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    • Constraining Primordial Non-Gaussianity by Combining Photometric Galaxy and 21 Cm Intensity Mapping Surveys

    Mponeng Kopana,Sheean Jolicoeur,Roy Maartens

    The European Physical Journal C（2025）

    University of the Western Cape

    Cited 0|Views0
    Abstract
    The fluctuations produced during cosmic inflation may exhibit non-Gaussian characteristics that are imprinted in the large-scale structure of the Universe. This non-Gaussian imprint is an ultra-large scale signal that can be detected using the power spectrum. We focus on the local-type non-Gaussianity f_NL and employ a multi-tracer analysis that combines different probes in order to mitigate cosmic variance and maximize the non-Gaussian signal. In our previous paper, we showed that combining spectroscopic galaxy surveys with 21 cm intensity mapping surveys in interferometer mode could lead to a ∼ 20–30 23% in the former case and 16% in the latter case. Furthermore, we examine the impact of varying the foreground filter parameter, redshift range and sky area on the derived constraint. We find that the f_NL constraint is highly sensitive to both the redshift range and sky area. The foreground filter parameter shows negligible effect.
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