Primordial Black Hole Formation via Inverted Bubble Collapse

Abstract

We propose a novel mechanism of primordial black hole (PBH) formation through inverted bubble collapse. In this scenario, bubbles nucleate sparsely in an incomplete first-order phase transition, such that they remain isolated and do not percolate or collide with each other due to the extremely low nucleation rate. This is followed by a bulk phase transition in the rest of the universe that inverts these pre-existing bubbles into false vacuum regions. These spherically symmetric false-vacuum bubbles subsequently collapse to form PBHs. Unlike conventional PBH formation mechanisms associated with domain wall collapse or bubble coalescence, our inverted bubble collapse mechanism naturally ensures spherical collapse. We demonstrate that, when applied to the singlet extension of the Standard Model, this mechanism can produce highly monochromatic PBHs with masses up to $\mathcal{O}(10^{-7}\text{-}10^{-5})M_{\odot }$, which potentially explain the microlensing events observed in the OGLE and Subaru HSC data.

14 pages, 5 figures, v3: version published in JHEP

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Cited by in corpus (8)

• Bubble wall dynamics from nonequilibrium quantum field theory
• Curvature Perturbations from First-Order Phase Transitions: Implications to Black Holes and Gravitational Waves
• Electroweak Phase Transition, Gravitational Waves and Collider Probes in Multi-Scalar Dark Matter Scenarios
• Probing low scale leptogenesis through gravitational wave
• Revisiting Singlet Fermion Dark Matter with a Scalar Portal: Connecting Higgs Phenomenology and Strong Electroweak Phase Transition
• Numerical simulations of primordial black hole formation via delayed first-order phase transitions
• Primordial Black Hole Formation and Multimessenger Signals in a Complex Singlet Extension of the Standard Model
• The Dark Side of the Moon: Listening to Scalar-Induced Gravitational Waves