Strong-field tests of relativistic gravity and binary pulsars

Details Strong-field tests of relativistic gravity and binary pulsars Strong-field tests of relativistic gravity and binary pulsars

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9219818d&link_type=abstract

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Binary Stars, Gravitation Theory, Invariance, Kepler Laws, Parameterization, Pulsars, Relativistic Effects, Computational Astrophysics, Formalism, Phenomenology, Relativistic Theory, Time Measurement

Scientific paper

Observations of pulsars in gravitationally bound binary systems provide a unique opportunity for testing the strong-field regime of relativistic gravity. The authors present a detailed account of the 'parameterized post-Keplerian' (PPK) formalism, a general phenomenological framework designed to extract the maximum possible information from pulsar timing and pulse-structure data. The PPK approach allows dynamical information to be obtained from the data in a theory-independent way, and encoded in a certain number of fitted post-Keplerian parameters. The authors show that as many as 19 such parameters can be measured, under favorable conditions, giving access to 15 possible tests of relativistic gravity. The authors isolate and quantify the theoretical content of these tests by deriving, within the framework of generic boost-invariant theories, expressions linking the phenomenological parameters to the inertial masses of the pulsar and its companion, and to the polar angles of the spin axis of the pulsar. The prospects for extracting some of these tests from observations of known or yet-to-be-discovered binary pulsars is quantitatively assessed through numerical simulations.

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