Cold New Early Dark Energy pulls the trigger on the H 0 and S 8 tensions: a simultaneous solution to both tensions without new ingredients

Juan S. Cruz*, Florian Niedermann, Martin S. Sloth

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

18 Downloads (Pure)

Abstract

In this work, we show that the Cold New Early Dark Energy (Cold NEDE) model in its original form can solve both the Hubble tension and the S 8 tension without adding any new ingredients at the fundamental level. So far, it was assumed that the trigger field in the Cold NEDE model is completely subdominant. However, relaxing this assumption and letting the trigger field contribute a mere 0.5% of the total energy density leads to a resolution of the S 8 tension while simultaneously improving it as a solution to the H 0 tension. Fitting this model to baryonic acoustic oscillations, large-scale-structure, supernovae (including a SH0ES prior), and cosmic microwave background data, we report a preferred NEDE fraction of f NEDE = 0.134+0.032-0.025 (68% C.L.), lifting its Gaussian evidence for the first time above 5σ (up from 4σ when the trigger contribution to dark matter is negligible). At the same time, we find the new concordance values H 0 = 71.71 ± 0.88 km sec-1 Mpc-1 and S 8 = 0.793 ± 0.018. Excluding large-scale structure data and the SH0ES prior, both Gaussian tensions are reduced below the 2σ level.

Original languageEnglish
Article number033
JournalJournal of Cosmology and Astroparticle Physics
Volume2023
Issue number11
Number of pages35
ISSN1475-7516
DOIs
Publication statusPublished - 1. Nov 2023

Keywords

  • axions
  • cosmological parameters from CMBR
  • dark energy theory
  • dark matter theory

Fingerprint

Dive into the research topics of 'Cold New Early Dark Energy pulls the trigger on the H 0 and S 8 tensions: a simultaneous solution to both tensions without new ingredients'. Together they form a unique fingerprint.

Cite this