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Acoustic dark energy: Potential conversion of the Hubble tension
Abstract
We discuss the ability of a dark fluid becoming relevant around the time of matter radiationequality to significantly relieve the tension between local measurements of the Hubble constantand CMB inference, within the $Λ$ CDM model. We show that the gravitational impact of acousticoscillations 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 requiredbalance favors a model where the fluid is a scalar field that converts its potential to kinetic energyaround matter radiation equality which then quickly redshifts away. We derive the requirementson 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 testthis scenario with future data.
- Authors:
-
[1];
- Univ. of Chicago, IL (United States). Enrico Fermi Inst.
- Univ. of Chicago, IL (United States). Enrico Fermi Inst.; Istituto Nazionale di Fisica Nucleare (INFN), Padov (Italy); Univ. degli Studi di Padova (Italy)
- Publication Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- OSTI Identifier:
- 1593832
- Alternate Identifier(s):
- OSTI ID: 1593837
- Grant/Contract Number:
- SC0009924
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 6; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Cosmic microwave background; Cosmological parameters; Dark energy
Citation Formats
Lin, Meng-Xiang, Benevento, Giampaolo, Hu, Wayne, and Raveri, Marco. Acoustic dark energy: Potential conversion of the Hubble tension. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.100.063542.
Lin, Meng-Xiang, Benevento, Giampaolo, Hu, Wayne, & Raveri, Marco. Acoustic dark energy: Potential conversion of the Hubble tension. United States. doi:10.1103/PhysRevD.100.063542.
Lin, Meng-Xiang, Benevento, Giampaolo, Hu, Wayne, and Raveri, Marco. Fri .
"Acoustic dark energy: Potential conversion of the Hubble tension". United States. doi:10.1103/PhysRevD.100.063542.
@article{osti_1593832,
title = {Acoustic dark energy: Potential conversion of the Hubble tension},
author = {Lin, Meng-Xiang and Benevento, Giampaolo and Hu, Wayne and Raveri, Marco},
abstractNote = {We discuss the ability of a dark fluid becoming relevant around the time of matter radiationequality to significantly relieve the tension between local measurements of the Hubble constantand CMB inference, within the $Λ$ CDM model. We show that the gravitational impact of acousticoscillations 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 requiredbalance favors a model where the fluid is a scalar field that converts its potential to kinetic energyaround matter radiation equality which then quickly redshifts away. We derive the requirementson 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 testthis scenario with future data.},
doi = {10.1103/PhysRevD.100.063542},
journal = {Physical Review D},
number = 6,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}
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