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

50 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

Access to Document

10.1103/PhysRevLett.93.081301

Cite this

@article{d420ecd93ed54905859776c4e07d080c,

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.",

year = "2004",

month = aug,

day = "20",

doi = "10.1103/PhysRevLett.93.081301",

language = "English (US)",

volume = "93",

pages = "081301--1--081301--4",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "8",

}

TY - JOUR

T1 - Initial conditions of the universe

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.

UR - http://www.scopus.com/inward/record.url?scp=19544383583&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=19544383583&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.93.081301

DO - 10.1103/PhysRevLett.93.081301

M3 - Article

C2 - 15447170

AN - SCOPUS:19544383583

SN - 0031-9007

VL - 93

SP - 081301-1-081301-4

JO - Physical review letters

JF - Physical review letters

IS - 8

M1 - 081301

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this