I Uncovering the Hidden Lepton Number of the Universe

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The discussion focuses on the observational constraints regarding the net lepton number of the universe, emphasizing the potential for a significant lepton number to be concealed within neutrinos. It highlights that sphaleron processes in the early universe could lead to a lepton number comparable to the baryon number, unless lepton number violation occurs post-sphaleron freeze-out. The implications of these processes are crucial for understanding the universe's composition and evolution. The conversation underscores the need for further exploration into lepton number violations to clarify these constraints. Understanding the hidden lepton number is essential for advancing theoretical models of cosmology.
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What are the observational constraints on the net lepton number of universe?
 
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snorkack said:
What are the observational constraints on the net lepton number of universe?
You could theoretically hide a huge lepton number in neutrinos that you cannot see. The expectation based on sphaleron processes in the early Universe would be comparable to the baryon number unless you introduce some relevant lepton number violation that is active after sphalerons freeze out.
 

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