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 language | English |
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Article number | 050 |
Number of pages | 20 |
Journal | Journal of Cosmology and Astroparticle Physics |
Volume | 2018 |
Issue number | 07 |
DOIs | |
Publication status | Published - 23 Jul 2018 |
Documents
- 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), 657 KB, PDF document
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