Bounce in GR and higher-order derivative operators

Research paper by Gen Ye, Yun-Song Piao

Indexed on: 24 Jan '19Published on: 24 Jan '19Published in: arXiv - General Relativity and Quantum Cosmology


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.