Observing Nulling of Primordial Correlations via the 21-cm Signal

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8028

Title:	Observing Nulling of Primordial Correlations via the 21-cm Signal
Authors:	Balaji, Shyam Ragavendra, H.V. Sethi, Shiv K. Silk, Joseph Sriramkumar, L.
Keywords:	gravitation cosmology astrophysics radio microwave inflation evolution of the universe
Issue Date:	22-Dec-2022
Publisher:	American Physical Society
Citation:	Physical Review Letters, 2022, Vol. 129, p261301
Abstract:	The 21-cm line emitted by neutral hydrogen (HI) during the Dark Ages carries imprints of pristine primordial correlations. In models of inflation driven by a single, canonical scalar field, we show that a phase of ultra-slow-roll can lead to a null in all the primordial correlations at a specific wave number kdip. We consider scenarios wherein the null in the correlations occurs over wave numbers 1≲kdip≲10 Mpc−1, and examine the prospects of detecting such a damping in the HI signal due to the nulls at the level of power and bispectra in future observational missions.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/8028
ISSN:	0031-9007 1079-7114 (Online)
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2022PhRvL.129z1301B/abstract https://arxiv.org/abs/2206.06386 https://doi.org/10.1103/PhysRevLett.129.261301 https://inspirehep.net/literature/2095914
Copyright:	2022 American Physical Society
Appears in Collections:	Research Papers (A&A)

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