Bouncing compact objects I: Quantum extension of the Oppenheimer-Snyder collapse

Understand

This article proposes a generalization of the Oppenheimer-Snyder model which describes a bouncing compact object.

• The corrections responsible for the bounce are parameterized in a general way so as to remain agnostic about the specific mechanism of singularity resolution at play.
• It thus develops an effective theory based on a thin shell approach, inferring generic properties of such a UV complete gravitational collapse.
• The main result comes in the form of a strong constraint applicable to general UV models : if the dynamics of the collapsing star exhibits a bounce, it always occurs below, or at most at the energy threshold of horizon formation, so that only an instantaneous trapping horizon may be formed while a trapped region never forms.