Features in the primordial spectrum: New constraints from WMAP7 and ACT data and prospects for the Planck mission

Benetti, Micol, Lattanzi, Massimiliano, Calabrese, Erminia ORCID: https://orcid.org/0000-0003-0837-0068 and Melchiorri, Alessandro 2011. Features in the primordial spectrum: New constraints from WMAP7 and ACT data and prospects for the Planck mission. Physical Review D 84 (6) , 063509. 10.1103/PhysRevD.84.063509

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Abstract

We update the constraints on possible features in the primordial inflationary density perturbation spectrum by using the latest data from the WMAP7 and ACT (Atacama Cosmology Telescope) cosmic microwave background experiments. The inclusion of new data significantly improves the constraints with respect to older work, especially to smaller angular scales. While we found no clear statistical evidence in the data for extensions to the simplest, featureless, inflationary model, models with a step provide a significantly better fit than standard featureless power-law spectra. We show that the possibility of a step in the inflationary potential like the one preferred by current data will soon be tested by the forthcoming temperature and polarization data from the Planck satellite mission.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	American Physical Society
ISSN:	2470-0010
Date of First Compliant Deposit:	9 October 2017
Date of Acceptance:	28 July 2011
Last Modified:	06 May 2023 00:01
URI:	https://orca.cardiff.ac.uk/id/eprint/105338

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