Physical aspects of a naked singularity explosion: how does a naked singularity explode?

The behaviour of the quantum stress tensor for the scalar field on the classical background of a spherical dust collapse is studied. In previous works a diverging flux of quantum radiation was predicted. We use the exact expressions in a two-dimensional model formulated by Barve et al (1998 Phys. Rev. D 58 104018). Our present results show that the backreaction does not become important during the semiclassical phase. The appearance of the naked singularity would not be affected by this quantum field radiation. To predict whether or not explosion of the naked singularity occurs, we need a theory of quantum gravity. We depict the generation of a diverging flux inside the collapsing star. The quantum energy is gathered around the centre positively. This would be converted into a diverging flux along the Cauchy horizon. The ingoing negative flux crosses the Cauchy horizon. The intensity of it is divergent only at the central naked singularity. This diverging negative ingoing flux is balanced with the outgoing positive diverging flux which propagates along the Cauchy horizon. After replacement of the naked singularity by a practical high-density region, the instantaneous diverging radiation would change to a milder one with finite duration.