Where Did the Electrons Come From in Big Bang Nucleosynthesis?

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Discussion Overview

The discussion centers on the origins of electrons during Big Bang nucleosynthesis (BBN) and the processes involved in the formation of nucleons and electrons. Participants explore the concepts of baryogenesis and leptogenesis, as well as the timing of photon appearance in the context of the Big Bang Theory.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the origin of electrons during BBN, suggesting it may involve beta decay or another process.
  • Another participant asserts that nucleons did not form during BBN but were created earlier in a process called baryogenesis, while electrons are associated with leptogenesis.
  • A participant inquires about the time frame for the appearance of photons in the Big Bang Theory.
  • A later reply reiterates the timing of photon appearance, stating they appeared at the very beginning of the universe.
  • One participant expresses appreciation for the term 'leptogenesis' in a lighthearted manner.

Areas of Agreement / Disagreement

Participants present competing views regarding the formation of nucleons and electrons, with no consensus reached on the specifics of their origins or the processes involved.

Contextual Notes

The discussion includes references to processes like baryogenesis and leptogenesis, which may depend on specific definitions and assumptions that are not fully explored. The timing of photon appearance is mentioned but lacks detailed context.

sruthisupriya
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when we talk abt BBN, we only talk abt the nucleons. whr did th electrons come from? was it just beta decay or something else?
 
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Actually nucleons did not form during big-bang nucleosynthesis. The big-bang nucleosynthesis fuses them into light elements, fixing relative abundances of the elements. The nucleons formed previously in a period or process called baryogenesis. For electrons, the corresponding process is called leptogenesis.
 
At what time frame do photon's appear in the current Big Bang Theory?
 
At what time frame do photon's appear in the current Big Bang Theory?

At the very beginning.
 
hellfire said:
Actually nucleons did not form during big-bang nucleosynthesis. The big-bang nucleosynthesis fuses them into light elements, fixing relative abundances of the elements. The nucleons formed previously in a period or process called baryogenesis. For electrons, the corresponding process is called leptogenesis.

'Leptogenesis'. That's such a beautiful word! Now to casually drop that into a conversation when buying milk.
 

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