129 citations · 561 across the 16 of their papers we have counts for
16 papers
Non-minimal coupling in light of ACT
Qing Gao, Yungui Gong, Zhu Yi +1
The latest ACT data release disfavors the attractor . In inflationary models with nonminimal coupling, such attractors typically arise in the strong coupling limit. To a…
Scalar induced gravitational waves in chiral scalar-tensor theory of gravity
Jia-Xi Feng, Fengge Zhang, Xian Gao
We study the scalar induced gravitational waves (SIGWs) from a chiral scalar-tensor theory of gravity. The parity-violating (PV) Lagrangian contains the Chern-Simons (CS) term and…
Scalar induced gravitational waves in metric teleparallel gravity with the Nieh-Yan term
Fengge Zhang, Jia-Xi Feng, Xian Gao
We investigate the scalar induced gravitational waves (SIGWs) in metric teleparallel gravity with the Nieh-Yan (NY) term, which results in parity violation during the radiation-dom…
Scalar induced gravitational waves in light of Pulsar Timing Array data
Zhu Yi, Qing Gao, Yungui Gong +2
The power-law parametrization for the energy density spectrum of gravitational wave (GW) background is a useful tool to study its physics and origin. While scalar induced secondary…
Scalar induced gravitational waves in symmetric teleparallel gravity with a parity-violating term
Fengge Zhang, Jia-Xi Feng, Xian Gao
Gravitational waves (GWs) are useful to test gravitational theories and to probe the physics in the early universe. In this paper, we investigate the scalar induced gravitational w…
Scalar induced gravitational waves from Chern-Simons gravity during inflation era
Jia-Xi Feng, Fengge Zhang, Xian Gao
We investigate the scalar induced gravitational waves (SIGWs) in the Chern-Simons (CS) gravity with a dynamical scalar field during slow roll inflation. Due to the parity violation…
Circularly polarized scalar induced gravitational waves from the Chern-Simons modified gravity
Fengge Zhang, Jia-Xi Feng, Xian Gao
We investigate the scalar induced gravitational waves (SIGWs) in the Chern-Simons (CS) modified gravity during the radiation dominated era. The SIGWs are circularly polarized, whic…
Primordial black holes and scalar induced gravitational waves from the model with a Gauss-Bonnet term
Fengge Zhang
We study an inflationary model with the Gauss-Bonnet coupling, which can enhance the curvature perturbation at small scales and thus produce a significant abundance of primordi…
Primordial black holes and scalar induced gravitational waves from Higgs inflation with non-canonical kinetic term
Jiong Lin, Shengqing Gao, Yungui Gong +3
We resolve the potential-restriction problem in K/G inflation by introducing nonminimal coupling. In this context, Higgs field successfully drives inflation satisfying CMB observat…
Double-peaked inflation model: Scalar induced gravitational waves and primordial-black-hole suppression from primordial non-Gaussianity
Fengge Zhang, Jiong Lin, Yizhou Lu
A significant abundance of primordial black hole (PBH) dark matter can be produced by curvature perturbations with power spectrum $Δ_ζ^2(k_{\mathrm{peak}})\sim \mathcal{O}(10^{-2})…
Primordial Non-Gaussianity from G-inflation
Fengge Zhang, Yungui Gong, Jiong Lin +2
Enormous information about interactions is contained in the non-Gaussianities of the primordial curvature perturbations, which are essential to break the degeneracy of inflationary…
Spatially covariant gravity with a dynamic lapse function
Jiong Lin, Yungui Gong, Yizhou Lu +1
In the framework of spatially covariant gravity, it is natural to extend a gravitational theory by putting the lapse function and the spatial metric on an equal footin…
On the waveform of the scalar induced gravitational waves
Fengge Zhang, Arshad Ali, Yungui Gong +2
The scalar induced gravitational waves (SIGWs) is a useful tool to probe the physics in the early universe. To study inflationary models with this tool, we need to know how the wav…
Gauge transformation of scalar induced gravitational waves
Yizhou Lu, Arshad Ali, Yungui Gong +2
The gauge dependence of the scalar induced gravitational waves (SIGWs) generated at the second order imposes a challenge to the discussion of the secondary gravitational waves gene…
Primordial black holes and secondary gravitational waves from k/G inflation
Jiong Lin, Qing Gao, Yungui Gong +3
The possibility that in the mass range around most of dark matter constitutes of primordial black holes (PBHs) is a very interesting topic. To produce PBHs with…
Constraints on primordial curvature perturbations from primordial black hole dark matter and secondary gravitational waves
Yizhou Lu, Yungui Gong, Zhu Yi +1
Primordial black holes and secondary gravitational waves can be used to probe the small scale physics at very early time. For secondary gravitational waves produced after the horiz…