New Early Dark Energy

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

New measurements of the expansion rate of the universe have plunged the standard model of cosmology into a severe crisis. In this letter we propose a simple resolution to the problem. We propose that a first order phase transition in a dark sector in the early universe, before recombination, can resolve the problem. This will lead to a short phase of a New Early Dark Energy (New EDE) component and can explain the observations. Fitting our model to measurements of the Cosmic Microwave Background, Baryonic Acoustic Oscillations, and supernovae yields a significant improvement of the best fit compared with the standard cosmological model without EDE at the cost of only two extra parameters. We find the mean value of the present Hubble parameter in the New EDE model to be $H_0=70.4 \pm 1.0 ~\textrm{km}\, \textrm{s}^{-1}\, \textrm{Mpc}^{-1}$.
Original language English arxiv.org Accepted/In press - 23. Oct 2019

dark energy
universe
cosmology
supernovae
sectors
microwaves
oscillations
expansion
acoustics

Bibliographical note

6 pages, 2 figures, 1 table, v2: LCDM bias on reionisation optical depth relaxed, minor improvements of manuscript, references added, plots and data table added

Cite this

@article{27afb740754f45beaf1edeee4904946b,
title = "New Early Dark Energy",
abstract = "New measurements of the expansion rate of the universe have plunged the standard model of cosmology into a severe crisis. In this letter we propose a simple resolution to the problem. We propose that a first order phase transition in a dark sector in the early universe, before recombination, can resolve the problem. This will lead to a short phase of a New Early Dark Energy (New EDE) component and can explain the observations. Fitting our model to measurements of the Cosmic Microwave Background, Baryonic Acoustic Oscillations, and supernovae yields a significant improvement of the best fit compared with the standard cosmological model without EDE at the cost of only two extra parameters. We find the mean value of the present Hubble parameter in the New EDE model to be $H_0=70.4 \pm 1.0 ~\textrm{km}\, \textrm{s}^{-1}\, \textrm{Mpc}^{-1}$.",
keywords = "astro-ph.CO, hep-ph, hep-th",
author = "Florian Niedermann and Sloth, {Martin S.}",
note = "6 pages, 2 figures, 1 table, v2: LCDM bias on reionisation optical depth relaxed, minor improvements of manuscript, references added, plots and data table added",
year = "2019",
month = "10",
day = "23",
language = "English",
journal = "arxiv.org",

}

In: arxiv.org, 23.10.2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - New Early Dark Energy

AU - Niedermann, Florian

AU - Sloth, Martin S.

N1 - 6 pages, 2 figures, 1 table, v2: LCDM bias on reionisation optical depth relaxed, minor improvements of manuscript, references added, plots and data table added

PY - 2019/10/23

Y1 - 2019/10/23

N2 - New measurements of the expansion rate of the universe have plunged the standard model of cosmology into a severe crisis. In this letter we propose a simple resolution to the problem. We propose that a first order phase transition in a dark sector in the early universe, before recombination, can resolve the problem. This will lead to a short phase of a New Early Dark Energy (New EDE) component and can explain the observations. Fitting our model to measurements of the Cosmic Microwave Background, Baryonic Acoustic Oscillations, and supernovae yields a significant improvement of the best fit compared with the standard cosmological model without EDE at the cost of only two extra parameters. We find the mean value of the present Hubble parameter in the New EDE model to be $H_0=70.4 \pm 1.0 ~\textrm{km}\, \textrm{s}^{-1}\, \textrm{Mpc}^{-1}$.

AB - New measurements of the expansion rate of the universe have plunged the standard model of cosmology into a severe crisis. In this letter we propose a simple resolution to the problem. We propose that a first order phase transition in a dark sector in the early universe, before recombination, can resolve the problem. This will lead to a short phase of a New Early Dark Energy (New EDE) component and can explain the observations. Fitting our model to measurements of the Cosmic Microwave Background, Baryonic Acoustic Oscillations, and supernovae yields a significant improvement of the best fit compared with the standard cosmological model without EDE at the cost of only two extra parameters. We find the mean value of the present Hubble parameter in the New EDE model to be $H_0=70.4 \pm 1.0 ~\textrm{km}\, \textrm{s}^{-1}\, \textrm{Mpc}^{-1}$.

KW - astro-ph.CO

KW - hep-ph

KW - hep-th

M3 - Journal article

JO - arxiv.org

JF - arxiv.org

ER -