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Early dark energy constraints on growing neutrino quintessence cosmologies.

Noble Chamings, Finlay and Avgoustidis, Anastasios and Copeland, Edmund J. and Green, Anne M. and Li, Baojiu (2019) 'Early dark energy constraints on growing neutrino quintessence cosmologies.', Physical review D., 100 (4). 043525.


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.

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Publisher statement:Reprinted with permission from the American Physical Society: Noble Chamings, Finlay, Avgoustidis, Anastasios, Copeland, Edmund J., Green, Anne M. & Li, Baojiu (2019). Early dark energy constraints on growing neutrino quintessence cosmologies. Physical Review D 100(4): 043525 © 2019 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:No date available
Date deposited:20 August 2019
Date of first online publication:13 August 2019
Date first made open access:20 August 2019

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