This note offers a methodological observation, not a completed theory. In three distinct contexts — Dirac’s negative-energy solutions, the second branch of the original Schwarzschild solution, and the heavy eigenstate of the neutrino seesaw mechanism — the mathematics presents a formally necessary object that initially seems physically absurd or inaccessible. In one case (Dirac/antimatter), taking that object seriously revolutionized physics. This note asks: what if we took the other two equally seriously? A schematic connection to bimetric gravity is sketched, not as a derivation, but solely to make the question concrete and toinvite specialists in neutrino physics and general relativity to explore whether the parallel might reflect a deeper unity. The author is an applied physicist without specialist expertise in either field; this note is an invitation, not a claim.
Gregory Zeyer (Fri,) studied this question.