Universe or Multiverse?: Quarks, electrons and atoms in closely related universes

  title={Universe or Multiverse?: Quarks, electrons and atoms in closely related universes},
  author={Craig Hogan},
  journal={arXiv: Astrophysics},
  • C. Hogan
  • Published 5 July 2004
  • Physics
  • arXiv: Astrophysics
In a model where a multiverse wavefunction explores a multitude of vacua with different symmetries and parameters, properties of universes closely related to ours can be understood by examining the consequences of small departures of physical parameters from their observed values. The masses of the light fermions that make up the stable matter of which we are made-- the up and down quarks, and the electron-- have values in a narrow window that both allows a variety of nuclei other than protons… 

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