American radio astronomer and physicist who, with Russell A. Hulse,
was the corecipient of the 1993 Nobel Prize for Physics for their joint
discovery of the first binary pulsar.
Taylor and Hulse conducted their prizewinning research on pulsars while Taylor was a professor at Amherst and Hulse was his graduate student. In 1974, using the large radio telescope at Arecibo, Puerto Rico, they discovered a pulsar (a rapidly spinning neutron star) emitting radio pulses at intervals that varied in a regular pattern, decreasing and increasing over an eight-hour period. They concluded from these signals that the pulsar must be alternately moving toward and away from the Earth--i.e., that it must be orbiting around a companion star, which the two men deduced was also a neutron star.
Their discovery of the first binary pulsar, PSR 1913 + 16, provided an unprecedented test of Albert Einstein's theory of gravitation, which, according to the general theory of relativity, predicts that objects accelerated in a strong gravitational field will emit radiation in the form of gravitational waves. With its enormous interacting gravitational fields, the binary pulsar should emit such waves, and the resulting energy drain should reduce the orbital distance between the two stars. This could in turn be measured by a slight, gradual reduction in the timing of the pulsar's distinctive radio emissions.
Taylor and Hulse timed PSR 1913 + 16's pulses over the next few years
and showed that the two stars are indeed rotating ever faster around
each other in an increasingly tight orbit, with an annual decrease of
about 75 millionths of a second in their eight-hour orbital period.
The rate at which the two stars are spiraling closer together was found
to agree with the prediction of the theory of general relativity to
an accuracy of better than 0.5 percent. This finding, reported in 1978,
provided the first experimental evidence for the existence of gravitational
waves and gave powerful support to Einstein's theory of gravity. In
the following years, Taylor continued making careful measurements of
the orbital period of PSR 1913 + 16, and his research group went on
to discover several other binary pulsars.
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