Inflation Story: slow-roll and beyond
arXiv:2107.09460 · doi:10.1088/1475-7516/2021/12/038
Abstract
We present constraints on inflationary dynamics and features in the primordial power spectrum of scalar perturbations using the Cosmic Microwave Background temperature, polarization data from Planck 2018 data release and updated likelihoods. We constrain the slow-roll dynamics using Hilltop Quartic Potential and Starobinsky model in the Einstein frame using the Planck 2018 binned Plik likelihood. Using the Hilltop as base potential we construct Whipped Inflation potential to introduce suppression in the scalar power spectrum at large angular scales. We notice marginal (68% C.L.) preference of suppression from the large scale temperature angular power spectrum. However, large-scale E-mode likelihood, based on high frequency instrument cross spectrum, does not support this suppression and in the combined data the preference towards the suppression becomes negligible. Based on the Hilltop and Starobinsky model we construct the Wiggly Whipped Inflation potentials to introduce oscillatory features along with the suppression. We use unbinned data from the recently released CamSpec v12.5 likelihood which updates Planck 2018 results. We compare the Bayesian evidences of the feature models with their baseline slow-roll potentials. We find that the complete slow-roll baseline potential is moderately preferred against potentials which generate features. Compared to Planck 2015 PlikHM bin1 likelihood, we find that the significance of sharp features has decreased owing to the updates in the data analysis pipeline. We also compute the bispectra for the best fit candidates obtained from our analysis.
v1: 43 pages, 18 figures and 8 tables; v2: minor changes, matches the version published in JCAP
References in corpus (33)
- BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
- Primordial Non-Gaussianities from Inflation Models
- PolyChord: nested sampling for cosmology
- Gauge invariant MSSM inflaton
- Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
- Generating PBHs and small-scale GWs in two-field models of inflation
- Inflation and WMAP three year data: Features have a Future!
- LiteBIRD: JAXA's new strategic L-class mission for all-sky surveys of cosmic microwave background polarization
- Strongly Coupled Perturbations in Two-Field Inflationary Models
- New Universal Local Feature in the Inflationary Perturbation Spectrum
- Folded Resonant Non-Gaussianity in General Single Field Inflation
- The Euclid mission design
- Probing Primordial Features with the Stochastic Gravitational Wave Background
- Oscillations in the inflaton potential?
- Primordial power spectrum from Planck
- Models of the Primordial Standard Clock
- Model selection applied to reconstruction of the Primordial Power Spectrum
- Wiggly Whipped Inflation
- Standard Clock in Primordial Density Perturbations and Cosmic Microwave Background
- Estimation of Primordial Spectrum with post-WMAP 3 year data
- Whipped inflation
- Reconstruction of the Primordial Power Spectrum using Temperature and Polarisation Data from Multiple Experiments
- Is a step in the primordial spectral index favored by CMB data ?
- Combining power spectrum and bispectrum measurements to detect oscillatory features
- Numerical evaluation of the bispectrum in multiple field inflation
- Searching for Standard Clocks in the Primordial Universe
- On the scalar consistency relation away from slow roll
- The Search For Primordial Tensor Modes
- Comparing multi-field primordial feature models with the Planck data
- Inflation After False Vacuum Decay: New Evidence from BICEP2
- Changes in the halo formation rates due to features in the primordial spectrum
- The scalar bi-spectrum during preheating in single field inflationary models
- Sharp inflaton potentials and bi-spectra: Effects of smoothening the discontinuity