Constraints on Single-Field Inflation from the BOSS Galaxy Survey

Abstract

Non-local primordial non-Gaussianity (NLPNG) is a smoking gun of interactions in single-field inflationary models, and can be written as a combination of the equilateral and orthogonal templates. We present the first constraints on these from the redshift-space galaxy power spectra and bispectra of the Baryon Oscillation Spectroscopic Survey (BOSS) data. These are the first such measurements independent of the cosmic microwave background fluctuations. We perform a consistent analysis that includes all necessary nonlinear corrections generated by NLPNG, and vary all relevant cosmological and nuisance parameters in a global fit to the data. Our conservative analysis yields joint limits on the amplitudes of the equilateral and orthogonal shapes, $f_{\mathrm{NL}}^{\mathrm{equil}}=940\pm 600$, $f_{\mathrm{NL}}^{\mathrm{ortho}}=-170\pm 170$ (both at 68\% CL). These can be used to derive constraints on coefficients of the effective single-field inflationary Lagrangian; in particular, we find that the sound speed of inflaton fluctuations has the bound $c_s\ge 0.013$ at 95\% CL. Fixing the quadratic galaxy bias and cosmological parameters, the constraints can be tightened to $f_{\mathrm{NL}}^{\mathrm{equil}}=260\pm 300$, $f_{\mathrm{NL}}^{\mathrm{ortho}}=-23\pm 120$ (68\% CL).

6+7 pages, 2+3 figures, 0+1 table, code available at github.com/Michalychforever/CLASS-PT, with custom MontePython likelihoods available at github.com/oliverphilcox/full_shape_likelihoods

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Cited by in corpus (21)

• Constraints on Multi-Field Inflation from the BOSS Galaxy Survey
• The BOSS bispectrum analysis at one loop from the Effective Field Theory of Large-Scale Structure
• Can we actually constrain $f_{\mathrm{NL}}$ using the scale-dependent bias effect? An illustration of the impact of galaxy bias uncertainties using the BOSS DR12 galaxy power spectrum
• Parity violation in the scalar trispectrum: no-go theorems and yes-go examples
• Colliding Ghosts: Constraining Inflation with the Parity-Odd Galaxy Four-Point Function
• Constraints on modified gravity from the BOSS galaxy survey
• Limits on primordial non-Gaussianities from BOSS galaxy-clustering data
• Quijote-PNG: Simulations of primordial non-Gaussianity and the information content of the matter field power spectrum and bispectrum
• Cosmological inference from the EFTofLSS: the eBOSS QSO full-shape analysis
• Constraining Single-Field Inflation with MegaMapper
• Cosmological constraints from the power spectrum of eBOSS quasars
• The Halo Bispectrum Multipoles in Redshift Space
• Bispectrum-window convolution via Hankel transform
• Cosmological Information in Skew Spectra of Biased Tracers in Redshift Space
• Quijote-PNG: Quasi-maximum likelihood estimation of Primordial Non-Gaussianity in the non-linear dark matter density field
• Fisher Forecasts for Primordial non-Gaussianity from Persistent Homology
• Modal compression of the redshift-space galaxy bispectrum
• Inflationary Adler Conditions
• Quijote-PNG: Quasi-maximum likelihood estimation of Primordial Non-Gaussianity in the non-linear halo density field
• The halo 3-point correlation function: a methodological analysis
• Cosmology with the Redshift-Space Galaxy Bispectrum Monopole at One-Loop Order