A new theoretical study is challenging one of the most widely accepted ideas in black hole physics, that black holes must contain either a singularity or a Cauchy horizon at their core.
Conducted by Francesco Di Filippo from the Institute for Theoretical Physics in Frankfurt, the research suggests that a combination of electric charge and Hawking radiation could prevent the formation of both singularities and Cauchy horizons under certain conditions.
Black holes are regions where gravity is so intense that nothing, including light, can escape. According to current theories, their interiors are expected to contain either a singularity, where density and spacetime curvature become infinite, or a Cauchy horizon, a boundary beyond which the future cannot be predicted using known laws of physics.
Using Penrose diagrams, a mathematical tool that maps the structure of spacetime, Di Filippo examined charged black holes formed through gravitational collapse. His analysis found that the combined effects of electromagnetic repulsion and Hawking radiation may be strong enough to prevent the breakdown of spacetime predicted by traditional singularity theorems.
“Yet this effect is usually considered too small to avoid the conclusion of the singularity theorem,” said Di Filippo. “In the paper I note that combining this effect with the electromagnetic repulsion present in a charged black hole can be strong enough to prevent both a singularity and a Cauchy horizon from ever forming.”
The findings suggest that solving some of the long-standing mysteries surrounding black hole interiors may not necessarily require a complete theory of quantum gravity. Instead, established theories that combine classical spacetime with quantum matter effects could offer new insights.
Di Filippo emphasized that the work remains theoretical and requires further investigation. He is now exploring whether a similar mechanism could apply to rotating black holes, where angular momentum may provide a repulsive effect comparable to electric charge.
The study opens a new avenue for research into how Hawking radiation influences the internal structure of black holes and whether spacetime breakdown can be avoided under specific conditions.
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