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

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The observed galaxy bispectrum from single-field inflation in the squeezed limit. / Koyama, Kazuya; Umeh, Obinna; Maartens, Roy; Bertacca, Daniele.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2018, No. 07, 050, 23.07.2018.

Research output: Contribution to journalArticlepeer-review

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Author

Koyama, Kazuya ; Umeh, Obinna ; Maartens, Roy ; Bertacca, Daniele. / The observed galaxy bispectrum from single-field inflation in the squeezed limit. In: Journal of Cosmology and Astroparticle Physics. 2018 ; Vol. 2018, No. 07.

Bibtex

@article{8a0524cf152649c5aa904a0a9040848d,
title = "The observed galaxy bispectrum from single-field inflation in the squeezed limit",
abstract = "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.",
keywords = "astro-ph.CO, gr-qc, hep-th, RCUK, STFC, ST/N000668/1",
author = "Kazuya Koyama and Obinna Umeh and Roy Maartens and Daniele Bertacca",
note = "16 pages, 2 figures, accepted for publication in JCAP",
year = "2018",
month = jul,
day = "23",
doi = "10.1088/1475-7516/2018/07/050",
language = "English",
volume = "2018",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "07",

}

RIS

TY - JOUR

T1 - The observed galaxy bispectrum from single-field inflation in the squeezed limit

AU - Koyama, Kazuya

AU - Umeh, Obinna

AU - Maartens, Roy

AU - Bertacca, Daniele

N1 - 16 pages, 2 figures, accepted for publication in JCAP

PY - 2018/7/23

Y1 - 2018/7/23

N2 - 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.

AB - 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.

KW - astro-ph.CO

KW - gr-qc

KW - hep-th

KW - RCUK

KW - STFC

KW - ST/N000668/1

U2 - 10.1088/1475-7516/2018/07/050

DO - 10.1088/1475-7516/2018/07/050

M3 - Article

VL - 2018

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 07

M1 - 050

ER -

ID: 10843248