5 citations · 16 across the 11 of their papers we have counts for
11 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…
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…
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…
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…
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…
The power of SKA to Constrain cosmological gravitational-wave backgrounds below the astrophysical foreground noise
Chengjie Fu, Jing Liu
The inspirals of supermaissive black hole binaries provide a convinced gravitational wave background in the nHz band, serving as the fiducial model of the recent gravitational wave…
Strong backreaction of gauge quanta produced during inflation
Jian-Feng He, Kai-Ge Zhang, Chengjie Fu +1
During inflation an axion field coupled to a gauge field through a Chern-Simons term can trigger the production of gauge quanta due to a tachyonic instability. The amplification of…
Constraining inflation with nonminimal derivative coupling with the Parkes Pulsar Timing Array third data release
Chang Han, Li-Yang Chen, Zu-Cheng Chen +13
We study an inflation model with nonminimal derivative coupling that features a coupling between the derivative of the inflaton field and the Einstein tensor. This model naturally…
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, $\dotϕε^…
Origin of Black Hole Spin in Lower-Mass-Gap Black Hole-Neutron Star Binaries
Ying Qin, Zhen-Han-Tao Wang, Georges Meynet +8
During the fourth observing run, the LIGO-Virgo-KAGRA Collaboration reported the detection of a coalescing compact binary (GW230529181500) with component masses estimated at…
Gravitational Waves from a Gauge Field Non-minimally Coupled to Gravity
Jian-Feng He, Chengjie Fu, Kai-Ge Zhang +1
An axion-like spectator during inflation can trigger a tachyonic instability which amplifies the modes of one of the helicities of the gauge field, resulting in the production of p…