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A search for periodic gravitational waves, from sources such as isolatedrapidly-spinning neutron stars, was carried out using 510 hours of data fromthe fourth LIGO science run (S4). The search was for quasi-monochromatic wavesin the frequency range from 50 Hz to 1500 Hz, with a linear frequency driftf-dot (measured at the solar system barycenter) in the range -f/tau < f-dot <0.1 f/tau, where the minimum spin-down age tau was 1000 years for signals below300 Hz and 10000 years above 300 Hz. The main computational work of the searchwas distributed over approximately 1 computers volunteered by the generalpublic. This large computing power allowed the use of a relatively longcoherent integration time of 30 hours, despite the large parameter spacesearched. No statistically significant signals were found. The sensitivity ofthe search is estimated, along with the fraction of parameter space that wasvetoed because of contamination by instrumental artifacts. In the 100 Hz to 200Hz band, more than 90% of sources with dimensionless gravitational wave strainamplitude greater than 1e-23 would have been detected.

The Einstein@Home search for periodic gravitational waves in LIGO S4 data