Bounce in GR and higher-order derivative operators
arXiv:1901.08283 · doi:10.1103/PhysRevD.99.084019
Abstract
Recent progress seems to suggest that one must modify General Relativity (GR) to stably violate the null energy condition and avoid the cosmological singularity. However, with the higher-order derivative operators of scalar field (a subclass of the degenerate higher-order scalar-tensor theory), we show that at energies well below the Planck scale, fully stable nonsingular cosmologies can actually be implemented within GR.
3 figures, matched published version in PhysRevD
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