Pulsar Timing Arrays Can Measure Gravitational Wave Source Distance

Mathematics – Logic

Scientific paper

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Scientific paper

Gravitation waves manifest themselves as a tidal acceleration; correspondingly, gravitational wave detectors must be analyzed as (space-time) extended systems interacting with a (space-time) extended wave. In the case of pulsar timing arrays the detector size is of order the pulsar-Earth distance, which is in excess of 1 Kpc for over half the pulsars in the International Pulsar Timing Array (IPTA). For a gravitational wave point source the radiation wavefront curvature, associated with the finite source-Earth distance, leads to timing corrections of magnitude (h/f)(πfL^2/R), where h is the gravitational wave strain amplitude, L the pulsar-Earth distance, R the source-Earth distance, and f the characteristic gravitational wave frequency. The timing precision of the best IPTA pulsars are better than 100 ns rms; correspondingly pulsar timing array observations should be capable of measuring the timing parallax distance to point gravitational wave sources at cosmological distances. )

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