Probing Dark Energy with Neutrino Number
Seokcheon Lee
TL;DR
This paper discusses how the degeneracy between neutrino number and dark energy properties in the CMB can be broken using future galaxy surveys, aiding in probing dark energy.
Contribution
It highlights the degeneracy between Neff and dark energy equation of state w in CMB measurements and proposes using galaxy surveys to distinguish between them.
Findings
CMB measurements alone cannot distinguish Neff from different dark energy models.
Future galaxy surveys can break the degeneracy using matter power spectrum data.
Accurate determination of Neff and dark energy parameters is possible with combined observations.
Abstract
From measurements of the cosmic microwave background (CMB), the effective number of neutrino is found to be close to the standard model value Neff = 3.046 for the \LambdaCDM cosmology. One can obtain the same CMB angular power spectrum as that of \LambdaCDM for the different value of Neff by using the different dark energy model (i.e. for the different value of w). This degeneracy between Neff and w in CMB can be broken from future galaxy survey using the matter power spectrum.
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Taxonomy
TopicsCosmology and Gravitation Theories · Radio Astronomy Observations and Technology · Dark Matter and Cosmic Phenomena