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Oscillating bispectra and galaxy clustering: A novel probe of inflationary physics with large-scale structure

Cyr-Racine, Francis-Yan and Schmidt, Fabian (2011) Oscillating bispectra and galaxy clustering: A novel probe of inflationary physics with large-scale structure. Physical Review D, 84 (8). Art. No. 083505 . ISSN 2470-0010.

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Many models of inflation predict oscillatory features in the bispectrum of primordial fluctuations. Since it has been shown that primordial non-Gaussianity can lead to a scale-dependent halo bias, we investigate the effect of oscillations in the three-point function on the clustering of dark-matter halos. Interestingly, we find that features in the inflaton potential such as oscillations or sharp steps get imprinted in the mass dependence of the non-Gaussian halo bias. In this paper, we focus on models displaying a sharp feature in the inflaton potential as well as resonant non-Gaussianity. In both cases, we find a strong scale dependence for the non-Gaussian halo bias with a slope similar to that of the local model. In the resonant case, we find that the non-Gaussian bias oscillates with halo mass, a novel feature that is unique to this type of models. In the case of a sharp feature in the inflaton potential, we find that the clustering of halos is enhanced at the mass scale corresponding to the Fourier mode that exited the horizon when the inflaton was crossing the feature in the potential. Both of these are new effects that open the possibility of characterizing the inflationary potential with large-scale-structure surveys. We briefly discuss the prospects for detecting these non-Gaussian effects.

Item Type:Article
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Cyr-Racine, Francis-Yan0000-0002-7939-2988
Additional Information:© 2011 American Physical Society. Received 5 July 2011; published 7 October 2011. We thank Marc Kamionkowski, Xingang Chen, and Kris Sigurdson for useful discussions. This work was made possible through a Michael Smith Foreign Study Supplement from the National Science and Engineering Research Council (NSERC) of Canada. F.Y. C. R. wishes to thank the California Institute of Technology for hospitality while this work was completed. F. S. was supported by the Gordon and Betty Moore Foundation at Caltech.
Group:Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:8
Classification Code:PACS: 98.80.-k, 98.80.Jk
Record Number:CaltechAUTHORS:20111122-103056677
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Official Citation:Oscillating bispectra and galaxy clustering: A novel probe of inflationary physics with large-scale structure Francis-Yan Cyr-Racine and Fabian Schmidt Published 7 October 2011 (9 pages) 083505
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27912
Deposited By: Ruth Sustaita
Deposited On:22 Nov 2011 18:52
Last Modified:09 Mar 2020 13:18

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