Bounds on Isocurvature Perturbations from CMB and LSS

Details Bounds on Isocurvature Perturbations from CMB and LSS Bounds on Isocurvature Perturbations from CMB and LSS

2004-06-22

arxiv.org/abs/astro-ph/0406488v1

Astronomy and Astrophysics

Astrophysics

Proceedings of Astroparticle and High Energy Physics (AHEP 2003), Valencia, October 14-18, 2003, and Exploring the Universe (M

Scientific paper

Using both cosmic microwave background and large scale structure data, we put stringent bounds on the possible cold dark matter, baryon and neutrino isocurvature contributions to primordial fluctuations in the Universe. Neglecting the possible effects of spatial curvature, tensor perturbations and reionization, we perform a Bayesian likelihood analysis with nine free parameters, and find that the relative amplitude of the isocurvature component cannot be larger than about a few percent for uncorrelated models. On the other hand, for correlated adiabatic and isocurvature components, the ratio could be slightly larger. However, the cross-correlation coefficient is strongly constrained, and maximally correlated/anticorrelated models are disfavored.

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