Abstract
Scalar field instability can lead to a short matter dominated era, during which the matter is represented by large lumps of the scalar field, whose distribution exhibits large fluctuations, leading to copious production of primordial black holes (PBH). The PBH abundance can be sufficient to explain up to 100% of dark matter without violating observational constraints. Small PBH can destabilize neutron stars and contribute to r-process nucleosynthesis.
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