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Abstract

The Quadratic Search: A method for detecting gravitational waves from pulsars in binary systems

Continuous gravitational waves are emitted by non axial symmetrical neutron stars . The expected signals will be small but the signal to noise ratio can be improved by longer integration times. Since many neutron stars are located in binary systems, their Kepler orbit will induce an additional Doppler shift of the detected signal. This shift will cause the power in the signal to spread out over a large frequency band and thus reduce the gain in signal to noise ratio by using long integration times. To still take advantage of the possibility to use long integration times, a new data analysis method, the "quadratic search method", has been developed to parameterize large Doppler shifts. The quadratic search method aims to be a data analysis method for doing an all-sky search for gravitational wave signals from neutron stars in binary systems. The method will be applied to the data from the VIRGO and LIGO detectors. In this talk the principles of the quadratic search method will be presented as well as the sensitivity estimates.

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