Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...238..761r&link_type=abstract
Science (ISSN 0036-8075), vol. 238, Nov. 6, 1987, p. 761-765. NSF-supported research.
Physics
66
Clocks, Neutron Stars, Pulsars, Radio Telescopes, Time Measurement, Cosmology, Gravitational Waves, Hubble Constant, Radio Frequencies, Time Signals
Scientific paper
This paper describes recent results obtained for the millisecond pulsar PSR 1937+21 using new equipment in which many instrumental deficiencies have been corrected, and a detailed analysis is presented of all results obtained since late 1982. These measurements, taken approximately every two weeks, yield estimates of fractional frequency stability that continue to improve with increasing averaging time. The pulsar's frequency stability is at least as good as 6 x 10 to the -14th for averaging times longer than four months, and over the longest intervals the measurements appear to be limited by the stability of the reference atomic clocks. The data yield a firm upper limit of 7 x 10 to the -36th g/cu cm for the energy density of a cosmic background of gravitational radiation at frequencies of about 0.23 cycle/yr. This limit corresponds to approximately 4 x 10 to the -7th of the density required to close the universe.
Allan David W.
Davis Martin
Rawley Lloyd A.
Taylor Joseph H. Jr.
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