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We have conducted fully relativistic simulations in a class of scalar-tensortheories with derivative self-interactions and screening of local scales. Byusing high-resolution shock-capturing methods and a non-vanishing shift vector,we have managed to avoid issues plaguing similar attempts in the past. We havefirst confirmed recent results by ourselves in spherical symmetry, obtainedwith an approximate approach and pointing at a partial breakdown of thescreening in black-hole collapse. Then, we considered the late inspiral andmerger of binary neutron stars. We found that screening tends to suppress the(subdominant) dipole scalar emission, but not the (dominant) quadrupole scalarmode. Our results point at quadrupole scalar signals as large as (or evenlarger than) in Fierz-Jordan-Brans-Dicke theories with the same conformalcoupling, for strong-coupling scales in the MeV range that we can simulate.

No evidence of kinetic screening in simulations of merging binary neutron stars beyond general relativity