Exploring Cosmic Origins with CORE: Cosmological Parameters
(2018) Journal of Cosmology and Astroparticle Physics — Vol. 2018, p. APRIL 2018 (2018)
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- Abstract
- We forecast the main cosmological parameter constraints achievable with theCORE space mission which is dedicated to mapping the polarisation of the Cosmic MicrowaveBackground (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 theimpact of various instrumental options, in particular the telescope size and sensitivity level,and review the great, transformative potential of the mission as proposed. Specifically, weassess the impact on a broad range of fundamental parameters of our Universe as a functionof the expected CMB characteristics, with other papers in the series focusing on controllingastrophysical and instrumental residual systematics. In this paper, we assume that only afew central CORE frequency channels are usable for our purpose, all others being devotedto the cleaning of astrophysical contaminants. On the theoretical side, we assumeΛCDMasour general framework and quantify the improvement provided by CORE over the currentconstraints from the Planck 2015 release. We also study the joint sensitivity of CORE andof future Baryon Acoustic Oscillation and Large Scale Structure experiments like DESI andEuclid. Specific constraints on the physics of inflation are presented in another paper of theseries. In addition to the six parameters of the baseΛCDM, which describe the matter contentof a spatially flat universe with adiabatic and scalar primordial fluctuations from inflation, wederive the precision achievable on parameters like those describing curvature, neutrino physics,extra light relics, primordial helium abundance, dark matter annihilation, recombinationphysics, variation of fundamental constants, dark energy, modified gravity, reionization andcosmic birefringence. In addition to assessing the improvement on the precision of individualparameters, we also forecast the post-CORE overall reduction of the allowed parameter spacewith figures of merit for various models increasing by as much as∼107as compared to Planck2015, and105with respect to Planck 2015 + future BAO measurements.
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Ringeval, C., & et al. (2018). Exploring Cosmic Origins with CORE: Cosmological Parameters. Journal of Cosmology and Astroparticle Physics, 2018, APRIL 2018. https://doi.org/10.1088/1475-7516/2018/04/017 (Original work published 2018)