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The observed galaxy bispectrum from single-field inflation in the squeezed limit

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Using the consistency relation in Fourier space, we derive the observed galaxy bispectrum from single-field inflation in the squeezed limit, in which one of the three modes has a wavelength much longer than the other two. This provides a non-trivial check of the full computation of the bispectrum based on second-order cosmological perturbation theory in this limit. We show that gauge modes need to be carefully removed in the second-order cosmological perturbations in order to calculate the observed galaxy bispectrum in the squeezed limit. We then give an estimate of the effective non-Gaussianity due to general relativistic lightcone effects that could mimic a primordial non-Gaussian signal.
Original languageEnglish
Article number050
Number of pages20
JournalJournal of Cosmology and Astroparticle Physics
Volume2018
Issue number07
DOIs
StatePublished - 23 Jul 2018

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  • 1805.09189v2

    Rights statement: This is an author-created, un-copyedited version of an article published in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1475-7516/2018/07/050.

    Accepted author manuscript (Post-print), 656 KB, PDF-document

    Due to publisher’s copyright restrictions, this document is not freely available to download from this website until: 23/07/19

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DOI: https://doi.org/10.1088/1475-7516/2018/07/050

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