11 citations · 14 across the 10 of their papers we have counts for
11 papers
Astrophysical Graviton Squeezing Can Be Hidden in the Far-Field
Cheng-Jun Fang, Zong-Kuan Guo, Zhen-Hong Lyu +3
While localized astrophysical sources can generate macroscopic graviton squeezing, their observable quantum signatures at far-field detectors remain unresolved. In this work, we in…
Fixing the Renormalization of Inflationary Loops via Ward Identities
Cheng-Jun Fang, Zong-Kuan Guo
Evaluating quantum loop corrections to curvature perturbations in non-attractor inflation presents theoretical ambiguities. A crucial aspect of this challenge lies in the unconstra…
Waveform stability of black hole ringdown with stochastic horizon structure
Han-Wen Hu, Cheng-Jun Fang, Zong-Kuan Guo
We examine the robustness of black hole ringdown to stochastic horizon-scale structure within an effective field framework in a proof-of-principle Schwarzschild setup.Consistent wi…
Low-finesse scattering and non-stationary dispersive dynamics of gravitational wave echoes
Han-Wen Hu, Cheng-Jun Fang, Zong-Kuan Guo
We study environmental echoes induced by a weak potential barrier outside a Schwarzschild black hole. In the low-finesse limit, the time domain response is governed by a sequence o…
One-loop corrections to infrared GWs is forbidden by symmetries
Cheng-Jun Fang, Han-Wen Hu, Zong-Kuan Guo
Small-scale scalar perturbations amplified during inflation can induce primordial gravitational waves through tensor-scalar interactions. A long-standing controversial issue is whe…
Bispectrum of induced gravitational waves in the poltergeist mechanism
Han-Wen Hu, Cheng-Jun Fang, Zhen-Min Zeng +1
In the poltergeist mechanism the enhancement of induced gravitational waves (GWs) occurs due to a sudden transition from an early matter-dominated era to the radiation-dominated er…
Ward Identity Constraints on Loop Corrections in Non-Attractor Inflation
Cheng-Jun Fang, Zhen-Hong Lyu, Chao Chen +1
The conservation of super-horizon curvature perturbations in strongly interacting inflationary models, particularly in the presence of quantum-loop corrections, remains a topic of…
Critical behavior and ultraviolet scaling of induced gravitational waves from an early matter-dominated era
Zhen-Min Zeng, Cheng-Jun Fang, Zong-Kuan Guo
Critical behavior and ultraviolet scaling of induced gravitational waves (GWs) from an early matter-dominated (eMD) era are studied in the context of primordial black hole evaporat…
Incorporating Backreaction in One-Loop Corrections in Ultra-Slow-Roll Inflation
Cheng-Jun Fang, Zhen-Hong Lyu, Chao Chen +1
We investigate the one-loop quantum correction to the power spectrum of primordial curvature perturbations in the ultra-slow-roll (USR) inflationary scenario, incorporating the bac…
Spectrum of third-order tensor perturbations induced by excited scalar fields
Cheng-Jun Fang, Zhi-Zhang Peng, Han-Wen Hu +1
We calculate for the first time the third-order spectrum of gravitational waves sourced by the amplified scalar field perturbations during inflation using the in-in formalism, and…
Tensor bispectrum mediated by an excited scalar field during inflation
Zhi-Zhang Peng, Cheng-Jun Fang, Zong-Kuan Guo
We calculate the tensor bispectrum mediated by an excited scalar field during inflation and find that the bispectrum peaks in the squeezed configuration, which is different from th…