Cosmological consequences of a scalar field with oscillating equation of state. III. Unifying inflation with dark energy and small tensor-to-scalar ratio

Abstract

We investigate the inflationary consequences of the oscillating dark energy model proposed by Tián [\href{https://doi.org/10.1103/PhysRevD.101.063531}{Phys. Rev. D {\bf 101}, 063531 (2020)}], which aims to solve the cosmological coincidence problem with multi-accelerating Universe (MAU). We point out that the inflationary dynamics belong to slow-roll inflation. The spectral index of scalar perturbations and the tensor-to-scalar ratio $r$ are shown to be consistent with current \textit{Planck} measurements. Especially, this model predicts $r\sim 10^{-7}$, which is far below the observation limits. This result motivates us to explore the smallness of $r$ in the general MAU. We propose a quintessential generalization of the original model and prove $r<0.01$ in general. The null detection to date of primordial gravitational waves provides a circumstantial evidence for the MAU. After the end of inflation, the scalar field rolls toward infinity instead of a local minimum, and meanwhile its equation of state is oscillating with an average value larger than $1/3$. In this framework, we show that gravitational particle creation at the end of inflation is capable of reheating the Universe.

arXiv comment8 pages, 3 figures, published in Phys. Rev. D

References in corpus (47)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Quintessence, Cosmic Coincidence, and the Cosmological Constant
• The Cosmological Constant
• Planck 2018 results. X. Constraints on inflation
• The Standard Model Higgs boson as the inflaton
• Towards the Theory of Reheating After Inflation
• Dark Energy and the Accelerating Universe
• Reheating after Inflation
• Cosmological Tracking Solutions
• Exponential potentials and cosmological scaling solutions
• Encyclopaedia Inflationaris
• Inflation Dynamics and Reheating
• Reconstructing the Inflaton Potential --- an Overview
• The Cold Dark Matter Density Perturbation
• Formalising the Slow-Roll Approximation in Inflation
• Quintessential inflation
• BICEP2 / Keck Array x: Constraints on Primordial Gravitational Waves using Planck, WMAP, and New BICEP2/Keck Observations through the 2015 Season
• COBE, Gravitational Waves, Inflation and Extended Inflation
• Oscillating Quintom and the Recurrent Universe
• First CMB Constraints on the Inflationary Reheating Temperature
• Deflationary Universe Scenario
• Quintom models with an equation of state crossing -1
• Electroweak Baryogenesis and the Expansion Rate of the Universe
• Solving the Coincidence Problem: Tracking Oscillating Energy
• Gravitational waves constraints on post-inflationary phases stiffer than radiation
• Reconstructing the Inflaton Potential---in Principle and in Practice
• The oscillating dark energy: future singularity and coincidence problem
• Modeling Quintessential Inflation
• Probing Primordial Gravitational Waves: Ali CMB Polarization Telescope
• The Dark Universe
• Everpresent Lambda
• Constraints on Oscillating Quintom from Supernova, Microwave Background and Galaxy Clustering
• Measurements of B-mode Polarization of the Cosmic Microwave Background from 500 Square Degrees of SPTpol Data
• Inflationary predictions for scalar and tensor fluctuations reconsidered
• Observational Constraints on Oscillating Dark-Energy Parametrizations
• Features in Dark Energy Equation of State and Modulations in the Hubble Diagram
• A Standard Ruler at Cosmic Dawn
• Toward a Possible Solution to the Cosmic Coincidence Problem
• Structure formation in cosmologies with oscillating dark energy
• Implications of the possible 21-cm line excess at cosmic dawn on dynamics of interacting dark energy
• Early dark energy in $k$-essence
• Cosmological consequences of a scalar field with oscillating equation of state: A possible solution to the fine-tuning and coincidence problems
• Understanding gravitational particle production in quintessential inflation
• Oscillating Universe from inhomogeneous EoS and coupled dark energy
• Cosmological consequences of a scalar field with oscillating equation of state. II. Oscillating scaling and chaotic accelerating solutions
• Quintessence models with an oscillating equation of state and their potentials

Cited by in corpus (4)

• Oscillating dark energy in light of the latest observations and its impact on the Hubble tension
• Inflation and the cosmological (not-so) constant in unimodular gravity
• Constraining the quintessential $\alpha$-attractor inflation through dynamical horizon exit method
• Cosmological consequences of a scalar field with oscillating equation of state. IV. Primordial nucleosynthesis and the deuterium problem