21-cm Background Anisotropies Can Discern Primordial Non-Gaussianity

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dc.creatorCooray, Asantha
dc.date2006-10-09
dc.date2006-11-23
dc.date.accessioned2026-07-07T11:26:09Z
dc.date.available2026-07-07T11:26:09Z
dc.descriptionThe non-Gaussianity of initial perturbations provides information on the mechanism that generated primordial density fluctuations. The expected non-Gaussianity for slow-roll inflationary models is well below the ultimate detection level with cosmic microwave background (CMB) anisotropies or large-large structure at low redshifts. We find that 21-cm background anisotropies of the low-frequency radio sky due to inhomogeneous neutral Hydrogen distribution at redshifts between 30 and 100 captures information on primordial non-Gaussianity better than any other cosmological probe. An all-sky 21-cm experiment over the frequency range from 14 MHz to 40 MHz using a bandwidth of 1 MHz and with angular information out to a multipole of 10^5 can limit the primordial non-Gaussianity parameter f_nl < 0.01. The 21-cm background should eventually reveal the non-Gaussianity associated with single field slow-roll inflation.
dc.description4 pages, 1 figure; accepted version in press with PRL. Revised version shortens the title and correctly describes the connection between f_nl and the slow-roll inflationary prediction
dc.identifierhttps://arxiv.org/abs/astro-ph/0610257
dc.identifierhttp://arxiv.org/abs/astro-ph/0610257
dc.identifierPhys.Rev.Lett.97:261301,2006
dc.identifierdoi:10.1103/PhysRevLett.97.261301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195736
dc.subjectAstrophysics
dc.title21-cm Background Anisotropies Can Discern Primordial Non-Gaussianity
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