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2017

Spinor driven cosmic bounces and their cosmological perturbations

Farnsworth, Shane, Lehners, Jean-Luc, Qiu, Taotao

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When coupling fermions to gravity, torsion is naturally induced.

We consider the possibility that fermion bilinears can act as a source for torsion, altering the dynamics of the early universe such that the big bang gets replaced with a classical non-singular bounce.
We extend previous studies in several ways: we allow more general fermion couplings, consider both commuting and anti-commuting spinors, and demonstrate that with an appropriate choice of potential one can easily obtain essentially arbitrary equations of state, including violations of the null energy condition, as required for a bounce.
As an example, we construct a model of ekpyrotic contraction followed by a non-singular bounce into an expanding phase.

Spinor driven cosmic bounces and their cosmological perturbations · Around

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