155 citations · 470 across the 14 of their papers we have counts for
6 papers · 1 filter
Primordial perturbations with pre-inflationary bounce
Yong Cai, Yu-Tong Wang, Jin-Yun Zhao +1
Based on the effective field theory (EFT) of nonsingular cosmologies, we build a stable model, without the ghost and gradient instabilities, of bounce inflation (inflation is prece…
Higher order derivative coupling to gravity and its cosmological implications
Yong Cai, Yun-Song Piao
We show that the operator in effective field theory is significant for avoiding the instability of nonsingular bounce, where and are the three-dimens…
A covariant Lagrangian for stable nonsingular bounce
Yong Cai, Yun-Song Piao
The nonsingular bounce models usually suffer from the ghost or gradient instabilities, as has been proved recently. In this paper, we propose a covariant effective theory for stabl…
Probing the primordial universe with gravitational waves detectors
Yu-Tong Wang, Yong Cai, Zhi-Guo Liu +1
The spectrum of primordial gravitational waves (GWs), especially its tilt , carries significant information about the primordial universe. Combining recent aLIGO and Planck201…
Test of parametrized post-Newtonian gravity with galaxy-scale strong lensing systems
Shuo Cao, Xiaolei Li, Marek Biesiada +3
Based on a mass-selected sample of galaxy-scale strong gravitational lenses from the SLACS, BELLS, LSD and SL2S surveys and using a well-motivated fiducial set of lens-galaxy param…
The Effective Field Theory of nonsingular cosmology: II
Yong Cai, Hai-Guang Li, Taotao Qiu +1
Based on the Effective Field Theory (EFT) of cosmological perturbations, we explicitly clarify the pathology in nonsingular cubic Galileon models and show how to cure it in EFT wit…