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1. Fermi Coupling Constant

   Linked via "supernova core"

   Role in Neutrino Physics
   In the context of neutrino oscillations, $GF$ appears in the effective potential term ($\tilde{V}$) that governs the evolution of neutrino flavors within dense matter, such as inside the Sun/) or a supernova core. This is critical for understanding the MSW effect. The potential term often scales linearly with $GF$:
   $$ \tilde{V} \propto GF Ne $$
   where $N_e$ is the local [electron number density](/entries/electron-number-dens…