Abstract
The coupledDirac-Einstein equations for a homogeneous isotropic space-time forbid aclosed universe but lead to the standard cosmological model for aflat universe. Therefore only theopen universe is left as a nontrivial situation. There some of the desired cosmological effects emerge in a natural way:inflation, creation ex nihilo, etc.
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Ochs, U., Sorg, M. Fermions and expanding universe. Int J Theor Phys 32, 1531–1547 (1993). https://doi.org/10.1007/BF00672854
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DOI: https://doi.org/10.1007/BF00672854