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Primordial black-hole formation and heavy r-process element synthesis from the cosmological QCD transition. Two aspects of an inhomogeneous early Universe
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abstract
We review the role of primordial black holes (PBHs) for illuminating the dark ages of the cosmological evolution and as dark matter candidates. We elucidate the role of phase transitions for primordial black hole formation in the early Universe and focus our attention to the cosmological QCD phase transition within a recent microscopical model. We explore the impact of physics beyond the Standard Model on the cosmic equation of state and the probability distribution for the formation of primordial black holes which serve as dark matter (DM) candidates. We argue that besides primordial black holes also droplet-like quark-gluon plasma inhomogeneities may become gravitationally stabilized for a sufficiently long epoch to distill baryon number and form nuclear matter droplets which upon their evaporation may enrich the cosmos locally with heavy $r$-process elements already in the early Universe.
Forward citations
Cited by 3 Pith papers
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Primordial Black Hole mass growth from neutrinos during the radiation era
PBHs of ~1e3–1e7 solar masses can significantly grow by absorbing neutrinos before matter-radiation equality.
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Primordial Black Hole mass growth from neutrinos during the radiation era
Neutrino absorption lets intermediate-mass and supermassive primordial black holes grow during the radiation era, shifting thermal-history peaks and raising f_PBH.
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Generalized Beth-Uhlenbeck approach to the thermodynamics of quark-hadron matter
Within a generalized Beth-Uhlenbeck cluster model, the paper concludes that chemical freeze-out of hadrons coincides with their Mott dissociation at the chiral crossover temperature.
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