Quote:
I have two questions to both Antonio as well as Guille.
a) Why did the concept of parallel universes come into being?
b) What did this concept help solve in our quest of Theory of Everything.
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I think the idea of parallel universe can help explain the CPT Theorem although the folowing site is not complete
http://scienceworld.wolfram.com/physics/CPTTheorem.html
this theorem implies the simultaneous symmetry conservation or property invariance of charge conjugation, parity conservation and time inversion.
the TOE needed must be applicable to both universes. What it cannot solve in this universe can be solved in the other.
personal endnote: as for me, the parallel universe is where i go when i die.