Particle production during inflation: A Bayesian analysis with CMB data from Planck 2018

Abstract

A class of inflationary models that involve rapid bursts of particle productions predict observational signatures, such as bump-like features in the primordial scalar power spectrum. In this work, we analyze such models by comparing their predictions with the latest CMB data from Planck 2018. We consider two scenarios of particle production. The first one is a simple scenario consisting of a single burst of particle production during observable inflation. The second one consists of multiple bursts of particle production that lead to a series of bump-like features in the primordial power spectrum. We find that the second scenario of the multi-bump model gives better fit to the CMB data compared to the concordance $\Lambda$CDM model. We carried out model comparisons using Bayesian evidences. From the observational constraints on the amplitude of primordial features of the multi-bump model, we find that the coupling parameter $g$ responsible for particle production is bound to be $g<0.05$.

Revised to match the published version, results unchanged

References in corpus (17)

• Monodromy in the CMB: Gravity Waves and String Inflation
• Generating PBHs and small-scale GWs in two-field models of inflation
• Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation
• Strongly Coupled Perturbations in Two-Field Inflationary Models
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• Probing Primordial Features with the Stochastic Gravitational Wave Background
• On Features and Nongaussianity from Inflationary Particle Production
• Models of the Primordial Standard Clock
• Wiggly Whipped Inflation
• Precise measurements of inflationary features with 21 cm observations
• 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
• Comparing multi-field primordial feature models with the Planck data
• Large Scale Structure Forecast Constraints on Particle Production During Inflation
• Large Field Inflation Models from Higher-Dimensional Gauge Theories
• Large Field Excursions from Dimensional (De)construction