Correlated perturbations from inflation and the cosmic microwave background

Details Correlated perturbations from inflation and the cosmic microwave background Correlated perturbations from inflation and the cosmic microwave background

2001-07-05

arxiv.org/abs/astro-ph/0107089v3

Phys.Rev.Lett.88:211302,2002

Astronomy and Astrophysics

Astrophysics

5 pages, revtex, 3 figures. V3 - DASI data added and reionization taken into account. New figure 2. Matches version to appear

Scientific paper

10.1103/PhysRevLett.88.211302

We compare the latest cosmic microwave background data with theoretical predictions including correlated adiabatic and CDM isocurvature perturbations with a simple power-law dependence. We find that there is a degeneracy between the amplitude of correlated isocurvature perturbations and the spectral tilt. A negative (red) tilt is found to be compatible with a larger isocurvature contribution. Estimates of the baryon and CDM densities are found to be almost independent of the isocurvature amplitude. The main result is that current microwave background data do not exclude a dominant contribution from CDM isocurvature fluctuations on large scales.

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