The dark degeneracy: On the number and nature of dark components

Details The dark degeneracy: On the number and nature of dark components The dark degeneracy: On the number and nature of dark components

2007-02-22

arxiv.org/abs/astro-ph/0702615v2

Phys.Rev.D80:123001,2009

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; v2: some references added

Scientific paper

10.1103/PhysRevD.80.123001

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.

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