Parameter discordance in Planck CMB and low-redshift measurements: projection in the primordial power spectrum - INSPIRE

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Parameter discordance in Planck CMB and low-redshift measurements: projection in the primordial power spectrum

Oct 18, 2018

6 pages

Published in:

JCAP 04 (2019) 036

Published: Apr 23, 2019

e-Print:

1810.08101 [astro-ph.CO]

DOI:

10.1088/1475-7516/2019/04/036 (publication)

View in:

ADS Abstract Service

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Abstract: (IOP)

We discuss the discordance between the estimated values of the cosmological parameters from Planck assuming the concordance ΛCDM model and low-redshift measurements. In particular, we consider the Hubble constant mismatch between Planck temperature constraint for the ΛCDM model and the Riess et al. [1] local measurements as well as the discordance between the estimated value of S8 from Planck and some weak lensing surveys such as Kilo Degree Survey (KiDS-450) and Dark Energy Survey (DES) observations. The discordance can come from a wide range of non-standard cosmological or astrophysical processes as well as from some particular systematics of the observations. In this paper, without considering any particular astrophysical process or extension to the standard model at the background level, we seek solely to project the effect of these differences in the values of the key cosmological parameters on to the shape of the primordial power spectrum (PPS) . In order to realise this goal, we uncover the shape of the PPS by implementing the Modified Richardson-Lucy algorithm (MRL) that fits the Planck temperature data as acceptably as the case of the standard model of cosmology, but with a Hubble constant consistent with local measurements as well as improving the consistency between the derived S8 and σ8 parameters with estimations of the weak lensing surveys.

Note:

6 pages, 4 figures

98.80.Cq
power spectrum: primordial
Planck
Hubble constant
dark matter: density
temperature
lens
cosmic background radiation
cosmological model: parameter space
dark energy: density

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