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Distinguishing between neutrinos and time-varying dark energy through cosmic time

Lorenz, Christiane S., Calabrese, Erminia and Alonso, David 2017. Distinguishing between neutrinos and time-varying dark energy through cosmic time. Physical Review D 96 , 043510. 10.1103/PhysRevD.96.043510

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Abstract

We study the correlations between parameters characterizing neutrino physics and the evolution of dark energy. Using a uid approach, we show that time-varying dark energy models exhibit degeneracies with the cosmic neutrino background over extended periods of the cosmic history, leading to a degraded estimation of the total mass and number of species of neutrinos. We investigate how to break degeneracies and combine multiple probes across cosmic time to anchor the behaviour of the two components. We use Planck CMB data and BAO measurements from the BOSS, SDSS and 6dF surveys to present current limits on the model parameters, and then forecast the future reach from the CMB Stage-4 and DESI experiments. We show that a multi-probe analysis of current data provides only marginal improvement on the determination of the individual parameters and no reduction of the correlations. Future observations will better distinguish the neutrino mass and preserve the current sensitivity to the number of species even in case of a time-varying dark energy component.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: American Physical Society
ISSN: 2470-0010
Date of First Compliant Deposit: 24 July 2017
Date of Acceptance: 20 July 2017
Last Modified: 10 Jun 2018 00:27
URI: http://orca.cf.ac.uk/id/eprint/102879

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