Loop quantum gravity- is the critical density sufficient to form a 'black hole'?
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The universe is described by the FLRW metric. This has a singularity at t=0t=0 (and for closed universes also at the recollapse time) however it has no horizons. A black hole is described by the Schwarzschild metric. This has a singularity at r=0r=0 and a horizon at r=2GM/c2r=2GM/c2.
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A black hole is a region of spacetime exhibiting such strong gravitational effects that ... Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle
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