Heuristic lower bound on mass of neutrino

We increase the standard IR-cutoffs of the minimum ponderable mass (~10⁻⁶⁸ kg) for neutrinos by exploiting the unchanging mass of fundamental particles since the Electroweak Epoch's conclusion and postulating that the causal horizon at time of mass acquisition bounds the Compton wavelength of elementary fermions up to ~7.4×10⁻⁴⁰ kg as a conditional phenomenological minimum.