155 citations · 1.2k across the 32 of their papers we have counts for
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gr-qc2022★ 26 cited
Generating enhanced parity-violating gravitational waves during inflation with violation of the null energy condition
Yong Cai
A violation of the null energy condition (NEC) during inflation in a single-field inflation model will naturally enhance the amplitude of the parity violation effect (defined by $Δ…
gr-qc2022★ 18 cited
Perturbative unitarity and NEC violation in genesis cosmology
Yong Cai, Ji Xu, Shuai Zhao +1
Explorations of the violation of null energy condition (NEC) in cosmology could enrich our understanding of the very early universe and the related gravity theories. Although a ful…
gr-qc2022★ 23 cited
Generating enhanced primordial GWs during inflation with intermittent violation of NEC and diminishment of GW propagating speed
Yong Cai, Yun-Song Piao
We investigate both the null energy condition (NEC) violating scenario and the -diminishing scenario for generating enhanced power spectrum of primordial gravitational waves (…