Handley, WJ;
Lasenby, AN;
Peiris, HV;
Hobson, MP;
(2019)
Bayesian inflationary reconstructions from Planck 2018 data.
Physical Review D
, 100
(10)
, Article 103511. 10.1103/PhysRevD.100.103511.
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Abstract
We present three nonparametric Bayesian primordial reconstructions using Planck 2018 polarization data: linear spline primordial power spectrum reconstructions, cubic spline inflationary potential reconstructions, and sharp-featured primordial power spectrum reconstructions. All three methods conditionally show hints of an oscillatory feature in the primordial power spectrum in the multipole range ℓ ∼ 20 to ℓ ∼ 50 , which is to some extent preserved upon marginalization. We find no evidence for deviations from a pure power law across a broad observable window ( 50 ≲ ℓ ≲ 2000 ), but find that parametrizations are preferred which are able to account for lack of resolution at large angular scales due to cosmic variance, and at small angular scales due to Planck instrument noise. Furthermore, the late-time cosmological parameters are unperturbed by these extensions to the primordial power spectrum. This work is intended to provide a background and give more details of the Bayesian primordial reconstruction work found in the Planck 2018 papers.
| Type: | Article |
|---|---|
| Title: | Bayesian inflationary reconstructions from Planck 2018 data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.100.103511 |
| Publisher version: | https://doi.org/10.1103/PhysRevD.100.103511 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, PROBE WMAP OBSERVATIONS, POWER SPECTRUM, MODEL SELECTION, MICROWAVE, ANISOTROPY, EFFICIENT |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10086361 |
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