Probing axion dark matter with 21cm fluctuations from minihalos
arXiv:2007.02276 · doi:10.1103/PhysRevD.103.023521
Abstract
If the symmetry breaking inducing the axion occurs after the inflation, the large axion isocurvature perturbations can arise due to a different axion amplitude in each causally disconnected patch. This causes the enhancement of the small-scale density fluctuations which can significantly affect the evolution of structure formation. The epoch of the small halo formation becomes earlier and we estimate the abundance of those minihalos which can host the neutral hydrogen atoms to result in the 21cm fluctuation signals. We find that the future radio telescopes, such as the SKA, can put the axion mass bound of order eV for the simple temperature-independent axion mass model, and the bound can be extended to of order eV for a temperature-dependent axion mass.
15 pages, 10 figures
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Cited by in corpus (7)
- Cosmological Tension of Ultralight Axion Dark Matter and its Solutions
- Probing the primordial Universe with 21-cm line from cosmic dawn/epoch of reionization
- Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation
- Prospects for Observing High-redshift Radio-loud Quasars in the SKA Era: Paving the Way for 21-cm Forest Observations
- Anisotropies in Cosmological 21 cm Background by Oscillons/I-balls of Ultra-light Axion-like Particle
- Probing isocurvature perturbations with 21-cm global signal in the light of HERA result
- How light can ALP dark matter be?