The dark degeneracy: On the number and nature of dark components
Feb, 2007Citations per year
Abstract: (arXiv)
We use that gravity probes only the total energy momentum tensor to show how this leads to a degeneracy for generalised dark energy models. Because of this degeneracy, Omega_m cannot be measured. We demonstrate this explicitely by showing that the CMB and supernova data is compatible with very large and very small values of Omega_m for a specific family of dark energy models. We also show that for the same reason interacting dark energy is always equivalent to a family of non-interacting models. We argue that it is better to face this degeneracy and to parametrise the actual observables.- 95.36.+x
- 95.35.+d
- 98.80.Jk
- dark energy
- gravitation
- tensor: energy-momentum
- cosmic background radiation
- supernova
- dark matter: density
- equation of state
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