Exploring cosmic origins with CORE : Cosmological parameters

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http://hdl.handle.net/10138/310473

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CORE Collaboration , Di Valentino , E , Kiiveri , K , Kurki-Suonio , H , Lindholm , V & Väliviita , J 2018 , ' Exploring cosmic origins with CORE : Cosmological parameters ' , Journal of Cosmology and Astroparticle Physics , no. 4 , 017 . https://doi.org/10.1088/1475-7516/2018/04/017

Title: Exploring cosmic origins with CORE : Cosmological parameters
Author: CORE Collaboration; Di Valentino, E.; Kiiveri, K.; Kurki-Suonio, H.; Lindholm, V.; Väliviita, J.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
Date: 2018-04
Language: eng
Number of pages: 87
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/310473
Abstract: We forecast the main cosmological parameter constraints achievable with the CORE space mission which is dedicated to mapping the polarisation of the Cosmic Microwave Background (CMB). CORE was recently submitted in response to ESA's fifth call for medium-sized mission proposals (M5). Here we report the results from our pre-submission study of the impact of various instrumental options, in particular the telescope size and sensitivity level, and review the great, transformative potential of the mission as proposed. Specifically, we assess the impact on a broad range of fundamental parameters of our Universe as a function of the expected CMB characteristics, with other papers in the series focusing on controlling astrophysical and instrumental residual systematics. In this paper, we assume that only a few central CORE frequency channels are usable for our purpose, all others being devoted to the cleaning of astrophysical contaminants. On the theoretical side, we assume ACDM as our general framework and quantify the improvement provided by CORE over the current constraints from the Planck 2015 release. We also study the joint sensitivity of CORE and of future Baryon Acoustic Oscillation and Large Scale Structure experiments like DESI and Euclid. Specific constraints on the physics of inflation are presented in another paper of the series. In addition to the six parameters of the base ACDM, which describe the matter content of a spatially flat universe with adiabatic and scalar primordial fluctuations from inflation, we derive the precision achievable on parameters like those describing curvature, neutrino physics, extra light relics, primordial helium abundance, dark matter annihilation, recombination physics, variation of fundamental constants, dark energy, modified gravity, reionization and cosmic birefringence. In addition to assessing the improvement on the precision of individual parameters, we also forecast the post-CORE overall reduction of the allowed parameter space with figures of merit for various models increasing by as much as similar to 10(7) as compared to Planck 2015, and 10(5) with respect to Planck 2015 + future BAO measurements.
Subject: cosmological parameters from CMBR
CMBR experiments
neutrino masses from cosmology
FINE-STRUCTURE CONSTANT
MICROWAVE BACKGROUND POLARIZATION
ANGULAR POWER SPECTRUM
LARGE-SCALE STRUCTURE
TEMPERATURE-REDSHIFT RELATION
PROBING NEUTRINO MASSES
COBE FIRAS INSTRUMENT
BROKEN LEPTON NUMBER
DIGITAL SKY SURVEY
COLD DARK-MATTER
115 Astronomy, Space science
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