Higher order derivative coupling to gravity and its cosmological implications
Higher order derivative coupling to gravity and its cosmological implications
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引力的高阶导数耦合及其宇宙学含义
DOI：
10.1103/physrevd.96.124028
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发表时间：
2017-07
期刊：
影响因子：
--
通讯作者：
Piao Yun-Song
中科院分区：
文献类型：
--
作者：
Cai Yong;Piao Yun-Song
We show that the R-(3)delta K operator in effective field theory is significant for avoiding the instability of nonsingular bounce, where R-(3) and K-mu nu are the three-dimensional Ricci scalar and the extrinsic curvature on the spacelike hypersurface, respectively. We point out that the covariant Lagrangian of R-(3)delta K, i.e., L-R(3)delta K, has the second order derivative couplings of scalar field to gravity which do not appear in Horndeski theory or its extensions but does not bring the Ostrogradski ghost. We also discuss the possible effect of L-R(3)delta K on the primordial scalar perturbation in the inflation scenario.
