Can QCD Axion Stars explain Subaru HSC microlensing?
arXiv:2109.13153 · doi:10.1103/PhysRevD.104.103020
Abstract
A non-negligible fraction of the QCD axion dark matter may form gravitationally bound Bose Einstein condensates, which are commonly known as axion stars or axion clumps. Such astrophysical objects have been recently proposed as the cause for the single candidate event reported by Subaru Hyper Suprime-Cam (HSC) microlensing search in the Andromeda galaxy. Depending on the breaking scale of the Peccei-Quinn symmetry and the details of the dark matter scenario, QCD axion clumps may form via gravitational condensation during radiation domination, in the dense core of axion miniclusters, or within axion minihalos around primordial black holes. We analyze all these scenarios and conclude that the microlensing candidate detected by the Subaru HSC survey is likely not caused by QCD axion stars.
7 pages, 2 figures. V2: Updated towards version published in Physical Review D
References in corpus (21)
- Primordial Black Holes as Dark Matter
- Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds
- Flux Compactification
- Discovering the QCD Axion with Black Holes and Gravitational Waves
- Understanding the Core-Halo Relation of Quantum Wave Dark Matter, DM, from 3D Simulations
- Effect of Primordial Black Holes on the Cosmic Microwave Background and Cosmological Parameter Estimates
- Dilute and dense axion stars
- Relativistic axions from collapsing Bose stars
- Improved estimation of radiated axions from cosmological axionic strings
- Astrophysical Effects of Scalar Dark Matter Miniclusters
- NANOGrav results and LIGO-Virgo primordial black holes in axion-like curvaton model
- Dark Matter Density Spikes around Primordial Black Holes
- Instability of rotating Bose stars
- Merger of Dark Matter Axion Clumps and Resonant Photon Emission
- Radio signatures from encounters between Neutron Stars and QCD-Axion Minihalos around Primordial Black Holes
- Dipole Radiation and Beyond from Axion Stars in Electromagnetic Fields
- Probing Relativistic Axions from Transient Astrophysical Sources
- Microlensing constraints on axion stars including finite lens and source size effects
- Shining Primordial Black Holes
- Can Primordial Black Holes as all Dark Matter explain Fast Radio Bursts?
- Diluted Axion Star Collisions with Neutron Stars