Initial conditions of the universe: How much isocurvature is allowed?

M. Bucher, J. Dunkley, P. G. Ferreira, K. Moodley, C. Skordis

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Various constraints on correlated mixtures of adiabatic and nonadiabatic primordial perturbations, were investigated. Flat directions in parameter space which tolerate large fractions of nonadiabatic fluctuations were discovered. A Markov Chain Monte Carlo method was employed to sample parameter space, using Metropolis algorithm. The posterior distribution was sampled quickly and accurately with an efficient distribution using a scaled covariance matrix of the posterior.

Original languageEnglish (US)
Article number081301
Pages (from-to)081301-1-081301-4
JournalPhysical review letters
Issue number8
StatePublished - Aug 20 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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