0737–3039A/B with the set of Binary Neutron Star coalescences observed in gravitational waves. I will explore constraints and correlations amongst the first four post-Newtonian orders, with a particular focus on the impact on model systematics and implications for alternate theories of gravitation.