Axion star condensation around primordial black holes and microlensing limits

Abstract

We present novel findings concerning the parameter space of axion stars, extended object forming in dense dark matter environments through gravitational condensation. We emphasize their formation within the dense minihalos that potentially surround primordial black holes and in axion miniclusters. Our study investigates the relation between the radius and mass of an axion star in these dense surroundings, revealing distinct morphological characteristics compared to isolated scenarios. We explore the implications of these results when applied to the bound state between a primordial black hole and an axion star and the gravitational microlensing from extended objects, leading to insights on the observational constraints from such ``halo'' axion stars. We provide a constraint on the fraction of the galactic population of axion stars from their contribution to the microlensing events from the EROS-2 survey, using the numerical resolution of the Schrödinger-Poisson equation.

25 pages, 7 figures. Part of COST actions CA21106 and CA21136

References in corpus (55)

• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Cosmic Structure as the Quantum Interference of a Coherent Dark Wave
• Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds
• The landscape of QCD axion models
• Discovering the QCD Axion with Black Holes and Gravitational Waves
• Understanding the Core-Halo Relation of Quantum Wave Dark Matter, $\psi$DM, from 3D Simulations
• Effect of Primordial Black Holes on the Cosmic Microwave Background and Cosmological Parameter Estimates
• The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters
• Cosmic microwave background bounds on primordial black holes including dark matter halo accretion
• More Axions from Strings
• Early-Universe Simulations of the Cosmological Axion
• Dilute and dense axion stars
• The dark-matter axion mass
• Relativistic axions from collapsing Bose stars
• An excess of small-scale gravitational lenses observed in galaxy clusters
• Detecting High-Frequency Gravitational Waves with Microwave Cavities
• Formation and mass growth of axion stars in axion miniclusters
• Isocurvature bounds on axions revisited
• Subaru through a different lens: microlensing by extended dark matter structures
• Gravitational Waves as a Big Bang Thermometer
• Astrophysical Effects of Scalar Dark Matter Miniclusters
• No massive black holes in the Milky Way halo
• First Simulations of Axion Minicluster Halos
• Fuzzy Dark Matter Soliton Cores around Supermassive Black Holes
• Black Holes and WIMPs: All or Nothing or Something Else
• Small-scale clumps of dark matter
• Gravitational microlensing by dark matter in extended structures
• Simulations of Axion Minihalos
• Axion minicluster power spectrum and mass function
• Axion astronomy with microwave cavity experiments
• Scaling relations of Fuzzy Dark Matter haloes I: individual systems in their cosmological environment
• Transient Radio Signatures from Neutron Star Encounters with QCD Axion Miniclusters
• Relaxation times for Bose-Einstein condensation in axion miniclusters
• Stellar Disruption of Axion Miniclusters in the Milky Way
• Spectrum of global string networks and the axion dark matter mass
• Structure of Axion Miniclusters
• Dynamical evolution of axion condensates under stimulated decays into photons
• Axion Star Nucleation in Dark Minihalos around Primordial Black Holes
• Electromagnetic Bursts from Mergers of Oscillons in Axion-like Fields
• Axion Star Explosions: A New Source for Axion Indirect Detection
• Recurrent Axinovae and their Cosmological Constraints
• Relaxation times for Bose-Einstein condensation by self-interaction and gravity
• Cavity Detection of Gravitational Waves: Where Do We Stand?
• Possible evidence of QCD axion stars in HSC and OGLE microlensing events
• Microlensing constraints on axion stars including finite lens and source size effects
• Kinetic relaxation and nucleation of Bose stars in self-interacting wave dark matter
• Analysis of Bose-Einstein condensation times for self-interacting scalar dark matter
• Gravitational microlensing by dressed primordial black holes
• Revealing Dark Matter Dress of Primordial Black Holes by Cosmological Lensing
• Searching for High Frequency Gravitational Waves with Phonons
• Axion minicluster streams in the solar neighbourhood
• Microlensing signatures of extended dark objects using machine learning
• Cosmic microwave background constraints on extended dark matter objects
• Statistical Uncertainties of the $N_{\text{DW}}=1$ QCD Axion Mass Window from Topological Defects
• Multimessenger signals from compact axion star mergers

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