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

Preprint

21 January 2004

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0401417

Abstract

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.

Keywords

CORRELATED MIXTURES
DEGENERATE DIRECTIONS
INITIAL CONDITIONS
ISOCURVATURE
LARGER VALUES
PRIMORDIAL PERTURBATIONS
PRIORS ELUCIDATED
SPECTRAL TILT
SUBTLE FLAT
TOLERATE LARGE

All Related Versions

Version 1, 2004-01-21, ArXiv
Published version: Physical Review Letters, 93 (8), 081301.

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