Flat Tree-level Inflationary Potentials in Light of CMB and LSS Data
arXiv:0711.3436 · doi:10.1088/1475-7516/2008/03/018
Abstract
We use cosmic microwave background and large scale structure data to test a broad and physically well-motivated class of inflationary models: those with flat tree-level potentials (typical in supersymmetry). The non-trivial features of the potential arise from radiative corrections which give a simple logarithmic dependence on the inflaton field, making the models very predictive. We also consider a modified scenario with new physics beyond a certain high-energy cut-off showing up as non-renormalizable operators (NRO) in the inflaton field. We find that both kinds of models fit remarkably well CMB and LSS data, with very few free parameters. Besides, a large part of these models naturally predict a reasonable number of e-folds. A robust feature of these scenarios is the smallness of tensor perturbations (r < 10^{-3}). The NRO case can give a sizeable running of the spectral index while achieving a sufficient number of e-folds. We use Bayesian model comparison tools to assess the relative performance of the models. We believe that these scenarios can be considered as a standard physical class of inflationary models, on a similar footing with monomial potentials.
42 LaTeX pages, 8 figures
References in corpus (30)
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- Cosmological parameters from CMB and other data: a Monte-Carlo approach
- Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
- Particle Physics Models of Inflation and the Cosmological Density Perturbation
- Cosmological Constraints from the SDSS Luminous Red Galaxies
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Implications for Inflation
- Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
- Reconstructing the Inflaton Potential --- an Overview
- Baryogenesis from Flat Directions of the Supersymmetric Standard Model
- Formalising the Slow-Roll Approximation in Inflation
- Statistics: Handle with Care, Detecting Multiple Model Components with the Likelihood Ratio Test
- D-Term Inflation
- Applications of Bayesian model selection to cosmological parameters
- Extended Mosaic Observations with the Cosmic Background Imager
- Gauge invariant MSSM inflaton
- Flat directions in the scalar potential of the supersymmetric standard model
- A Measurement of the CMB <EE> Spectrum from the 2003 Flight of BOOMERANG
- MSSM flat direction inflation: slow roll, stability, fine tunning and reheating
- Cosmological parameter estimation and the inflationary cosmology
- Reconstructing the Inflaton Potential---in Principle and in Practice
- Measuring the effective complexity of cosmological models
- Inflation models and observation
- Improved Measurements of the CMB Power Spectrum with ACBAR
- Bayesian Calibrated Significance Levels Applied to the Spectral Tilt and Hemispherical Asymmetry
- Forecasting the Bayes factor of a future observation
- Inflation models after WMAP year three
- How robust are inflation model and dark matter constraints from cosmological data?
- How to fool CMB parameter estimation
- New constraints on the observable inflaton potential from WMAP and SDSS
- Running Spectral Index as a Probe of Physics at High Scales
Cited by in corpus (13)
- Bayes in the sky: Bayesian inference and model selection in cosmology
- Bayesian Analysis of Inflation: Parameter Estimation for Single Field Models
- Hunting Down the Best Model of Inflation with Bayesian Evidence
- Reconstructing a general inflationary action
- Single-field inflation constraints from CMB and SDSS data
- Cosmological constraints on general, single field inflation
- Radiative plateau inflation
- Joint Planck and WMAP Assessment of Low CMB Multipoles
- A Bayesian analysis of inflationary primordial spectrum models using Planck data
- Inflation that runs naturally: Gravitational waves and suppression of power at large and small scales
- Large tensor-to-scalar ratio and running of the scalar spectral index with Instep Inflation
- Probing the primordial power spectra with inflationary priors
- Reducing the Tension Between the BICEP2 and the Planck Measurements: A Complete Exploration of the Parameter Space