144 citations · 587 across the 16 of their papers we have counts for
10 papers · 1 filter
Explaining Pulsar Timing Array Observations with Primordial Gravitational Waves in Parity-Violating Gravity
Chengjie Fu, Jing Liu, Xing-Yu Yang +2
The pulsar timing array (PTA) collaborations have recently suggested the presence of a gravitational wave background at nano-Hertz frequencies. In this paper, we explore potential…
Sudden braking and turning with a two-field potential bump: primordial black hole formation
Chengjie Fu, Chao Chen
We investigate the amplification of curvature perturbations in a two-field inflation model featuring a Gaussian potential bump. When the inflaton encounters a potential bump along…
Primordial black holes and induced gravitational waves from double-pole inflation
Chengjie Fu, Shao-Jiang Wang
The primordial black hole (PBH) productions from the inflationary potential with an inflection point usually rely heavily on the fine-tuning of the model parameters. We propose in…
Parity violation in stochastic gravitational wave background from inflation
Rong-Gen Cai, Chengjie Fu, Wang-Wei Yu
We study the inflationary implications of a novel parity-violating gravity model, which modifies the teleparallel equivalent of general relativity by introducing the Nieh-Yan term…
Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field
Rong-Gen Cai, Chao Chen, Chengjie Fu
We investigate the enhancement of the curvature perturbations in a single-field slow-roll inflation with a spectator scalar field kinetically coupled to the inflaton. The coupling…
Gravitational waves from resonant amplification of curvature perturbations during inflation
Zhi-Zhang Peng, Chengjie Fu, Jing Liu +2
Parametric resonance in a single-field inflationary model with a periodic structure on the potential gives rise to curvature perturbations with large amplitudes on small scales, wh…
Primordial black holes and oscillating gravitational waves in slow-roll and slow-climb inflation with an intermediate non-inflationary phase
Chengjie Fu, Puxun Wu, Hongwei Yu
We propose a new single field inflation model in which the usual slow-roll inflation is joined to a new period of slow-climb and slow-roll inflation through a short intermediate no…
Scalar induced gravitational waves in inflation with gravitationally enhanced friction
Chengjie Fu, Puxun Wu, Hongwei Yu
We study the scalar induced gravitational wave (GW) background in inflation with gravitationally enhanced friction (GEF). The GEF mechanism, which is realized by assuming a nonmini…
Primordial Black Holes from Inflation with Nonminimal Derivative Coupling
Chengjie Fu, Puxun Wu, Hongwei Yu
We propose a novel enhancement mechanism of the curvature perturbations in the nonminimal derivative coupling inflation model with a coupling parameter related to the inflaton fiel…
Nonlinear preheating with nonminimally coupled scalar fields in the Starobinsky model
Chengjie Fu, Puxun Wu, Hongwei Yu
We study the preheating after inflation in the Starobinsky model with a nonminimally coupled scalar field . Using the lattice simulation, we analyze the rescattering between the…