Concentrated dark matter: Enhanced small-scale structure from codecaying dark matter

Jeff A. Dror, Eric Kuflik, Brandon Melcher, Scott Watson

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


We study the cosmological consequences of codecaying dark matter - a recently proposed mechanism for depleting the density of dark matter through the decay of nearly degenerate particles. A generic prediction of this framework is an early dark matter dominated phase in the history of the Universe, that results in the enhanced growth of dark matter perturbations on small scales. We compute the duration of the early matter dominated phase and show that the perturbations are robust against washout from free streaming. The enhanced small-scale structure is expected to survive today in the form of compact microhalos and can lead to significant boost factors for indirect-detection experiments, such as FERMI, where dark matter would appear as point sources.

Original languageAmerican English
Article number063524
JournalPhysical Review D
Issue number6
StatePublished - 15 Mar 2018

Bibliographical note

Publisher Copyright:
© 2018 authors. Published by the American Physical Society.


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