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Imprints of decaying dark matter on cosmic voids


Lester, E and Bolejko, K, Imprints of decaying dark matter on cosmic voids, Physical Review D, 104 Article 123540. ISSN 2470-0010 (2021) [Refereed Article]

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Copyright Statement

2021 American Physical Society

DOI: doi:10.1103/PhysRevD.104.123540


The standard cosmological model assumes that more than 85% of matter is in the form of collisionless and pressureless dark matter. Unstable decaying dark matter has been proposed in the literature as an extension to the standard cold dark matter model. In this paper, we investigate a scenario when dark matter decays, and the resultant particle moves with respect to the dark matter. A covariant hydrodynamical model is developed in which the decay is modeled by the transfer of energy-momentum between two dark dust fluid components. We parametrize the model in terms of the decay rate Γ and injection velocity vi of the resultant dark matter particles. We apply the framework to study the evolution of cosmic voids which are environments with low content of baryonic matter. Thus, unlike baryon-rich environments, voids provide an opportunity to measure dark matter signals that are less contaminated by complex baryonic processes. We find that the growth of S-type voids is modified by the dark matter decay, leading to imprints at the present day. This paper serves as a proof of concept that cosmic voids can be used to study dark mater physics. We argue that future cosmological observations of voids should focus on signs of reported features to either confirm or rule out the decaying dark matter scenario. Lack of presence of reported features could put constraints of the decay of dark matter in terms of Γ>H-10 and 𝑣i<10  km/s.

Item Details

Item Type:Refereed Article
Keywords:gravitation, cosmology, astrophysics, large scale structure of the universe, particle dark matter
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Bolejko, K (Dr Krzysztof Bolejko)
ID Code:148327
Year Published:2021
Funding Support:Australian Research Council (FT140101270)
Deposited By:Physics
Deposited On:2021-12-22
Last Modified:2022-02-24
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