Were you born in an aborted primordial black hole?
arxiv(2024)
摘要
We propose a novel mechanism of electroweak baryogenesis based on the
standard model only and explaining the coincidence between the baryon and dark
matter densities in the Universe, as well as the observed value of the
baryon-to-photon ratio. In our scenario, large curvature fluctuations slightly
below the threshold for Primordial Black Hole (PBH) formation locally reheat
the plasma above the sphaleron barrier when they collapse gravitationally but
without forming a black hole. This rapid process can lead to a maximal
baryogenesis in those regions at the Quantum Chromodynamics (QCD) epoch at
thermal temperatures between 20 MeV and 50 MeV. Compared to another mechanism
relying on shock waves associated to the formation of PBHs, our mechanism
instead applies to aborted PBHs. Using simulations in numerical relativity, we
calculate the overdensity threshold for baryogenesis and show that the
baryon-to-photon ratio is generically between two and three times larger than
the relative abundance of PBHs formed at those temperatures. Finally, we show
that PBH formation models at the QCD epoch leading to an abundance comparable
to the dark matter could have generated a baryon density and an averaged
baryon-to-photon ratio consistent with observations.
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