Journal
PHYSICAL REVIEW D
Volume 106, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.106.043506
Keywords
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Funding
- Institute for Advanced Study
- NASA through the NASA Hubble Fellowship - Space Telescope Science Institute [HST-HF2-51483.001-A]
- NASA [NAS5-26555]
- Simons Foundation
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This study uses redshift-space galaxy clustering data from the BOSS survey to constrain local primordial non-Gaussianity (LPNG). The results show no evidence for primordial non-Gaussianity. The addition of the bispectrum analysis tightens the constraints and breaks degeneracies with non-Gaussian galaxy bias.
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(NL)(local) = -33 +/- 28 at 68% C.L., yielding no evidence for primordial non-Gaussianity. The addition of the bispectrum tightens the f(NL)(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.
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