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Detecting an anisotropic gravitational wave background with LISA

G Giampieri and A G Polnarev

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We address the problem of detecting a stochastic background originated by an anisotropic population of sources, like the galactic binaries, by exploiting the amplitude modulation of the signal as the antenna changes its orientation with respect to fixed stars. This modulation, if observed, could help in discriminating the background generated by galactic binaries from the isotropic gravitational wave background generated in the early Universe.


PACS

04.80.Nn Gravitational wave detectors and experiments

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

97.80.-d Binary and multiple stars

95.55.Ym Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques

MSC

83C35 Gravitational waves

85A15 Galactic and stellar structure

Subjects

Instrumentation and measurement

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 6 (June 1997)

Received 16 August 1996, in final form 10 February 1997



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