Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.161103
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Funding
- DOE [de-sc0019225]
- Leinweber Graduate Fellowship
- Advanced Research Computing at the University of Michigan in Ann Arbor
- U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
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Ultracompact dark matter (DM) minihalos at masses at and below 10(-12) M-circle dot arise in axion DM models where the Peccei-Quinn (PQ) symmetry is broken after inflation. The minihalos arise from density perturbations that are generated from the nontrivial axion self-interactions during and shortly after the collapse of the axion-string and domain-wall network. We perform high-resolution simulations of this scenario starting at the epoch before the PQ phase transition and ending at matter-radiation equality. We characterize the spectrum of primordial perturbations that are generated and comment on implications for efforts to detect axion DM. We also measure the DM density at different simulated masses and argue that the correct DM density is obtained for m(a) = 25.2 +/- 11.0 mu eV.
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