Dynamical Dark Matter from strongly-coupled dark sectors
Abstract
Dynamical Dark Matter (DDM) is an alternative framework for dark-matter physics in which the dark sector comprises a vast ensemble of particle species whose Standard-Model decay widths are balanced against their cosmological abundances. Previous studies of this framework have focused on a particular class of DDM ensembles—motivated primarily by Kaluza-Klein towers in theories with extra dimensions—in which the density of dark states scales roughly as a polynomial of the mass. In this paper, by contrast, we study the properties of a different class of DDM ensembles in which the density of dark states grows exponentially with mass. Ensembles with this Hagedorn-like property arise naturally as the “hadronic” resonances associated with the confining phase of a strongly coupled dark sector; they also arise naturally as the gauge-neutral bulk states of Type I string theories. We study the dynamical properties of such ensembles and demonstrate that an appropriate DDM-like balancing between decay widths and abundances can emerge naturally—even with an exponentially rising density of states. We also study the effective equations of state for such ensembles and investigate some of the model-independent observational constraints on such ensembles that follow directly from these equations of state. In general, we find that such constraintsmore »
- Authors:
-
- University of Arizona, Tucson, AZ (United States); University of Maryland, College Park, MD (United States)
- University of Arizona, Tucson, AZ (United States)
- Lafayette College, Easton, PA (United States)
- Publication Date:
- Research Org.:
- Univ. of Arizona, Tucson, AZ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1536229
- Alternate Identifier(s):
- OSTI ID: 1344608
- Grant/Contract Number:
- SC0009913; FG02-13ER41976; FG02-13ER41976/DE-SC0009913
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D.
- Additional Journal Information:
- Journal Volume: 95; 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; Astronomy & Astrophysics; Physics
Citation Formats
Dienes, Keith R., Huang, Fei, Su, Shufang, and Thomas, Brooks. Dynamical Dark Matter from strongly-coupled dark sectors. United States: N. p., 2017.
Web. doi:10.1103/physrevd.95.043526.
Dienes, Keith R., Huang, Fei, Su, Shufang, & Thomas, Brooks. Dynamical Dark Matter from strongly-coupled dark sectors. United States. https://doi.org/10.1103/physrevd.95.043526
Dienes, Keith R., Huang, Fei, Su, Shufang, and Thomas, Brooks. Wed .
"Dynamical Dark Matter from strongly-coupled dark sectors". United States. https://doi.org/10.1103/physrevd.95.043526. https://www.osti.gov/servlets/purl/1536229.
@article{osti_1536229,
title = {Dynamical Dark Matter from strongly-coupled dark sectors},
author = {Dienes, Keith R. and Huang, Fei and Su, Shufang and Thomas, Brooks},
abstractNote = {Dynamical Dark Matter (DDM) is an alternative framework for dark-matter physics in which the dark sector comprises a vast ensemble of particle species whose Standard-Model decay widths are balanced against their cosmological abundances. Previous studies of this framework have focused on a particular class of DDM ensembles—motivated primarily by Kaluza-Klein towers in theories with extra dimensions—in which the density of dark states scales roughly as a polynomial of the mass. In this paper, by contrast, we study the properties of a different class of DDM ensembles in which the density of dark states grows exponentially with mass. Ensembles with this Hagedorn-like property arise naturally as the “hadronic” resonances associated with the confining phase of a strongly coupled dark sector; they also arise naturally as the gauge-neutral bulk states of Type I string theories. We study the dynamical properties of such ensembles and demonstrate that an appropriate DDM-like balancing between decay widths and abundances can emerge naturally—even with an exponentially rising density of states. We also study the effective equations of state for such ensembles and investigate some of the model-independent observational constraints on such ensembles that follow directly from these equations of state. In general, we find that such constraints tend to introduce correlations between various properties of these DDM ensembles such as their associated mass scales, lifetimes, and abundance distributions. For example, we find that these constraints allow DDM ensembles with energy scales ranging from the GeV scale all the way to the Planck scale, but that the total present-day cosmological abundance of the dark sector must be spread across an increasing number of different states in the ensemble as these energy scales are dialed from the Planck scale down to the GeV scale. Furthermore, numerous other correlations and constraints are also discussed.},
doi = {10.1103/physrevd.95.043526},
journal = {Physical Review. D.},
number = 4,
volume = 95,
place = {United States},
year = {Wed Feb 22 00:00:00 EST 2017},
month = {Wed Feb 22 00:00:00 EST 2017}
}
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Works referencing / citing this record:
Multi-Component Dark Matter: the vector and fermion case
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