Spinor fields admit non-singular solutions to the Dirac equation near big bang, big rip, and big brake singularities, allowing Fock space construction, whereas scalar fields yield singular solutions regardless of parametrization.
Wetterich, Eternal Universe, Phys
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Cosmological Singularities and Quantum Particles
Spinor fields admit non-singular solutions to the Dirac equation near big bang, big rip, and big brake singularities, allowing Fock space construction, whereas scalar fields yield singular solutions regardless of parametrization.