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05 Feb

What is Life?

A white cat plays with a ball in a box, with a skeleton cat in the same pose diagonally across from it.

If parallel universes exist, there is one in which Eamon de Valera lived out his days as a maths teacher. In that universe, Edwin Schrödinger never came to Dublin, and probably never wrote What is Life?.

Edwin Schrödinger fled Berlin and Nazism in 1933, travelling to Oxford (where he heard he had won the Nobel Prize) and Princeton. The famous Schrödinger’s cat paradox appeared in his essay The present situation in quantum mechanics (1935), based on the Copenhagen Interpretation of quantum physics. A thought experiment where a cat sealed in a box either lived or died depending on whether a quantum event occurred, it seemed to suggest two universes, one with a dead cat and one with a living cat, existed in parallel until an observer saw whether the cat was alive or dead.
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