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snorkack
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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.snorkack said:What are the observational constraints on the net lepton number of universe?
The Lepton Number of the Universe refers to the total number of leptons (particles that do not interact via the strong nuclear force) present in the universe. This includes particles such as electrons, neutrinos, and their antiparticles.
Yes, the total Lepton Number of the Universe is believed to be conserved. This means that the number of leptons in the universe remains constant over time, and cannot be created or destroyed.
The Big Bang Theory suggests that the early universe was filled with high-energy particles, including leptons. As the universe expanded and cooled, these particles began to combine and form the matter we see today. The total Lepton Number of the Universe is thought to have been set during this early period.
In certain rare processes, such as some types of radioactive decay or particle interactions, the Lepton Number of the Universe can change. However, these changes are very small and do not significantly affect the overall Lepton Number of the Universe.
The Lepton Number of the Universe is important to study because it provides clues about the fundamental laws of physics and the early universe. Any discrepancies or changes in the Lepton Number could point to new particles or interactions that have yet to be discovered.