Physics – Atomic Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..233..540t&link_type=abstract
Atomic physics 12. AIP Conference Proceedings, Volume 233, pp. 540-548 (1991).
Physics
Atomic Physics
Pulsars, Neutron Stars, Relativity And Gravitation
Scientific paper
Radio pulsars provide unique opportunities for precision measurments of gravitational phenomena, including instances where relativistically strong fields are known to be important. In this paper I summarize the status of two continuing experiments involving detailed investigation of the gravitational interactions between a pulsar and its orbiting companion. One experiment yields high-accuracy mass measurements for two neutron stars, and a quantitative test which proves with better than 1% precision-that a gravitationally bound binary system loses energy at the rate expected from gravitational radiation. The second experiment, involving a different binary pulsar, allows measurement of two parameter characterizing the general relativistic ``Shapiro delay'' in the system, and from these the masses of the pulsar and its white dwarf companion. The neutron star masses are especially valuable because they help to provide an experimental foundation for theoretical work on the last stages of stellar evolution. Both experiments also yield rigorous limits on the rate of change of Newton's constnat, G. The limits are presently at the level of parts in 1011 per year, and prospects for further improvement are excellent.
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