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Dark energy scaling from dark matter to acceleration

Title
Dark energy scaling from dark matter to acceleration
Authors
Bielefeld, JannisCaldwell, Robert R.Linder, Eric V.
Ewha Authors
Eric V. Linder
Issue Date
2014
Journal Title
PHYSICAL REVIEW D
ISSN
1550-7998JCR Link1550-2368JCR Link
Citation
vol. 90, no. 4
Publisher
AMER PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
The dark sector of the Universe need not be completely separable into distinct dark matter and dark energy components. We consider a model of early dark energy in which the dark energy mimics a dark matter component in both evolution and perturbations at early times. Barotropic aether dark energy scales as a fixed fraction, possibly greater than one, of the dark matter density and has vanishing sound speed at early times before undergoing a transition. This gives signatures not only in cosmic expansion but in sound speed and inhomogeneities, and in number of effective neutrino species. Model parameters describe the timing, sharpness of the transition, and the relative abundance at early times. Upon comparison with current data, we find viable regimes in which the dark energy behaves like dark matter at early times: for transitions well before recombination the dark energy to dark matter fraction can equal or exceed unity, while for transitions near recombination the ratio can only be a few percent. After the transition, dark energy goes its separate way, ultimately driving cosmic acceleration and approaching a cosmological constant in this scenario.
DOI
10.1103/PhysRevD.90.043015
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자연과학대학 > 물리학전공 > Journal papers
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