| 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 |
| 年: | 2019 |
| 卷: | 99 |
| 期: | 8 |
| 页: | 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. |
