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Title: Partially acoustic dark matter, interacting dark radiation, and large scale structure

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [1];  [3];  [1]
  1. Univ. of Maryland, College Park, MD (United States). Dept. of Physics. Maryland Center for Fundamental Physics
  2. Univ. of Maryland, College Park, MD (United States). Dept. of Physics. Maryland Center for Fundamental Physics; Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy; Perimeter Inst., North Waterloo, ON (Canada)
  3. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics

The standard paradigm of collisionless cold dark matter is in tension with measurements on large scales. In particular, the best fit values of the Hubble rate H0 and the matter density perturbation σ8 inferred from the cosmic microwave background seem inconsistent with the results from direct measurements. We show that both problems can be solved in a framework in which dark matter consists of two distinct components, a dominant component and a subdominant component. The primary component is cold and collisionless. The secondary component is also cold, but interacts strongly with dark radiation, which itself forms a tightly coupled fluid. The growth of density perturbations in the subdominant component is inhibited by dark acoustic oscillations due to its coupling to the dark radiation, solving the σ8 problem, while the presence of tightly coupled dark radiation ameliorates the H0 problem. The subdominant component of dark matter and dark radiation continue to remain in thermal equilibrium until late times, inhibiting the formation of a dark disk. We present an example of a simple model that naturally realizes this scenario in which both constituents of dark matter are thermal WIMPs. Our scenario can be tested by future stage-IV experiments designed to probe the CMB and large scale structure.

Research Organization:
Florida State Univ., Tallahassee, FL (United States); Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
Contributing Organization:
Univ. of California, Riverside, CA (United States); Perimeter Inst., North Waterloo, ON (Canada)
Grant/Contract Number:
SC0010102; PHY-1315155; PHY-1066293
OSTI ID:
1368037
Journal Information:
Journal of High Energy Physics (Online), Vol. 2016, Issue 12; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 60 works
Citation information provided by
Web of Science

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Cited By (25)

Make dark matter charged again journal May 2017
Cosmological constraints on interacting light particles journal August 2017
Dark catalysis journal August 2017
Wandering in the Lyman-alpha forest: a study of dark matter-dark radiation interactions journal September 2017
Interacting dark sector and precision cosmology journal January 2018
On structure formation from a small-scales-interacting dark sector journal April 2019
Insensitivity of the distance ladder Hubble constant determination to Cepheid calibration modelling choices journal March 2018
ETHOS – an Effective Theory of Structure Formation: detecting dark matter interactions through the Lyman-α forest journal May 2019
Visualizing invisible dark matter annihilation with the CMB and matter power spectrum journal July 2019
The Weak Gravity Conjecture and emergence from an ultraviolet cutoff journal April 2018
Revisiting a Negative Cosmological Constant from Low-Redshift Data journal August 2019
The Effect of Dark Matter–Dark Radiation Interactions on Halo Abundance: A Press–Schechter Approach journal March 2019
Make Dark Matter Charged Again text January 2016
Dark Catalysis text January 2017
Cosmological Constraints on Interacting Light Particles text January 2017
Wandering in the Lyman-alpha Forest: A Study of Dark Matter-Dark Radiation Interactions text January 2017
Inflationary Features and Shifts in Cosmological Parameters from Planck 2015 Data text January 2017
Insensitivity of The Distance Ladder Hubble Constant Determination to Cepheid Calibration Modeling Choices text January 2017
Partially Acoustic Dark Matter Cosmology and Cosmological Constraints text January 2017
Light Dark Matter: Models and Constraints text January 2017
Cosmological Signatures of a Mirror Twin Higgs preprint January 2018
Gravitational Lensing and the Power Spectrum of Dark Matter Substructure: Insights from the ETHOS N-body Simulations text January 2018
The effect of dark matter-dark radiation interactions on halo abundance -- a Press-Schechter approach text January 2018
Revisiting a negative cosmological constant from low-redshift data text January 2019
Non-minimal dark sector physics and cosmological tensions text January 2019

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