10 papers
Broadband Chiral Primordial Gravitational Waves from Constant-roll Inflation in Parity-violating Symmetric Teleparallel Gravity
Xu Zhang, Chang Liu, Chengjie Fu
We investigate primordial gravitational waves (GWs) generated during constant-roll inflation in a parity-violating extension of symmetric teleparallel gravity. The parity-violating…
Bridging inflation and reheating: chiral gravitational waves from aHz to GHz
Chengjie Fu, Chao Chen, Yi Wang
In this paper, we investigate chiral gravitational wave (GW) signals generated from inflation to reheating, driven by a parity-violating (PV) term coupled to the inflaton, $\dotÏÎ…
Axion Inflation from Heavy-Fermion One-Loop Effects
Kai-Ge Zhang, Jian-Feng He, Chengjie Fu +1
We derive a one-loop effective description of axion inflation by integrating out a heavy Dirac fermion with an inflaton-dependent complex mass undergoing a smooth localized thresho…
Primordial Gravitational Waves in Parity-violating Symmetric Teleparallel Gravity
Rongrong Zhai, Chengjie Fu, Xiangyun Fu +2
In this paper, we investigate the inflationary phenomenology of parity-violating (PV) extensions of symmetric teleparallel gravity by applying this PV gravity theory to axion infla…
Suppression of scalar perturbations due to a heavy axion
Kai-Ge Zhang, Jian-Feng He, Chengjie Fu +1
A fast-rolling axion can transfer its kinetic energy to gauge fields via the Chern-Simons coupling, leading to copious production of gauge quanta during inflation. The amplified ga…
Gravitational Waves from Gauge Quanta Produced during Inflation
Kai-Ge Zhang, Jian-Feng He, Chengjie Fu +1
A fast-rolling axion can transfer its kinetic energy to a gauge field via the Chern-Simons coupling, leading to copious production of gauge quanta, which can act as a source of gra…