A quartic scalar field collapses with nearly the same critical exponent as a radiation fluid during primordial black hole formation, supporting the near universality of type II critical collapse.
Dynamics of pri- mordial black hole formation,
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Primordial Black Hole Formation in a Scalar Field Dominated Universe: Investigation of the Critical nature of the Collapse
A quartic scalar field collapses with nearly the same critical exponent as a radiation fluid during primordial black hole formation, supporting the near universality of type II critical collapse.