Dark Energy Scaling from Dark Matter to Acceleration
arXiv:1404.2273 · doi:10.1103/PhysRevD.90.043015
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.
arXiv comment10 pages, 8 figures
References in corpus (36)
- The Seventh Data Release of the Sloan Digital Sky Survey
- Cosmological parameters from CMB and other data: a Monte-Carlo approach
- Cosmology and the Fate of Dilatation Symmetry
- A Dynamical Solution to the Problem of a Small Cosmological Constant and Late-time Cosmic Acceleration
- Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
- Cosmological Perturbation Theory in the Synchronous vs. Conformal Newtonian Gauge
- The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample
- A 3% Solution: Determination of the Hubble Constant with the Hubble Space Telescope and Wide Field Camera 3
- The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
- Kinetically Driven Quintessence
- The 6dF Galaxy Survey: Final Redshift Release (DR3) and Southern Large-Scale Structures
- The WiggleZ Dark Energy Survey: mapping the distance-redshift relation with baryon acoustic oscillations
- Field Theory of Tachyon Matter
- A classification of scalar field potentials with cosmological scaling solutions
- Purely kinetic k-essence as unified dark matter
- Structure formation with a self-tuning scalar field
- Tachyon Dynamics in Open String Theory
- A Measurement of the Damping Tail of the Cosmic Microwave Background Power Spectrum with the South Pole Telescope
- Dilatonic ghost condensate as dark energy
- The Atacama Cosmology Telescope: Cosmological parameters from three seasons of data
- The WiggleZ Dark Energy Survey: Final data release and cosmological results
- Solving the Coincidence Problem: Tracking Oscillating Energy
- Kinetic k-essence and Quintessence
- Aetherizing Lambda: Barotropic Fluids as Dark Energy
- Measuring the Speed of Dark: Detecting Dark Energy Perturbations
- DBI-essence
- Chaplygin-like gas and branes in black hole bulks
- Toward a Possible Solution to the Cosmic Coincidence Problem
- Condensate cosmology -- dark energy from dark matter
- New limits on Early Dark Energy from the South Pole Telescope
- New Constraints on the Early Expansion History
- Slinky Inflation
- Dark Before Light: Testing the Cosmic Expansion History through the Cosmic Microwave Background
- Early Modified Gravity: Implications for Cosmology
- Cosmology with a Continuous Tower of Scalar Fields
- Freezing Out Early Dark Energy
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- Oscillating and Static Universes from a Single Barotropic Fluid
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- Dynamics of classes of barotropic fluids in spatially curved FRW spacetimes
- Dark energy with : Asymptotic versus pseudo-