Overview
A theoretical study proposes an alternative outcome to the collapse of a massive star, specifically that it might not result in the formation of a black hole with a singularity and an event horizon. Instead, this research suggests the collapse could trigger the creation of a new, miniature universe contained within the dying star itself. This hypothesized miniature cosmos would subsequently expand, propelled by dark energy, thus countering gravitational collapse and leading to the formation of an exotic object termed a gravastar.
Research Context
The conventional understanding of massive star collapse involves the formation of a black hole, characterized by a singularity — a point of infinite density — shielded by an event horizon, beyond which nothing, not even light, can escape. The current theoretical exploration directly questions this standard outcome by introducing an alternative physical mechanism for the post-collapse state of a massive star.
Findings
The central finding of this theoretical study is the proposition that during the collapse of a massive star, a singularity and an event horizon may not necessarily form. Instead, the process could instigate the birth of a minute new universe internally. This new universe, described as a 'miniature cosmos,' would be powered by dark energy. The expansion driven by this dark energy would counteract the star's self-gravity, effectively preventing a complete gravitational collapse into a singularity. The study suggests that this dynamic interaction — dark energy-driven expansion opposing gravitational forces — would result in the formation of a 'gravastar.' A gravastar is posited as an exotic object distinct from a conventional black hole, characterized by its internal structure and the absence of a singularity or an event horizon.