Particle production during Inflation with a non-minimally coupled spectator scalar field

Abstract

We study the inflationary model with a spectator scalar field $\chi$ coupled to both the inflaton and Ricci scalar. The interaction between the $\chi$ field and the gravity, denoted by $\xi R{\chi }^2$, can trigger the tachyonic instability of certain modes of the $\chi$ field. As a result, the $\chi$ field perturbations are amplified and serve as a gravitational wave (GW) source. When considering the backreaction of the $\chi$ field, an upper bound on the coupling parameter $\xi$ must be imposed to ensure that inflation does not end prematurely. In this case, we find that the inflaton's evolution experiences a sudden slowdown due to the production of $\chi$ particles, resulting in a unique oscillating structure in the power spectrum of curvature perturbations at specific scales. Moreover, the GW signal induced by the $\chi$ field is more significant than primordial GWs at around its peak scale, leading to a noticeable bump in the overall energy spectrum of GWs. It's worth noting that this bump predicted in the slow-roll inflationary scenario is unlikely to be detected by LISA and Taiji, but there is a slim chance it might approach the detection limits of GW experiments like BBO and SKA if we devise distinctive inflatonary potentials.

References in corpus (33)

• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Planck 2018 results. X. Constraints on inflation
• Towards the Theory of Reheating After Inflation
• The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
• BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
• Taiji Program: Gravitational-Wave Sources
• Science with the space-based interferometer LISA. IV: Probing inflation with gravitational waves
• The NANOGrav 11-year Data Set: Pulsar-timing Constraints On The Stochastic Gravitational-wave Background
• Science with the Square Kilometer Array: Motivation, Key Science Projects, Standards and Assumptions
• Large Nongaussianity in Axion Inflation
• Gauge Field Production in Axion Inflation: Consequences for Monodromy, non-Gaussianity in the CMB, and Gravitational Waves at Interferometers
• The NANOGrav Nine-year Data Set: Limits on the Isotropic Stochastic Gravitational Wave Background
• Particle production during inflation and gravitational waves detectable by ground-based interferometers
• Parity violation in the Cosmic Microwave Background from a pseudoscalar inflaton
• Phenomenology of a Pseudo-Scalar Inflaton: Naturally Large Nongaussianity
• Non-Gaussianities and chiral gravitational waves in natural steep inflation
• Trapped Inflation
• Primordial gravitational waves for universality classes of pseudoscalar inflation
• Rolling axions during inflation: perturbativity and signatures
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• Enhancing Inflationary Tensor Modes through Spectator Fields
• Primordial black holes and associated gravitational waves in axion monodromy inflation
• Effects of particle production during inflation
• Universal Constraints on Axions from Inflation
• Primordial black holes as dark matter and gravitational waves from bumpy axion inflation
• Backreaction and the Parametric Resonance of Cosmological Fluctuations
• How Well Can We Really Determine the Scale of Inflation?
• Rapid field excursions and the inflationary tensor spectrum
• Uncovering the History of Cosmic Inflation from Anomalies in Cosmic Microwave Background Spectra
• Irruption of massive particle species during inflation
• Late-time quantum backreaction of a very light nonminimally coupled scalar
• Generation of gravitational waves from symmetry restoration during inflation
• Understanding large scale CMB anomalies with the generalized non-minimal derivative coupling during inflation

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• Gravitational Waves from a Gauge Field Non-minimally Coupled to Gravity
• Gravitational Waves from Gauge Quanta Produced during Inflation
• Impact of particle production during inflation on the CMB detection