Connecting the Extremes: A Story of Supermassive Black Holes and Ultralight Dark Matter

Abstract

The formation of ultra rare supermassive black holes (SMBHs), with masses of $\mathcal{O}(10^9{M}_{\odot })$, in the first billion years of the Universe remains an open question in astrophysics. At the same time, ultralight dark matter (DM) with mass in the vicinity of $\mathcal{O}(10^{-20}\text{eV})$ has been motivated by small scale DM distributions. Though this type of DM is constrained by various astrophysical considerations, certain observations could be pointing to modest evidence for it. We present a model with a confining first order phase transition at $\sim 10$ keV temperatures, facilitating production of $\mathcal{O}(10^9{M}_{\odot })$ primordial SMBHs. Such a phase transition can also naturally lead to the implied mass for a motivated ultralight axion DM candidate, suggesting that SMBHs and ultralight DM may be two sides of the same cosmic coin. We consider constraints and avenues to discovery from superradiance and a modification to $N_{\mathrm{eff}}$. On general grounds, we also expect primordial gravitational waves -- from the assumed first order phase transition -- characterized by frequencies of $\mathcal{O}(10^{-12}-10^{-9}\text{Hz})$. This frequency regime is largely uncharted, but could be accessible to pulsar timing arrays if the primordial gravitational waves are at the higher end of this frequency range, as could be the case in our assumed confining phase transition.

8 pages, 2 figures, comments welcome; v2: matches published version

References in corpus (26)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• Ultralight scalars as cosmological dark matter
• Primordial Black Holes as Dark Matter: Recent Developments
• The NANOGrav 12.5-year Data Set: Search For An Isotropic Stochastic Gravitational-Wave Background
• Gravitational-wave sensitivity curves
• The Assembly of the First Massive Black Holes
• A Luminous Quasar at Redshift 7.642
• Gravitational Waves from Phase Transitions at the Electroweak Scale and Beyond
• Effect of Primordial Black Holes on the Cosmic Microwave Background and Cosmological Parameter Estimates
• Relic neutrino decoupling with flavour oscillations revisited
• Gravitational wave generation from bubble collisions in first-order phase transitions: an analytic approach
• Strong bound on canonical ultra-light axion dark matter from the Lyman-alpha forest
• Gravitational wave energy budget in strongly supercooled phase transitions
• Ultra Light Boson Dark Matter and Event Horizon Telescope Observations of M87*
• A dark matter profile to model diverse feedback-induced core sizes of $\Lambda$CDM haloes
• Curvature profiles as initial conditions for primordial black hole formation
• The glueball spectrum of SU(3) gauge theory in 3+1 dimension
• Gravitational wave signatures of ultralight vector bosons from black hole superradiance
• Diversity of dark matter density profiles in the Galactic dwarf spheroidal satellites
• Seeding Supermassive Black Holes with Self-Interacting Dark Matter: A Unified Scenario with Baryons
• Soliton Random Walk and the Cluster-Stripping Problem in Ultralight Dark Matter
• Narrowing the mass range of Fuzzy Dark Matter with Ultra-faint Dwarfs
• Primordial Black Holes from Confinement
• Core-Halo Mass Relation in Scalar Field Dark Matter Models and its Consequences for the Formation of Supermassive Black Holes
• Ultralight bosons for strong gravity applications from simple Standard Model extensions
• Higher topological charge in the QCD vacuum and axion cosmology

Cited by in corpus (15)

• Primordial black holes from an electroweak phase transition
• PBH formation from overdensities in delayed vacuum transitions
• Catastrogenesis: DM, GWs, and PBHs from ALP string-wall networks
• Superradiant Production of Heavy Dark Matter from Primordial Black Holes
• Old Phase Remnants in First Order Phase Transitions
• Sensitivity to Dark Sector Scales from Gravitational Wave Signatures
• Probing Axions via Light Circular Polarization and Event Horizon Telescope
• Dark matter effect on black hole accretion disks
• Near-horizon microstructure and superradiant instability of black holes
• On the Interaction between Ultralight Bosons and Quantum-Corrected Black Holes
• Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies
• Impact of primordial black holes on the formation of the first stars and galaxies
• Hot primordial regions with anomalous hydrogenless chemical composition
• Black Hole Cold Brew: Fermi Degeneracy Pressure
• Cosmic Overture Echoed in a Stellar Final Act: Implications of Nanohertz Gravitational Waves for Core Collapse Supernova Neutrinos