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    Detecting the relativistic galaxy bispectrum

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    Maartens_2020_J._Cosmol._Astropart._Phys._2020_065 (1).pdf (1.107Mb)
    Date
    2020
    Author
    Maartens, Roy
    Jolicoeur, Sheean
    Umeh, Obinna
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    Abstract
    The Fourier galaxy bispectrum is complex, with the imaginary part arising from leading-order relativistic corrections, due to Doppler, gravitational redshift and related lineof-sight effects in redshift space. The detection of the imaginary part of the bispectrum is potentially a smoking gun signal of relativistic contributions. We investigate whether nextgeneration spectroscopic surveys could make such a detection. For a Stage IV spectroscopic Hα survey similar to Euclid, we find that the cumulative signal to noise of this relativistic signature is O(10). Long-mode relativistic effects couple to short-mode Newtonian effects in the galaxy bispectrum, but not in the galaxy power spectrum. This is the basis for detectability of relativistic effects in the bispectrum of a single galaxy survey, whereas the power spectrum requires multiple galaxy surveys to detect the corresponding signal.
    URI
    10.1088/1475-7516/2020/03/065
    http://hdl.handle.net/10566/5957
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    • Research Articles (Physics) [230]

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