论文

论文

Bounce in general relativity and higher-order derivative operators
论文题目: Bounce in general relativity and higher-order derivative operators
作者: Ye, Gen; Piao, Yun-Song
刊物名称: PHYSICAL REVIEW D
: 2019
: 99
: 8
: 84019
摘要: 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 higher-order derivative operators of the 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.