Constraining the anomalous coupling of gravitational waves with the double pulsar.

Abstract

We revisit the decay of the orbital period in binary systems that occurs due to the emission of gravitational waves in the context of modifie- gravity models where the coupling Ggw between matter and on shell gravitons is allowed to differ from the Newton constant GN. Using the most precisely-timed double neutron star binary system, those of the double pulsar, we constrain the ratio Ggw=GN to the level of 10−4, improving by two orders of magnitude the present bound on this quantity.