11 citations · 11 across the 13 of their papers we have counts for
16 papers
Dynamical thin shells in black hole ringdown
Han-Wen Hu, Chen Lan, Zong-Kuan Guo
We study how a radially oscillating thin shell outside a black hole (BH) affects gravitational wave ringdown and derive matching conditions for polar and axial perturbations from t…
Effects of Poisson Isocurvature Perturbations on Induced Gravitational Waves
Zi-An Zhou, Cheng-Jun Fang, Zong-Kuan Guo
A sudden transition from an early matter-dominated era to a radiation-dominated era provides a representative mechanism for enhancing induced gravitational waves (GWs). In the prim…
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…
Parametric resonance amplification of gravitational waves in dynamical Chern-Simons gravity
Han-Wen Hu, Chen Lan, Zong-Kuan Guo
Within the effective field theory of dynamical Chern-Simons (dCS) gravity, we study parametric resonance amplification of gravitational waves driven by an oscillating environmental…
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…
Nonminimally coupled quintessence with sign-switching interaction
Jia-Qi Wang, Rong-Gen Cai, Zong-Kuan Guo +3
We propose a new nonminimally coupled quintessence model to account for the late-time dark energy dynamics indicated by recent Dark Energy Spectroscopic Instrument (DESI) measureme…
Localized Steps toward ACT-Favored Inflation
Kai-Ge Zhang, Chengjie Fu, Jian-Feng He +1
Recent ACT measurements favor a scalar spectral index larger than the Planck value, posing a challenge to many single-field slow-roll inflation models. We show that a smooth, local…
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…
Parity violating spectral dynamics of black holes in dynamical Chern-Simons gravity
Han-Wen Hu, Chen Lan, Zong-Kuan Guo
We study how environmentally driven spectral instabilities of quasinormal modes respond to parity violating gravito-scalar coupling in black holes. Focusing on dynamical Chern-Simo…
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…