Cosmic gravitational-wave background - Limits from millisecond pulsar timing

Details Cosmic gravitational-wave background - Limits from millisecond pulsar timing Cosmic gravitational-wave background - Limits from millisecond pulsar timing

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvl..65..285s&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 65, July 16, 1990, p. 285-288. Research supported by NIST and Corning Glass Works

Physics

101

Cosmic Noise, Gravitational Waves, Pulsars, Pulse Duration, Interstellar Matter, Stellar Spectra

Scientific paper

Seven years of millisecond pulsar-timing data are used to derive rigorous upper bounds on a cosmic gravitational-wave background. The energy density per logarithmic frequency interval near f = 0.14/yr must be less than 9 x 10 to the -8th (68 pct confidence), or less than 4 x 10 to the -7th (95 pct confidence), of the density required to close the universe. A red-noise signal is detected in the residuals for one pulsar. Its spectrum appears flatter than the f exp -5 power law expected for a gravity-wave background. Likely noise sources include changes in the interstellar medium and pulsar rotational instabilities.

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