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

Simple item page
dc.contributor.authorKoyama, Kazuya
dc.contributor.authorUmeh, Obinna
dc.contributor.authorMaartens, Roy
dc.contributor.authorBertacca, Daniele
dc.date.accessioned2018-09-04T13:52:29Z
dc.date.available2018-09-04T13:52:29Z
dc.date.issued2018
dc.description.abstractUsing the consistency relation in Fourier space, we derive the observed galaxy bispectrum from single- eld in ation 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 e ective non- Gaussianity due to general-relativistic lightcone e ects that could mimic a primordial non-Gaussian signal.en_US
dc.identifier.citationKoyama, K. et al. (2018). The observed galaxy bispectrum from single- eld in ation in the squeezed limit. Journal of Cosmology and Astroparticle Physics, 20180: 050en_US
dc.identifier.issn1475-7516
dc.identifier.urihttp://dx.doi.org/10.1088/1475-7516/2018/07/050
dc.identifier.urihttp://hdl.handle.net/10566/4016
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherIOP Publishingen_US
dc.rightsThis is a pre-print version of the article published online at: http://dx.doi.org/10.1088/1475-7516/2018/07/050
dc.status.ispeerreviewedTRUE
dc.subjectFourier spaceen_US
dc.subjectGalaxyen_US
dc.subjectGalaxy bispectrumen_US
dc.subjectSingle-fi eld inflationen_US
dc.titleThe observed galaxy bispectrum from single-field inflation in the squeezed limiten_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Koyama_The-observed-galaxy_2018.pdf
Size:
656.59 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Research Articles (Physics)