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Single-field inflation and the local ansatz: Distinguishability and consistency

de Putter, Roland and Doré, Olivier and Green, Daniel and Meyers, Joel (2017) Single-field inflation and the local ansatz: Distinguishability and consistency. Physical Review D, 95 (6). Art. No. 063501. ISSN 2470-0010.

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The single-field consistency conditions and the local ansatz have played separate but important roles in characterizing the non-Gaussian signatures of single- and multifield inflation respectively. We explore the precise relationship between these two approaches and their predictions. We demonstrate that the predictions of the single-field consistency conditions can never be satisfied by a general local ansatz with deviations necessarily arising at order (n_s-1)^2. This implies that there is, in principle, a minimum difference between single- and (fully local) multifield inflation in observables sensitive to the squeezed limit such as scale-dependent halo bias. We also explore some potential observational implications of the consistency conditions and its relationship to the local ansatz. In particular, we propose a new scheme to test the consistency relations. In analogy with delensing of the cosmic microwave background, one can deproject the coupling of the long wavelength modes with the short wavelength modes and test for residual anomalous coupling.

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URLURL TypeDescription Paper
Doré, Olivier0000-0002-5009-7563
Additional Information:© 2017 American Physical Society. Received 6 January 2017; published 3 March 2017. We thank Daniel Baumann, Rafael Porto, and Alex van Engelen for helpful discussions. D. G. was supported by an NSERC Discovery Grant and the Canadian Institute for Advanced Research. R. d. P. and O. D. acknowledge support by the Heising-Simons foundation. J. M. was supported by the Vincent and Beatrice Tremaine Fellowship. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canadian Institute for Advanced Research (CIFAR)UNSPECIFIED
Heising-Simons FoundationUNSPECIFIED
Vincent and Beatrice Tremaine FellowshipUNSPECIFIED
Record Number:CaltechAUTHORS:20170303-083431470
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74680
Deposited By: Tony Diaz
Deposited On:03 Mar 2017 16:47
Last Modified:03 Mar 2017 16:47

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