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

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

2004-01-21

arxiv.org/abs/astro-ph/0401417v1

Phys.Rev.Lett. 93 (2004) 081301

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures. Submitted to PRL

Scientific paper

10.1103/PhysRevLett.93.081301

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.

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