Timing the PSR J2016+1947 Binary System:. Testing the Fundamental Assumption of General Relativity

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Pulsars, and in particular pulsars in binary systems, have been used over the last 25 years to test some of the most fundamental predictions of gravitational theories. A good example was the precise measurement, by Russel Hulse and Joseph Taylor, at the Arecibo Observatory, of the motion of PSR B1913+16, a member of a double neutron-star system. These measurements showed that gravitational waves are not mere theoretical artifacts, and helped to confirm General Relativity as a valid theory of gravitation. An even more fundamental prediction of this theory is the Strong Equivalence Principle (SEP). This states that two objects under the influence of the same gravitational field will always have the same acceleration, independent of their peculiar chemical compositions and gravitational binding energies. In this work, we describe how the measurement of the motion of the PSR J2016+1947 binary system (now being undertaken at Arecibo) can be used to place stringent constraints on SEP violation. These limits can be used to test alternative theories of gravitation, specially the bi-tensor bi-scalar theories, which are among the very few viable alternatives to General Relativity.

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