Antineutrinos After Big Bang: Where Are They?

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Discussion Overview

The discussion revolves around the fate of antineutrinos produced shortly after the Big Bang, exploring their relationship with neutrinos and the broader implications for matter-antimatter asymmetry in the universe. The scope includes theoretical considerations and cosmological questions.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant notes that a gas of elementary particles, including neutrinos and antineutrinos, was produced after the Big Bang and questions what happened to the antineutrinos.
  • Another participant highlights the broader cosmological question regarding the apparent excess of matter over antimatter, suggesting that this is a significant unresolved issue.
  • A different participant proposes that symmetry breaking may be a contributing factor to the matter-antimatter imbalance.
  • There is a reiteration that neutrinos and antineutrinos were likely produced in nearly equal amounts, implying that discussions about neutrinos often encompass antineutrinos as well.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the fate of antineutrinos and the matter-antimatter asymmetry, indicating that multiple competing views and hypotheses exist without a consensus.

Contextual Notes

Limitations include the lack of definitive answers regarding the fate of antineutrinos and the mechanisms behind the matter-antimatter imbalance, as well as the dependence on theoretical frameworks that may not be universally accepted.

tut_einstein
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Right after the big bang a gas consisting of many elementary particles, including neutrinos and antineutrinos was produced. I know that the neutrinos decoupled and are believed to form a universal gas presently at about 2K. What happened to the anti-neutrinos?

Thanks
 
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Actually one of the major questions in cosmology is what happened to all the antimatter of ALL types that should have been produced after the big bang. Why is there more matter than antimatter? I'm not sure if we have a good answer yet.
 
The current hypothesis is symetry breaking is the 'bad guy'.
 
tut_einstein said:
Right after the big bang a gas consisting of many elementary particles, including neutrinos and antineutrinos was produced. I know that the neutrinos decoupled and are believed to form a universal gas presently at about 2K. What happened to the anti-neutrinos?

Thanks
When people say neutrinos, you can expect they mean anti-neutrinos as well. The neutrinos and anti-neutrinos would have been produced in nearly equal amounts.
 

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