APS : Constraints on multifield inflation from the BOSS galaxy survey

Cabass, Giovanni; Simonović, Marko; Ivanov, Mikhail M.; Zaldarriaga, Matias; Philcox, Oliver H.E.

doi:10.1103/PhysRevD.106.043506

Article
Report number	arXiv:2204.01781 ; CERN-TH-2022-055
Title	Constraints on multifield inflation from the BOSS galaxy survey
Related title	Constraints on Multi-Field Inflation from the BOSS Galaxy Survey
Author(s)	Cabass, Giovanni (Princeton, Inst. Advanced Study) ; Ivanov, Mikhail M. (Princeton, Inst. Advanced Study) ; Philcox, Oliver H.E. (Princeton U., Astrophys. Sci. Dept. ; Princeton, Inst. Advanced Study) ; Simonović, Marko (CERN) ; Zaldarriaga, Matias (Princeton, Inst. Advanced Study)
Publication	2022-08-03
Imprint	2022-04-04
Number of pages	20
Note	20 pages, 5 figures
In:	Phys. Rev. D 106 (2022) 043506
DOI	10.1103/PhysRevD.106.043506 (publication)
Subject category	hep-th ; Particle Physics - Theory ; hep-ph ; Particle Physics - Phenomenology ; gr-qc ; General Relativity and Cosmology ; astro-ph.CO ; Astrophysics and Astronomy
Abstract	We use redshift-space galaxy clustering data from the BOSS survey to constrain local primordial non-Gaussianity (LPNG). This is of particular importance due to the consistency relations, which imply that a detection of LPNG would rule out all single-field inflationary models. Our constraints are based on the consistently analyzed redshift-space galaxy power spectra and bispectra, extracted from the public BOSS data with optimal window-free estimators. We use a complete perturbation theory model including all one-loop power spectrum corrections generated by LPNG. Our constraint on the amplitude of the local non-Gaussian shape is $f_{\rm NL}^{\rm local}=-33\pm 28$ at 68% CL, yielding no evidence for primordial non-Gaussianity. The addition of the bispectrum tightens the $f_{\rm NL}^{\rm local}$ constraints from BOSS by $20\%$, and allows breaking of degeneracies with non-Gaussian galaxy bias. These results set the stage for the analysis of future surveys, whose larger volumes will yield significantly tighter constraints on LPNG.
Copyright/License	publication: © 2022-2024 American Physical Society preprint: (License: CC BY 4.0)

$\textbf{Left panel} -- ``Gaussian'' one-loop contributions to the power spectrum monopole at $z=0.61$ compared with linear theory. We take $b_1 = 1$, and the different curves have the corresponding bias parameters set to unity. \textbf{Right panel} -- PNG contributions to the power spectrum monopole at $z=0.61$ compared with linear theory. We take $f_{\rm NL} = 100$ and $b_1=1$. The grey curve shows the scale-dependent bias contribution for $b_\phi=1$. The remaining curves show the different contributions ($P_{12}$ and $P_{22}^{f_{\rm NL}} + P_{13}^{f_{\rm NL}}$) to $P^{\rm NG}_{\text{$1$-loop}}$ for unit values of the corresponding bias parameters.$ $\textbf{Left panel} -- ``Gaussian'' one-loop contributions to the power spectrum monopole at $z=0.61$ compared with linear theory. We take $b_1 = 1$, and the different curves have the corresponding bias parameters set to unity. \textbf{Right panel} -- PNG contributions to the power spectrum monopole at $z=0.61$ compared with linear theory. We take $f_{\rm NL} = 100$ and $b_1=1$. The grey curve shows the scale-dependent bias contribution for $b_\phi=1$. The remaining curves show the different contributions ($P_{12}$ and $P_{22}^{f_{\rm NL}} + P_{13}^{f_{\rm NL}}$) to $P^{\rm NG}_{\text{$1$-loop}}$ for unit values of the corresponding bias parameters.$ $: Marginalized constraint on $\fnl^{\rm local}$ from the mean of $84$ \textsc{Nseries} simulations, with a total volume approximately $40\times$ larger than that of BOSS. Note that we do \textit{not} rescale the covariance to the BOSS volume, but use that appropriate for the entire \textsc{Nseries} volume, allowing a robust probe of theoretical systematics. Here, we find $f_{\rm NL}^{\rm local} = -4.9 \pm 5.0$ at $68\%$\,CL.$ Show more plots

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Record created 2022-04-23, last modified 2023-11-24

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