Testing for double inflation with WMAP

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 & 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.

7 pages, 6 figures

References in corpus (8)

• The essence of quintessence and the cost of compression
• Multiple inflation and the WMAP 'glitches'
• Observational constraints on patch inflation in noncommutative spacetime
• Constraints on isocurvature models from the WMAP first-year data
• Constraints on the Primordial Power Spectrum from High Resolution Lyman-alpha Forest Spectra and WMAP
• Correlated isocurvature perturbations from mixed inflaton-curvaton decay
• Correlated adiabatic and isocurvature CMB fluctuations in the wake of the WMAP
• Reconstructing the Primordial Spectrum with CMB Temperature and Polarization

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