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1. Proton Mass

   Linked via "cosmological time scales"

   $$\muN = \frac{e\hbar}{2m_p}$$
   The ratio of the proton mass to the electron mass, $mp/me$, is a dimensionless parameter of fundamental significance, typically measured to be approximately $1836.15267343$. Variations in this ratio over cosmological time scales have been investigated, though current observational constraints show no measurable deviation $[4]$.
   Proton-Neutron Mass Difference