The initial conditions of the universe: how much isocurvature is allowed?
classification
🌌 astro-ph
gr-qchep-th
keywords
alloweddirectionsnon-adiabaticadiabaticbaryoncancellationsconditionsconstraints
read the original 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.
This paper has not been read by Pith yet.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.