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

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

doi:10.1103/PhysRevLett.93.081301

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 journal › Article › peer-review

51 Scopus citations

Abstract

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 language	English (US)
Article number	081301
Pages (from-to)	081301-1-081301-4
Journal	Physical review letters
Volume	93
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.93.081301
State	Published - Aug 20 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.93.081301

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title = "Initial conditions of the universe: How much isocurvature is allowed?",

abstract = "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.",

author = "M. Bucher and J. Dunkley and Ferreira, \{P. G.\} and K. Moodley and C. Skordis",

note = "Funding Information: M. B. thanks D. Avery for financial support. J. D. and K. M. acknowledge the support of PPARC. P. G. F. thanks the Royal Society. C. S. is supported by a Leverhulme trust grant. We thank R. Durrer, U. Seljak, D. Spergel, and R. Trotta for useful discussions.",

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doi = "10.1103/PhysRevLett.93.081301",

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T2 - How much isocurvature is allowed?

AU - Bucher, M.

AU - Dunkley, J.

AU - Ferreira, P. G.

AU - Moodley, K.

AU - Skordis, C.

N1 - Funding Information: M. B. thanks D. Avery for financial support. J. D. and K. M. acknowledge the support of PPARC. P. G. F. thanks the Royal Society. C. S. is supported by a Leverhulme trust grant. We thank R. Durrer, U. Seljak, D. Spergel, and R. Trotta for useful discussions.

PY - 2004/8/20

Y1 - 2004/8/20

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevLett.93.081301

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JO - Physical review letters

JF - Physical review letters

IS - 8

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ER -

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

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All Science Journal Classification (ASJC) codes

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