Open and closed CDM isocurvature models contrasted with the CMB data

Details Open and closed CDM isocurvature models contrasted with the CMB data Open and closed CDM isocurvature models contrasted with the CMB data

2001-08-27

arxiv.org/abs/astro-ph/0108422v2

Phys.Rev.D65:043002,2002

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures. V2: Added a discussion of the effect of curvature scale on the primordial power spectrum and made minor ch

Scientific paper

10.1103/PhysRevD.65.043002

We consider pure isocurvature cold dark matter models in the case of open and closed universe. We allow for a large spectral tilt and scan the 6-dimensional parameter space for the best fit to the COBE, Boomerang, and Maxima-1 data. Taking into account constraints from large-scale structure and big bang nucleosynthesis, we find a best fit with $\chi^2 = 121$, which is to be compared to $\chi^2 = 44$ of a flat adiabatic reference model. Hence the current data strongly disfavour pure isocurvature perturbations.

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