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    Scattering of gravitational radiation: Second order moments of the wave amplitude*

    134628_17729_aa0512-03.pdf (985.2Kb)
    Access Status
    Open access
    Authors
    Macquart, Jean-pierre
    Date
    2004
    Type
    Journal Article
    
    Metadata
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    Citation
    Macquart, J. P. 2004. Scattering of gravitational radiation: Second order moments of the wave amplitude*. Astronomy and Astrophysics. 422: pp. 761-775.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361:20034512
    ISSN
    0004-6361
    Faculty
    Faculty of Science and Engineering
    Curtin Institute of Radio Astronomy
    Remarks

    © INRA, EDP Sciences, 2004

    URI
    http://hdl.handle.net/20.500.11937/46265
    Collection
    • Curtin Research Publications
    Abstract

    Gravitational radiation that propagates through an inhomogeneous mass distribution is subject to random gravitational lensing, or scattering, causing variations in the wave amplitude and temporal smearing of the signal. A statistical theory is constructed to treat these effects. The statistical properties of the wave amplitude variations are a direct probe of the power spectrum of the mass distribution through which the waves propagate. Scattering temporally smears any intensity variationsintrinsic to a source emitting gravitational radiation, rendering variability on time scales shorter than the temporal smearing time scale unobservable, and potentially making the radiation much harder to detect. Gravitational radiation must propagate out through the mass distribution of its host galaxy before it can be detected at the Earth. Plausible models for the distribution of matter in an L* host galaxy suggest that the temporal smearing time scale is at least several milliseconds due to the gas content alone, and may be as large as a second if dark matter also scatters the radiation. The smearing time due to scattering by any galaxy interposed along the line of sight is a factor ~105 times larger. Gravitational scattering is an excellent probe of matter on parsec and sub-parsec scales, and has the potential to elucidate the nature of dark matter.

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