236 citations · 845 across the 21 of their papers we have counts for
4 papers · 1 filter
Trans-Planckian censorship of multistage inflation and dark energy
Hao-Hao Li, Gen Ye, Yong Cai +1
We explore the bound of the trans-Planckian censorship conjecture on an inflation model with multiple stages. We show that if the first inflationary stage is responsible for the pr…
Positivity in the effective field theory of cosmological perturbations
Gen Ye, Yun-Song Piao
Requiring the existence of a unitary, causal and local UV-completion places a set of positivity bounds on the corresponding effective field theories (EFTs). We discuss the obstruct…
Bounce in GR and higher-order derivative operators
Gen Ye, Yun-Song Piao
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 the…
Implication of GW170817 for cosmological bounces
Gen Ye, Yun-Song Piao
The detection of GW170817 and its electromagnetic counterpart has revealed the speed of gravitational waves coincides with the speed of light, . Inspired by the possibility…