English

Testing dark energy after pre-recombination early dark energy

Cosmology and Nongalactic Astrophysics 2022-09-01 v2 General Relativity and Quantum Cosmology High Energy Physics - Theory

Abstract

In the studies on pre-recombination early dark energy (EDE), the evolution of Universe after recombination is usually regarded as ΛCDM{\Lambda}CDM-like, which corresponds that the equation of state of dark energy responsible for current accelerated expansion is w=1w=-1. However, in realistic models, ww might be evolving. We consider the parametrizations of ww with respect to the redshift zz in Axion-like EDE and AdS-EDE models, respectively. We performed the Monte Carlo Markov chain analysis with recent cosmological data, and found that the bestfit w(z)w(z) is compatible with w0=1,wa=0w_0=-1,w_a=0 (the cosmological constant) and the evolution of ww is only marginally favored, which so has little effect on lifting the bestfit value of H0{H_0}.

Keywords

Cite

@article{arxiv.2201.07079,
  title  = {Testing dark energy after pre-recombination early dark energy},
  author = {Hao Wang and Yun-Song Piao},
  journal= {arXiv preprint arXiv:2201.07079},
  year   = {2022}
}

Comments

18 pages, 7 figures

R2 v1 2026-06-24T08:53:57.304Z