Barotropic fluid compatible parametrizations of dark energy
arXiv:2004.05342 · doi:10.1140/epjc/s10052-020-8199-9
Abstract
Parametrizations of Equation of state parameter as a function of the scale factor or redshift are frequently used in dark energy modeling. The question investigated in this paper is if parametrizations proposed in the literature are compatible with the dark energy being a barotropic fluid. The test of this compatibility is based on the functional form of the speed of sound squared, which for barotropic fluid dark energy follows directly from the function for the Equation of state parameter. The requirement that the speed of sound squared should be between 0 and speed of light squared provides constraints on model parameters using analytical and numerical methods. It is found that this fundamental requirement eliminates a large number of parametrizations as barotropic fluid dark energy models and puts strong constraints on parameters of other dark energy parametrizations.
arXiv commentv1: 19 pages, 1 table, 4 figures. v2: minor changes, references added. v3: version accepted in EPJC
References in corpus (38)
- Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
- Measurements of Omega and Lambda from 42 High-Redshift Supernovae
- Dynamics of dark energy
- f(R) Theories Of Gravity
- f(R) theories
- Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
- Exploring the Expansion History of the Universe
- Accelerating Universes with Scaling Dark Matter
- Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
- Dark Energy and the Accelerating Universe
- Dynamical dark energy in light of the latest observations
- The Expansion of the Universe is Faster than Expected
- Non-minimal dark sector physics and cosmological tensions
- Comparison of the Legacy and Gold SnIa Dataset Constraints on Dark Energy Models
- Dark energy two decades after: Observables, probes, consistency tests
- Constraining the equation of state of the Universe from Distant Type Ia Supernovae and Cosmic Microwave Background Anisotropies
- Phenomenological parameterization of quintessence
- A parametric model for dark energy
- First evidence of running cosmic vacuum: challenging the concordance model
- Gravitational Lensing as a Probe of Quintessence
- EXPERIMENTAL LIMITS ON THE DARK MATTER HALO OF THE GALAXY FROM GRAVITATIONAL MICROLENSING.
- Probing the dynamics of dark energy with novel parametrizations
- Aetherizing Lambda: Barotropic Fluids as Dark Energy
- Probing the curvature and dark energy
- Cosmological Applications of Pade Approximant
- A Comparison of Thawing and Freezing Dark Energy Parametrizations
- Results from the Wilkinson Microwave Anisotropy Probe
- SN and BAO constraints on (new) polynomial dark energy parametrizations: current results and forecasts
- A New Class of Parametrization for Dark Energy without Divergence
- Latest astronomical constraints on some nonlinear parametric dark energy models
- Revisiting the parametrization of Equation of State of Dark Energy via SNIa Data
- Constraints on the dark energy equation of state from the separation of CMB peaks and the evolution of alpha
- A new parametrization of dark energy equation of state leading to double exponential potential
- A new parametrization for dark energy density and future deceleration
- Dark sector unifications: dark matter-phantom energy, dark matter -- constant dark energy, dark matter-dark energy-dark matter
- Generalized models of unification of dark matter and dark energy
- Transient dark energy, cosmological constant boundary crossing and dark energy data fits
- A general parametric model for the dynamic dark energy
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- Dark energy in light of the early JWST observations: case for a negative cosmological constant?
- An overview of what current data can (and cannot yet) say about evolving dark energy
- Soundness of Dark Energy properties
- Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies
- New parametrization of the dark-energy equation of state with a single parameter
- Cosmographic Footprints of Dynamical Dark Energy
- Latest data constraint of some parameterized dark energy models
- Dark energy, Ricci-nonflat spaces, and the Swampland
- Shape of Dark Energy: Constraining Its Evolution with a General Parametrization
- Revisiting CPL with sign-switching density: To cross or not to cross the NECB
- Constraining neutrino mass in dynamical dark energy cosmologies with the logarithm parametrization and the oscillating parametrization
- A New Window on Dynamical Dark Energy: Combining DESI-DR2 BAO with future Gravitational Wave Observations
- Dark matter fluid constraints from galaxy rotation curves