Cosmological consequences of a scalar field with oscillating equation of state. IV. Primordial nucleosynthesis and the deuterium problem
arXiv:2302.12512 · doi:10.1103/PhysRevD.106.043524
Abstract
We study the primordial nucleosynthesis (BBN) in the stepwise scalar field model proposed by Tián [arXiv:1912.13208, Phys. Rev. D 101, 063531 (2020)], which provides a multiaccelerating Universe solution to the cosmological coincidence problem and predicts that the scalar field may be non-negligible even in the early Universe. The observed abundances of the light elements can be used to constrain the energy density of the scalar field during the BBN era. We present a public \texttt{Matlab} code to implement the BBN calculation in the stepwise scalar field model. We show that the model can survive the BBN constraints. In particular, this model incorporates a new solution to the possible deuterium problem: very early dark energy that appears at the end of BBN. In addition, the BBN constraints, along with constraints from the cosmic late-time acceleration, suggest that the Universe in the radiation era evolves in a chaotic accelerating manner, rather than an oscillating scaling manner.
14 pages, 4 figures, published in Phys. Rev. D
References in corpus (16)
- Dark Energy and the Accelerating Universe
- BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
- Cosmological Evolution of a Quintom Model of Dark Energy
- The Primordial Lithium Problem
- The oscillating dark energy: future singularity and coincidence problem
- A new tension in the cosmological model from primordial deuterium?
- Improving Helium Abundance Determinations with Leo P as a Case Study
- Primordial Deuterium after LUNA: concordances and error budget
- The Impact of New d(p,γ)He3 Rates on Big Bang Nucleosynthesis
- Probing the Early Universe with Axion Physics and Gravitational Waves
- Features in Dark Energy Equation of State and Modulations in the Hubble Diagram
- Resolving conclusions about the early Universe requires accurate nuclear measurements
- Primordial nucleosynthesis with varying fundamental constants: Solutions to the Lithium problem and the Deuterium discrepancy
- Cosmological consequences of a scalar field with oscillating equation of state: A possible solution to the fine-tuning and coincidence problems
- Cosmological consequences of a scalar field with oscillating equation of state. II. Oscillating scaling and chaotic accelerating solutions
- Cosmological consequences of a scalar field with oscillating equation of state. III. Unifying inflation with dark energy and small tensor-to-scalar ratio