Tidal Deformability of Neutron Stars in Scalar Tensor Theories of Gravitation

Gravitational waves from compact binary coalescence are valuable for testing theories of gravity in the strong field regime.  Gravitational waves from binary neutron stars also lead to stringent constraints on the equation of state of matter at extreme densities.  In this work, we explicitly calculate the fully relativistic l ≥ 2 tidal love numbers for neutron stars in scalar tensor theories of gravitation.  Combined with a family of  nuclear equations of state based on chiral effective field theory,  we explore how the mass, radius, and tidal deformability relations differ from those of general relativity.  We aim to apply this to the binary neutron star merger event GW170817 in order to obtain observational constraints on neutron star radius in these modified theories of gravity.