164 citations · 1.1k across the 30 of their papers we have counts for
22 papers · 1 filter
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…
Enhancement of small-scale induced gravitational waves from the soliton/oscillon domination
Xiao-Bin Sui, Jing Liu, Rong-Gen Cai
We investigate density fluctuations and scalar-induced gravitational waves (GWs) arising from the production of long-lived solitons and oscillons, which can dominate the early Univ…
Detecting the dark sector through scalar-induced gravitational waves
Xiao-Bin Sui, Jing Liu, Xing-Yu Yang +1
We investigate the evolution of cosmological scalar perturbations in the case that the background radiation is weakly coupled to a light scalar field . The light scalar is a…
Constraints on ultra-slow-roll inflation with the NANOGrav 15-Year Dataset
Bo Mu, Jing Liu, Gong Cheng +1
Ultra-slow-roll~(USR) inflation predicts an exponential amplification of scalar perturbations at small scales, which leads to a stochastic gravitational wave background~(SGWB) thro…
Explaining Pulsar Timing Array Observations with Primordial Gravitational Waves in Parity-Violating Gravity
Chengjie Fu, Jing Liu, Xing-Yu Yang +2
The pulsar timing array (PTA) collaborations have recently suggested the presence of a gravitational wave background at nano-Hertz frequencies. In this paper, we explore potential…
Distinguishing the nanohertz gravitational-wave sources by the observations of compact dark matter subhalos
Jing Liu
The latest pulsar timing array data reveals evidence of nanohertz gravitational waves (GWs), which have been explained by both cosmological and astrophysical sources. However, curr…
Enhanced curvature perturbations from spherical domain walls nucleated during inflation
Zhen-Min Zeng, Jing Liu, Zong-Kuan Guo
We investigate spherical domain walls~(DWs) nucleated via quantum tunneling in multifield inflationary models and curvature perturbations induced by the inhomogeneous distribution…
Constraints on ultra-slow-roll inflation from the third LIGO-Virgo observing run
Bo Mu, Gong Cheng, Jing Liu +1
The nonattractor evolution in ultra-slow-roll (USR) inflation results in the amplification of superhorizon curvature perturbations and then induces a strong and detectable stochast…
Constraining first-order phase transitions with curvature perturbations
Jing Liu, Ligong Bian, Rong-Gen Cai +2
We investigate the curvature perturbations induced by the randomness of the quantum tunneling process during cosmological first-order phase transitions (PTs) and for the first time…
A New Picture of Cosmic String Evolution and Anisotropic Stochastic Gravitational-Wave Background
Rong-Gen Cai, Zong-Kuan Guo, Jing Liu
We investigate the anisotropies of the stochastic gravitational-wave background (SGWB) produced by cosmic strings associated with the spontaneous U(1) symmetry breaking of Grand Un…
Gravitational waves from resonant amplification of curvature perturbations during inflation
Zhi-Zhang Peng, Chengjie Fu, Jing Liu +2
Parametric resonance in a single-field inflationary model with a periodic structure on the potential gives rise to curvature perturbations with large amplitudes on small scales, wh…
Primordial black hole production during first-order phase transitions
Jing Liu, Ligong Bian, Rong-Gen Cai +2
Primordial black holes (PBHs) produced in the early Universe have attracted wide interest for their ability to constitute dark matter and explain the compact binary coalescence. We…
Dependence of the amplitude of gravitational waves from preheating on the inflationary energy scale
Rong-Gen Cai, Zong-Kuan Guo, Pei-Ze Ding +2
Stochastic gravitational wave backgrounds (SGWBs) receive increasing attention and provide a new possibility to directly probe the early Universe. In the preheating process at the…
Magnetic field and gravitational waves from the first-order Phase Transition
Yuefeng Di, Jialong Wang, Ruiyu Zhou +3
We perform the three dimensional lattice simulation of the magnetic field and gravitational wave productions from bubble collisions during the first-order electroweak phase transit…
Large anisotropies of the stochastic gravitational wave background from cosmic domain walls
Jing Liu, Rong-Gen Cai, Zong-Kuan Guo
We investigate the stochastic gravitational wave background (SGWB) from cosmic domain walls (DWs) caused by quantum fluctuations of a light scalar field during inflation. Pertu…
On the gravitational wave sources from the NANOGrav 12.5-yr data
Ligong Bian, Rong-Gen Cai, Jing Liu +2
The NANOGrav Collaboration recently reported a strong evidence for a stochastic common-spectrum process in the pulsar-timing data. We evaluate the evidence of interpreting this pro…
An analytical approximation of the scalar spectrum in the ultra-slow-roll inflationary models
Jing Liu, Zong-Kuan Guo, Rong-Gen Cai
The ultra-slow-roll (USR) inflationary models predict large-amplitude scalar perturbations at small scales which can lead to the primordial black hole production and scalar-induced…
Primordial black holes and gravitational waves from parametric amplification of curvature perturbations
Rong-Gen Cai, Zong-Kuan Guo, Jing Liu +2
We investigate a new mechanism to create large curvature perturbations on small scales due to parameter resonance in a single-field inflationary model with a small periodic structu…
Primordial Black Holes from Cosmic Domain Walls
Jing Liu, Zong-Kuan Guo, Rong-Gen Cai
We investigate the formation of primordial black holes (PBHs) from the collapse of spherically symmetric domain wall bubbles, which spontaneously nucleate via quantum tunneling dur…
Low-frequency Gravitational Waves from Double-inflection-point Inflation
Wu-Tao Xu, Jing Liu, Tie-Jun Gao +1
We study the production of gravitational waves from primordial scalar perturbations in double-inflection-point inflation, in which one of the inflection points predicts the power s…
Gravitational wave production after inflation with cuspy potentials
Jing Liu, Zong-Kuan Guo, Rong-Gen Cai +1
We investigate the effect of the cuspiness of scalar potentials on the production of gravitational waves during oscillon formation after inflation. We consider a more general form…
Gravitational Waves from Oscillons with Cuspy Potentials
Jing Liu, Zong-Kuan Guo, Rong-Gen Cai +1
We study the production of gravitational waves during oscillations of the inflaton around the minimum of a cuspy potential after inflation. We find that a cusp in the potential can…