For genuine 3D collapsing Bianchi I initial conditions in mLQC-I, quantum effects damp shear exponentially after the bounce, yielding an isotropic attractor independent of matter content under the weak energy condition.
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3+1 BSSN simulations find the critical overdensity threshold for PBH collapse in radiation era lies between 0.77 and 0.83.
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Genericness of quantum damping of cosmological shear in modified loop quantum cosmology
For genuine 3D collapsing Bianchi I initial conditions in mLQC-I, quantum effects damp shear exponentially after the bounce, yielding an isotropic attractor independent of matter content under the weak energy condition.