Early dark sector, the Hubble tension, and the swampland
Abstract
We consider the interplay of the Early Dark Energy (EDE) model, the Swampland Distance Conjecture (SDC), and cosmological parameter tensions. EDE is a proposed resolution of the Hubble tension relying upon a near-Planckian scalar field excursion, while the SDC predicts an exponential sensitivity of masses of other fields to such an excursion, m ∝ e–c|ΔΦ|/Mpl with c ~ 0(1). Meanwhile, EDE is in tension with large-scale structure (LSS) data, due to shifts in the standard ΛCDM parameters necessary to fit the cosmic microwave background (CMB). One might hope that a proper treatment of the model, e.g., accounting for the SDC, may ameliorate the tension with LSS. Motivated by these considerations, we introduce the Early Dark Sector (EDS) model, wherein the mass of dark matter is exponentially sensitive to super-Planckian field excursions of the EDE scalar. The EDS model exhibits new phenomenology in both the early and late universe, the latter due to an EDE-mediated dark matter self-interaction. This dark matter-philic "fifth force", while constrained to be small, remains active in the late universe and is not screened in virialized halos. We find that the new interaction with dark matter partially resolves the LSS tension. However, the marginalized posteriors are nonethelessmore »
- Authors:
-
[1];
[2];
[3];
[4]
- Univ. of Chicago, IL (United States); Univ. of Winnipeg, Manitoba (Canada)
- Univ. of Chicago, IL (United States)
- Columbia Univ., New York, NY (United States); Flatiron Institute, New York, NY (United States)
- Columbia Univ., New York, NY (United States)
- Publication Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1902951
- Grant/Contract Number:
- SC0009924; AST-2108536
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D.
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 4; 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; Large scale structure of the Universe; Particle dark matter
Citation Formats
McDonough, Evan, Lin, Meng-Xiang, Hill, J. Colin, Hu, Wayne, and Zhou, Shengjia. Early dark sector, the Hubble tension, and the swampland. United States: N. p., 2022.
Web. doi:10.1103/physrevd.106.043525.
McDonough, Evan, Lin, Meng-Xiang, Hill, J. Colin, Hu, Wayne, & Zhou, Shengjia. Early dark sector, the Hubble tension, and the swampland. United States. https://doi.org/10.1103/physrevd.106.043525
McDonough, Evan, Lin, Meng-Xiang, Hill, J. Colin, Hu, Wayne, and Zhou, Shengjia. Wed .
"Early dark sector, the Hubble tension, and the swampland". United States. https://doi.org/10.1103/physrevd.106.043525. https://www.osti.gov/servlets/purl/1902951.
@article{osti_1902951,
title = {Early dark sector, the Hubble tension, and the swampland},
author = {McDonough, Evan and Lin, Meng-Xiang and Hill, J. Colin and Hu, Wayne and Zhou, Shengjia},
abstractNote = {We consider the interplay of the Early Dark Energy (EDE) model, the Swampland Distance Conjecture (SDC), and cosmological parameter tensions. EDE is a proposed resolution of the Hubble tension relying upon a near-Planckian scalar field excursion, while the SDC predicts an exponential sensitivity of masses of other fields to such an excursion, m ∝ e–c|ΔΦ|/Mpl with c ~ 0(1). Meanwhile, EDE is in tension with large-scale structure (LSS) data, due to shifts in the standard ΛCDM parameters necessary to fit the cosmic microwave background (CMB). One might hope that a proper treatment of the model, e.g., accounting for the SDC, may ameliorate the tension with LSS. Motivated by these considerations, we introduce the Early Dark Sector (EDS) model, wherein the mass of dark matter is exponentially sensitive to super-Planckian field excursions of the EDE scalar. The EDS model exhibits new phenomenology in both the early and late universe, the latter due to an EDE-mediated dark matter self-interaction. This dark matter-philic "fifth force", while constrained to be small, remains active in the late universe and is not screened in virialized halos. We find that the new interaction with dark matter partially resolves the LSS tension. However, the marginalized posteriors are nonetheless consistent with fEDE = 0 at 95% CL once the Dark Energy Survey Year 3 measurement of S8 is included. We study constraints on the model from Atacama Cosmology Telescope data, and find a factor of two improvement on the error bar on the SDC parameter c, along with an increased preference for the EDE component. Here, we discuss the implications of these constraints for the SDC, and find the tightest observational constraints to date on a swampland parameter, suggesting that an EDE description of cosmological data is in tension with the SDC.},
doi = {10.1103/physrevd.106.043525},
journal = {Physical Review. D.},
number = 4,
volume = 106,
place = {United States},
year = {Wed Aug 17 00:00:00 EDT 2022},
month = {Wed Aug 17 00:00:00 EDT 2022}
}
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