Abstract
General relativity predicts that energy and momentum conservation laws hold and that preferred frames do not exist. The parametrized post-Newtonian formalism phenomenologically quantifies possible deviations from general relativity. The parametrized post-Newtonian parameter (which identically vanishes in general relativity) plays a dual role in that it is associated both with a violation of the momentum conservation law and with the existence of a preferred frame. By considering the effects of in certain binary pulsar systems, it is shown that (90% CL). This limit improves on previous results by several orders of magnitude, and shows that pulsar tests of rank (together with Hughes - Drever-type tests) among the most precise null experiments of physics.
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