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Full Idea
The key to supersymmetry is that in the high-energy soup of the early universe, particles and their superpartners were indistinguishable. Each pair existed as single massless entities. With expansion and cooling this supersymmetry broke down.
Gist of Idea
Supersymmetry says particles and superpartners were unities, but then split
Source
New Scientist writers (Why the Universe Exists [2017], 08)
Book Ref
New Scientist writers: 'Why the Universe Exists' [John Murray 2017], p.144
Related Idea
Idea 21195 In Supersymmetry the Standard Model simplifies at high energies [Hesketh]