Can Two Neutrinos Form a Black Hole?

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Discussion Overview

The discussion explores whether two neutrinos can come together to form a black hole, considering their properties such as mass and lack of electric or color charge. The scope includes theoretical implications and the nature of gravitational interactions between neutrinos.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions if two neutrinos could collapse into a black hole due to their mass, despite their weak gravitational interaction.
  • Another participant calculates the Schwarzschild radius for two neutrinos, concluding it is smaller than a Planck length, suggesting that forming a black hole is not feasible.
  • A third participant expresses curiosity about the significance of the Planck length in this context.
  • A later reply indicates that while two neutrinos may not form a black hole, a larger number of neutrinos could potentially do so, and clarifies the role of the Planck length in current theories of quantum gravity.

Areas of Agreement / Disagreement

Participants do not reach a consensus; there are competing views on the possibility of two neutrinos forming a black hole, with some asserting it is impossible while others suggest that a larger collection could achieve this.

Contextual Notes

The discussion includes assumptions about gravitational interactions and the implications of the Planck length, which remains a topic of theoretical exploration without a definitive framework for quantum gravity.

Jonnyb42
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Hm, I wonder since neutrino's have no electric charge or color charge, but do have mass, is it possible for two neutrinos to come so close together that they collapse on themselves? Although the gravitational field between just two neutrinos is extremely small, it should still be possible right if they have no other interaction with each other?

Of course, the idea could be expanded to LOTS of neutrinos, but I am curious of just two.
What would happen??

Thanks
 
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No. I calculated the schwarzchild radius of two of the largest neutrino mass estimations I could find to be significantly smaller than a Planck length.
 
Wow, how interesting! So the Planck length is really considered to be the smallest length?
 
Indeed, if you had a bunch of neutrinos you could form a black hole.

As for the Planck length, it's not really the smallest length. It's the approximate length scale at which we think Quantum Gravity will become important. So I guess you could say it's the smallest length scale we can reasonably probe with our current theories, since we have no good theory of QG right now.
 

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