Observational constraints on the net lepton number of the universe

[snorkack]

What are the observational constraints on the net lepton number of universe?

 

[Orodruin]

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.