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Title: Acoustic dark energy: Potential conversion of the Hubble tension

Journal Article · · Physical Review D
ORCiD logo [1];  [2];  [3];  [3]
  1. Univ. of Chicago, IL (United States). Enrico Fermi Inst.; Univeristy of Chicago
  2. Univ. of Chicago, IL (United States). Enrico Fermi Inst.; Istituto Nazionale di Fisica Nucleare (INFN), Padov (Italy); Univ. degli Studi di Padova (Italy)
  3. Univ. of Chicago, IL (United States). Enrico Fermi Inst.

We discuss the ability of a dark fluid becoming relevant around the time of matter radiation equality to significantly relieve the tension between local measurements of the Hubble constant and CMB inference, within the $$Λ$$ CDM model. We show that the gravitational impact of acoustic oscillations in the dark fluid balance the effects on the CMB and result in an improved fit to CMB measurements themselves while simultaneously raising the Hubble constant. The required balance favors a model where the fluid is a scalar field that converts its potential to kinetic energy around matter radiation equality which then quickly redshifts away. We derive the requirements on the potential for this conversion mechanism and find that a simple canonical scalar with twofree parameters for its local slope and amplitude robustly improves the fit to the combined data by $Δχ2 ≈ 12.7$ over $$Λ$$CDM. We uncover the CMB polarization signatures that can definitively test this scenario with future data.

Research Organization:
Univ. of Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
SC0009924
OSTI ID:
1593832
Journal Information:
Physical Review D, Journal Name: Physical Review D Journal Issue: 6 Vol. 100; ISSN PRVDAQ; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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The BAO+BBN take on the Hubble tension journal October 2019
Cosmological discordances. III. More on measure properties, large-scale-structure constraints, the Hubble constant and Planck data journal December 2019
How sound are our ultralight axion approximations? journal January 2020
Hubble constant hunter’s guide journal February 2020
Oscillating scalar fields and the Hubble tension: A resolution with novel signatures journal March 2020
Cosmic Expansion History from Line-Intensity Mapping journal December 2019
Gravitational Waves, CMB Polarization, and the Hubble Tension journal January 2020
Analytic Calculation of Covariance between Cosmological Parameters from Correlated Data Sets, with an Application to SPTpol journal December 2019
The Cosmic Expansion History from Line-Intensity Mapping text January 2019
Cosmological discordances III: more on measure properties, Large-Scale-Structure constraints, the Hubble constant and Planck text January 2019