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Article Dans Une Revue Physical Review Letters Année : 2004

The initial conditions of the universe: how much isocurvature is allowed?

J. Dunkley
  • Fonction : Auteur
P. G. Ferreira
  • Fonction : Auteur
K. Moodley
C. Skordis
  • Fonction : Auteur

Résumé

We investigate the constraints imposed by the current data on correlated mixtures of adiabatic and non-adiabatic primordial perturbations. We discover subtle flat directions in parameter space that tolerate large (~60%) contributions of non-adiabatic fluctuations. In particular, larger values of the baryon density and a spectral tilt are allowed. The cancellations in the degenerate directions are explored and the role of priors elucidated.

Dates et versions

hal-00285107 , version 1 (04-06-2008)

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M. Bucher, J. Dunkley, P. G. Ferreira, K. Moodley, C. Skordis. The initial conditions of the universe: how much isocurvature is allowed?. Physical Review Letters, 2004, 93, pp.081301. ⟨hal-00285107⟩
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