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论文题目:	Bounce in general relativity and higher-order derivative operators
论文题目英文:
作者:	Ye, Gen; Piao, Yun-Song
论文出处:
刊物名称:	PHYSICAL REVIEW D
年:	2019
卷:	99
期:	8
页:	84019
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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.
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