Effect of damped oscillations in the inflationary potential

Abstract

We investigate the effect of damped oscillations on a nearly flat inflationary potential and the features they produce in the power-spectrum and bi-spectrum. We compare the model with the Planck data using Plik unbinned and CamSpec clean likelihood and we are able to obtain noticeable improvement in fit compared to the power-law $\Lambda$CDM model. We are able to identify three plausible candidates each for the two likelihoods used. We find that the best-fit to Plik and CamSpec likelihoods match closely to each other. The improvement comes from various possible outliers at the intermediate to small scales. We also compute the bi-spectrum for the best-fits. At all limits, the amplitude of bi-spectrum, $f_{NL}$ is oscillatory in nature and its peak value is determined by the amplitude and frequency of the oscillations in the potential, as expected. We find that the bi-spectrum consistency relation strictly holds at all scales in all the best-fit candidates.

21 pages, 11 figures and 5 tables

References in corpus (28)

• Primordial Non-Gaussianities from Inflation Models
• Gauge invariant MSSM inflaton
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Inflation and WMAP three year data: Features have a Future!
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• New Constraints on Oscillations in the Primordial Spectrum of Inflationary Perturbations
• Folded Resonant Non-Gaussianity in General Single Field Inflation
• The Euclid mission design
• Oscillations in the inflaton potential?
• Primordial power spectrum from Planck
• Models of the Primordial Standard Clock
• Estimation of Primordial Spectrum with post-WMAP 3 year data
• Features in the Primordial Spectrum from WMAP: A Wavelet Analysis
• 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
• On the scalar consistency relation away from slow roll
• One spectrum to cure them all: Signature from early Universe solves major anomalies and tensions in cosmology
• Generating primordial features at large scales in two field models of inflation
• Uncovering the History of Cosmic Inflation from Anomalies in Cosmic Microwave Background Spectra
• Primordial Standard Clock Models and CMB Residual Anomalies
• Discordances in cosmology and the violation of slow-roll inflationary dynamics
• Inflation After False Vacuum Decay: New Evidence from BICEP2
• Changes in the halo formation rates due to features in the primordial spectrum
• Constraints on features in the inflationary potential from future Euclid data
• The scalar bi-spectrum during preheating in single field inflationary models
• Sharp inflaton potentials and bi-spectra: Effects of smoothening the discontinuity

Cited by in corpus (7)

• One spectrum to cure them all: Signature from early Universe solves major anomalies and tensions in cosmology
• Discordances in cosmology and the violation of slow-roll inflationary dynamics
• Back to the features: assessing the discriminating power of future CMB missions on inflationary models
• Circumventing the challenges in the choice of the non-conformal coupling function in inflationary magnetogenesis
• A search for super-imposed oscillations to the primordial power spectrum in Planck and SPT-3G 2018 data
• Amplifying quantum discord during inflationary magnetogenesis through violation of parity
• Reconstructing square-law k-inflation from Planck data