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Biasing and the search for primordial non-Gaussianity beyond the local type

Gleyzes, Jérôme and de Putter, Roland and Green, Daniel and Doré, Olivier (2017) Biasing and the search for primordial non-Gaussianity beyond the local type. Journal of Cosmology and Astroparticle Physics, 2017 (4). Art. No. 002. ISSN 1475-7516. doi:10.1088/1475-7516/2017/04/002.

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Primordial non-Gaussianity encodes valuable information about the physics of inflation, including the spectrum of particles and interactions. Significant improvements in our understanding of non-Gaussanity beyond Planck require information from large-scale structure. The most promising approach to utilize this information comes from the scale-dependent bias of halos. For local non-Gaussanity, the improvements available are well studied but the potential for non-Gaussianity beyond the local type, including equilateral and quasi-single field inflation, is much less well understood. In this paper, we forecast the capabilities of large-scale structure surveys to detect general non-Gaussianity through galaxy/halo power spectra. We study how non-Gaussanity can be distinguished from a general biasing model and where the information is encoded. For quasi-single field inflation, significant improvements over Planck are possible in some regions of parameter space. We also show that the multi-tracer technique can significantly improve the sensitivity for all non-Gaussianity types, providing up to an order of magnitude improvement for equilateral non-Gaussianity over the single-tracer measurement.

Item Type:Article
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URLURL TypeDescription Paper
Doré, Olivier0000-0002-5009-7563
Additional Information:© 2017 IOP Publishing Ltd and Sissa Medialab srl. Received 7 January 2017; Accepted 17 March 2017; Published 3 April 2017. We would like to thank Fabian Schmidt for helpful discussions. 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. This research is partially supported by NASA ROSES ATP 14-ATP14-0093 grant. RdP and O.D. acknowledge support by the Heising-Simons foundation.
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Heising-Simons FoundationUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20170404-081109923
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Official Citation:Jérôme Gleyzes et al JCAP04(2017)002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75668
Deposited By: Tony Diaz
Deposited On:04 Apr 2017 17:13
Last Modified:15 Nov 2021 16:35

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