Constraints on isocurvature models from the WMAP first-year data

Moodley, Kavilan; Bucher, M.; Dunkley, Joanna; Ferreira, Pedro G.; Skordis, Constantinos

doi:10.1103/physrevd.70.103520

Cited by 66 publications

(91 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a crucial aspect of this present work because previous analyses of correlated adiabatic and entropy (isocurvature) perturbations have always assumed power-law spectra for all the perturbations [26 -30]. When applied to the WMAP data they found that with standard priors on cosmological parameters the degree of correlation allowed is small (although see [33]). Allowing running of the spectral index, at least in the supersymmetric hybrid models we study, does not change this conclusion.…”

Section: Introductionmentioning

confidence: 86%

Testing for double inflation with WMAP

et al. 2005

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 86%

Testing for double inflation with WMAP

et al. 2005

View full text Add to dashboard Cite

show abstract

“…When one considers the most general primordial perturbation, including all isocurvature modes and their correlations it becomes much harder to exclude the possibility of a significant isocurvature contribution to the CMB angular power spectrum [273]. This is mainly due to the neutrino isocurvature velocity mode and there is no theoretical model of how a scale invariant spectrum for such a mode could be generated.…”

Section: B Neutrino Isocurvature Modesmentioning

confidence: 99%

Inflation dynamics and reheating

Bassett¹,

Tsujikawa²,

Wands³

2006

Rev. Mod. Phys.

994

1,329

View full text Add to dashboard Cite

We review the theory of inflation with single and multiple fields paying particular attention to the dynamics of adiabatic and entropy/isocurvature perturbations which provide the primary means of testing inflationary models. We review the theory and phenomenology of reheating and preheating after inflation providing a unified discussion of both the gravitational and nongravitational features of multi-field inflation. In addition we cover inflation in theories with extra dimensions and models such as the curvaton scenario and modulated reheating which provide alternative ways of generating large-scale density perturbations. Finally we discuss the interesting observational implications that can result from adiabatic-isocurvature correlations and non-Gaussianity.

show abstract

“…[34,35,36,39] and the CAMB package. The primordial adiabatic perturbation may be defined such that these correlated spectra have the opposite sign, as used in [40,41,43,44].…”

Section: Approachmentioning

confidence: 99%

Constraining isocurvature initial conditions with WMAP 3-year data

2006

View full text Add to dashboard Cite

We present constraints on the presence of isocurvature modes from the temperature and polarization CMB spectrum data from the WMAP satellite alone, and in combination with other datasets including SDSS galaxy survey and SNLS supernovae. We find that the inclusion of polarization data allows the WMAP data alone, as well as in combination with complementary observations, to place improved limits on the contribution of CDM and neutrino density isocurvature components individually. With general correlations, the upper limits on these sub-dominant isocurvature components are reduced to ∼60% of the first year WMAP results, with specific limits depending on the type of fluctuations. If multiple isocurvature components are allowed, however, we find that the data still allow a majority of the initial power to come from isocurvature modes. As well as providing general constraints we also consider their interpretation in light of specific theoretical models like the curvaton and double inflation.

show abstract

Constraints on isocurvature models from the WMAP first-year data

Cited by 66 publications

References 55 publications

Testing for double inflation with WMAP

Testing for double inflation with WMAP

Inflation dynamics and reheating

Constraining isocurvature initial conditions with WMAP 3-year data

Contact Info

Product

Resources

About