Corpus ID: 237503225

Dark Energy at early times and ACT: a larger Hubble constant without late-time priors

@inproceedings{Poulin2021DarkEA,
  title={Dark Energy at early times and ACT: a larger Hubble constant without late-time priors},
  author={Vivian Poulin and Tristan L. Smith and Alexa Bartlett},
  year={2021}
}
Recent observations using the Atacama Cosmology Telescope (ACT) have provided ground-based cosmic microwave background (CMB) maps with higher angular resolution than the Planck satellite. These have the potential to put interesting constraints on models resolving the ‘Hubble tension’. In this paper we fit two models of Early Dark Energy (EDE) (an increase in the expansion rate around matter/radiation equality) to the combination of ACT data with large-scale measurements of the CMB either from… Expand
Testing AdS early dark energy with Planck, SPTpol, and LSS data
The Hubble tension might be resolved by injecting a new energy component, called Early Dark Energy (EDE), prior to recombination. An Anti-de Sitter (AdS) phase around recombination can make theExpand
The $H_0$ Olympics: A fair ranking of proposed models
Despite the remarkable success of the Λ Cold Dark Matter (ΛCDM) cosmological model, a growing discrepancy has emerged (currently measured at the level of ∼ 4 − 6σ) between the value of the HubbleExpand
The $H_0$ and $S_8$ tensions necessitate early and late time changes to $\Lambda$CDM
An only early or only late time alteration to ΛCDM has been inadequate at resolving both the H0 and S8 tensions simultaneously; however, a combination of early and late time alterations to ΛCDM canExpand
Late-transition vs smooth $H(z)$ deformation models for the resolution of the Hubble crisis
George Alestas, ∗ David Camarena, † Eleonora Di Valentino, ‡ Lavrentios Kazantzidis, § Valerio Marra, 5, 6, ¶ Savvas Nesseris, ∗∗ and Leandros Perivolaropoulos †† Department of Physics, University ofExpand

References

SHOWING 1-10 OF 94 REFERENCES
Early Dark Energy can Resolve the Hubble Tension.
TLDR
This work considers two physical models for this early dark energy EDE, one involving an oscillating scalar field and another a slowly rolling field, and performs a detailed calculation of the evolution of perturbations in these models. Expand
Dark energy at early times, the Hubble parameter, and the string axiverse
Precise measurements of the cosmic microwave background (CMB) power spectrum are in excellent agreement with the predictions of the standard $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ cosmologicalExpand
Dark sector to restore cosmological concordance
We develop a new phenomenological model that addresses current tensions between observations of the early and late Universe. Our scenario features: (i) a decaying dark energy fluid, which undergoes aExpand
Constraining Dark Matter-Dark Radiation interactions with CMB, BAO, and Lyman-α
Several interesting Dark Matter (DM) models invoke a dark sector leading to two types of relic particles, possibly interacting with each other: non-relativistic DM, and relativistic Dark RadiationExpand
Interacting Dark Sector and Precision Cosmology
We consider a recently proposed model in which dark matter interacts with a thermal background of dark radiation. Dark radiation consists of relativistic degrees of freedom which allow larger valuesExpand
Oscillating scalar fields and the Hubble tension: A resolution with novel signatures
We present a detailed investigation of a subdominant oscillating scalar field [“early dark energy” (EDE)] in the context of resolving the Hubble tension. Consistent with earlier work, but withoutExpand
Planck 2013 results. XVI. Cosmological parameters
This paper presents the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra. We find that the PlanckExpand
Quantifying discordance in the 2015 Planck CMB spectrum
We examine the internal consistency of the Planck 2015 cosmic microwave background (CMB) temperature anisotropy power spectrum. We show that tension exists between cosmological constant cold darkExpand
Linear cosmological constraints on 2-body decaying dark matter scenarios and robustness of the resolution to the $S_8$ tension
The ‘S8 tension’ is a longstanding discrepancy between the cosmological and local determination of the amplitude of matter fluctuations, parameterized as S8 ≡ σ8(Ωm/0.3), where σ8 is the root meanExpand
The Hubble tension in light of the Full-Shape analysis of Large-Scale Structure data
The disagreement between direct late-time measurements of the Hubble constant from the SH0ES collaboration, and early-universe measurements based on the ΛCDM model from the Planck collaborationExpand
...
1
2
3
4
5
...