Star collapse to form directly a black hole

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Discussion Overview

The discussion centers on whether a star can collapse directly into a black hole without undergoing a supernova, or if a supernova is a necessary precursor that leads to the formation of neutron stars, which may then collapse into black holes under certain conditions.

Discussion Character

  • Debate/contested
  • Exploratory

Main Points Raised

  • One participant questions whether a star can collapse directly into a black hole or if a supernova is required, suggesting that neutron stars may form first before collapsing into black holes.
  • Another participant expresses uncertainty, noting that it seems unlikely for a sufficiently massive body to avoid an explosive stage like a supernova, while acknowledging that not all collapsed objects necessarily originate from supernovae.
  • It is proposed that black holes could potentially form through the gradual accumulation of matter from nearby stars, although this scenario would still likely involve a significant energy release during the final collapse.
  • A claim is made that very massive stars might bypass the supernova phase entirely and collapse directly into black holes, referencing external literature to support this view.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of supernovae in the formation of black holes, indicating that multiple competing perspectives exist without a clear consensus.

Contextual Notes

The discussion reflects various assumptions about the processes involved in stellar collapse and the definitions of terms like "supernova" and "black hole," which may influence the interpretations of the phenomena being discussed.

shounakbhatta
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Hello,

Does a star collapse directly to form a black hole without creating a supernova or whether a supernova forms some neutron stars which after crossing the TOV limit forms a black hole?

Thanks.
 
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Nobody knows.
It seems unlikely that a body massive enough to form a black hole will not also pass through an explosive stage, maybe a supernova, by much the same mechanism as the formation of neutron stars. We know that supernovae leave behind very collapsed objects but we do not know that all collapsed objects form from supernovae.

For instance, it may be possible for a black hole to form by cannibalism of close stars by a big one. In that case, matter gets added gradually. But you'd still think the big final collapse would release a lot of energy in one go.

There's also supermassive and primordial black holes ... the area is quite open.
 
Oh cool! Reading material <reads> thanks...
 

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