Early dark energy constraints on growing neutrino quintessence cosmologies

Noble Chamings, Finlay; Avgoustidis, Anastasios; Copeland, Edmund J.; Green, Anne M.; Li, Baojiu

Abstract

We investigate cosmological models in which dynamical dark energy consists of a scalar field whose present-day value is controlled by a coupling to the neutrino sector. The behavior of the scalar field depends on three functions: a kinetic function, the scalar field potential, and the scalar field-neutrino coupling function. We present an analytic treatment of the background evolution during radiation and matter domination for exponential and inverse power law potentials, and find a relaxation of constraints compared to previous work on the amount of early dark energy in the exponential case. We then carry out a numerical analysis of the background cosmology for both types of potential and various illustrative choices of the kinetic and coupling functions. By applying bounds from Planck on the amount of early dark energy, we are able to constrain the magnitude of the kinetic function at early times.

Citation

Noble Chamings, F., Avgoustidis, A., Copeland, E. J., Green, A. M., & Li, B. (2019). Early dark energy constraints on growing neutrino quintessence cosmologies. Physical Review D, 100(4), https://doi.org/10.1103/physrevd.100.043525

• Journal Article Type: Article
• Acceptance Date: Jul 29, 2019
• Online Publication Date: Aug 13, 2019
• Publication Date: Aug 15, 2019
• Deposit Date: Aug 21, 2019
• Publicly Available Date: Aug 23, 2019
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 100
• Issue: 4
• DOI: https://doi.org/10.1103/physrevd.100.043525
• Keywords: Physics and Astronomy (miscellaneous)
• Public URL: https://nottingham-repository.worktribe.com/output/2457449
• Publisher URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.100.043525
• Contract Date: Aug 21, 2019