Primordial Black Hole Explosions Created All Matter
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- Researchers at Vrije Universiteit Brussel and MIT, in a pre-print on arXiv, theorize that low-mass primordial black holes (PBHs) exploded with enough force to reshape the early universe's quark-gluon plasma and produce all the matter we see today.
- Primordial black holes weighing under 500 trillion grams would have fully evaporated by now via Hawking radiation, and the new paper finds their deaths were far more violent than a steady energy leak — they produced relativistic fireballs and shock waves.
- The evaporation process unfolds in four phases: a slow plasma bubble, an ultra-relativistic blast modeled by the Blandford-McKee regime, a decelerating shock wave following the Sedov-Taylor framework, and final energy dissipation into surrounding plasma.
- The shock waves could have temporarily pushed pockets of plasma back above the 162 GeV electroweak symmetry threshold, creating the out-of-equilibrium conditions required for baryogenesis — the mechanism that made matter win out over antimatter.
- The research team is developing the baryogenesis implications in a companion paper, while the main study was authored by Miguel Vanvlasselaer et al. and posted to arXiv in 2026.
Why it matters: Baryogenesis is one of the biggest unsolved problems in physics — the standard Big Bang model predicts equal matter and antimatter, which should have annihilated entirely. This paper offers a testable mechanism tied to primordial black hole physics rather than speculative new particles, potentially giving cosmologists a new observational target to constrain PBH populations in the early universe.
