The cosmological constant and the paradigm of adiabaticity

Details The cosmological constant and the paradigm of adiabaticity The cosmological constant and the paradigm of adiabaticity

2003-04-29

arxiv.org/abs/astro-ph/0304525v1

New Astron.Rev. 47 (2003) 769-774

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures, to appear in New Astronomy Reviews, Proceedings of the 2nd CMBNET Meeting, 20-21 February 2003, Oxford, UK

Scientific paper

We discuss the value of the cosmological constant as recovered from CMB and LSS data and the robustness of the results when general isocurvature initial conditions are allowed for, as opposed to purely adiabatic perturbations. The Bayesian and frequentist statistical approaches are compared. It is shown that pre-WMAP CMB and LSS data tend to be incompatible with a non-zero cosmological constant, regardless of the type of initial conditions and of the statistical approach. The non-adiabatic contribution is constrained to be < 40% (2sigma c.l.).

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