Testing for double inflation with WMAP

Parkinson, David, Tsujikawa, Shinji, Bassett, Bruce A. and Amendola, Luca (2005) Testing for double inflation with WMAP. Physical Review D, 71 6: 1-7. doi:10.1103/PhysRevD.71.063524

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Author Parkinson, David
Tsujikawa, Shinji
Bassett, Bruce A.
Amendola, Luca
Title Testing for double inflation with WMAP
Journal name Physical Review D   Check publisher's open access policy
ISSN 0556-2821
1089-4918
Publication date 2005-03
Sub-type Article (original research)
DOI 10.1103/PhysRevD.71.063524
Open Access Status File (Publisher version)
Volume 71
Issue 6
Start page 1
End page 7
Total pages 7
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract With the WMAP data we can now begin to test realistic models of inflation involving multiple scalar fields. These naturally lead to correlated adiabatic and isocurvature (entropy) perturbations with a running spectral index. We present the first full (9 parameter) likelihood analysis of double inflation with WMAP data and find that despite the extra freedom, supersymmetric hybrid potentials are strongly constrained with less than 7% correlated isocurvature component allowed when standard priors are imposed on the cosomological parameters. As a result we also find that Akaike and Bayesian model selection criteria rather strongly prefer single-field inflation, just as equivalent analysis prefers a cosmological constant over dynamical dark energy in the late universe. It appears that simplicity is the best guide to our universe.
Keyword Primordial power spectrum
Density perturbations
Cosmological perturbations
2-field inflation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Science Publications
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Created: Mon, 28 Feb 2011, 09:47:08 EST