6533b852fe1ef96bd12aa314
RESEARCH PRODUCT
The dark side of curvature
Enrique Fernandez MartinezOlga MenaGabriela BarenboimLicia Verdesubject
Equation of stateCosmology and Nongalactic Astrophysics (astro-ph.CO)Cosmic microwave backgroundFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsCurvature01 natural sciencessymbols.namesakeHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesDark energy experiments010303 astronomy & astrophysicsPhysics010308 nuclear & particles physicsAngular diameter distanceAstronomy and AstrophysicsRedshiftCosmological parameters from CMBRHigh Energy Physics - PhenomenologysymbolsDark energyBaryon acoustic-oscillationsBaryon acoustic oscillationsHubble's lawAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
Geometrical tests such as the combination of the Hubble parameter H(z) and the angular diameter distance d(A)(z) can, in principle, break the degeneracy between the dark energy equation of state parameter w(z), and the spatial curvature Omega(k) in a direct, model-independent way. In practice, constraints on these quantities achievable from realistic experiments, such as those to be provided by Baryon Acoustic Oscillation (BAO) galaxy surveys in combination with CMB data, can resolve the cosmic confusion between the dark energy equation of state parameter and curvature only statistically and within a parameterized model for w(z). Combining measurements of both H(z) and d(A)(z) up to sufficiently high redshifts z similar to 2 and employing a parameterization of the redshift evolution of the dark energy equation of state are the keys to resolve the w(z) - Omega(k) degeneracy.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-10-01 |