Constraining Early Dark Energy cosmological models with Big Bang Nucleosynthesis

Abstract

The recent cosmological picture contains a significant tension indicating that our standard $\Lambda$CDM picture may be incomplete. Early Dark Energy models can alleviate the Hubble tension, by assuming an early acceleration that could explain the divergence between the early and late-time cosmological data. We investigate the implications of Early Dark Energy models on the Big Bang Nucleosynthesis processes by considering several cosmological models, including a model assuming a simple cosmological constant, alongside with varying equations of state dark energy models. We construct a simulator through a nested sampling algorithm, with the help of which we estimate the upper bounds for model parameters, and determine the maximum allowable dark energy density contribution during the radiation-dominated era. Our results are obtained through the \href{https://github.com/croi900/eden}{eden} program. We show that for a linear or polytropic equation of state, the dark energy density is constrained to less than $10^{-13}$ MeV${}^4$ and $10^{-5}$ MeV${}^4$, respectively, at the 95\% confidence level. Furthermore, we identify a temperature-dependent equation of state of dark energy as the most physically compelling framework, which remains consistent with primordial abundances for coupling parameters $\lesssim 10^{-2}$. This model successfully allows for high-temperature deviations from the standard $\Lambda$CDM expansion history, while rapidly diluting to obtain standard general relativistic results in the weak freeze-out era.

19 pages, 18 figures, accepted for publication in Physics of the Dark Universe

References in corpus (17)

• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Primordial Nucleosynthesis in the Precision Cosmology Era
• The $H_0$ Olympics: A fair ranking of proposed models
• The Primordial Lithium Problem
• Early dark energy, the Hubble-parameter tension, and the string axiverse
• Early modified gravity in light of the $H_0$ tension and LSS data
• Big Bang Nucleosynthesis and Entropy Evolution in $f(R,T)$ Gravity
• Probing Early Modification of Gravity with Planck, ACT and SPT
• Is Dark Energy Dynamical in the DESI Era? A Critical Review
• Cosmology-marginalized approaches in Bayesian model comparison: the neutrino mass as a case study
• Robust evidence for dynamical dark energy in light of DESI DR2 and joint ACT, SPT, and Planck data
• Observational evidence for Early Dark Energy as a unified explanation for Cosmic Birefringence and the Hubble tension
• Big Bang Nucleosynthesis constraints on the cosmological evolution in a Universe with a Weylian Boundary
• Early Dark Energy During Big Bang Nucleosynthesis
• New Bounds on Heavy QCD Axions from Big Bang Nucleosynthesis
• BBN Constraints on the Hadronic Annihilation of sub-GeV Dark Matter
• Big Bang Nucleosynthesis constraints on space-time noncommutativity