31 citations · 117 across the 22 of their papers we have counts for
22 papers
Angular power spectrum of induced gravitational waves: breaking model and parameter degeneracies in PTA observations
Peng-Yu Wu, Di Wu, Jing-Zhi Zhou
Large primordial curvature and tensor perturbations on small scales can generate second-order tensor-scalar induced gravitational waves (TSIGWs) through scalar-scalar, tensor-scala…
Inflation on the lattice: scalar Gauss-Bonnet single field inflation
Fei-Yu Chen, Jing-Zhi Zhou, Zhi-Chao Li +1
We use lattice methods to study inflation in the scalar Gauss-Bonnet (SGB) gravity theory. We focus on the ultra-slow-roll scenario with the peak frequency falls into the PTA band.…
Scalar induced gravitational waves as probes of dark QCD
Wan-Zhe Feng, Ao Li, Jing-Zhi Zhou
We investigate scalar induced gravitational waves (SIGWs) as probes of a dark QCD crossover. Motivated by twin Higgs and asymmetric twin baryon dark matter scenarios, we consider a…
Tensor induced gravitational waves
Fei-Yu Chen, Jing-Zhi Zhou, Di Wu +2
Primordial gravitational waves on small scales are not tightly constrained by current cosmological observations, which allows for the possibility of large amplitudes at small scale…
Probing small-scale primordial power spectra with induced gravitational waves
Di Wu, Zhi-Chao Li, Peng-Yu Wu +2
Large-scale primordial perturbations have been well constrained by current cosmological observations, but the properties of small-scale perturbations remain elusive. This study foc…
Cosmological constraints on small-scale primordial non-Gaussianity
Jing-Zhi Zhou, Zhi-Chao Li, Di Wu
In contrast to the large-scale primordial power spectrum and primordial non-Gaussianity , which are strictly constrained, the small-scale $\math…
Can tensor-scalar induced GWs dominate PTA observations ?
Di Wu, Jing-Zhi Zhou, Yu-Ting Kuang +3
Observational constraints on small-scale primordial gravitational waves are considerably weaker than those on large scales. We focus on scenarios with significant primordial gravit…
Constraints on primordial black holes from : scalar induced gravitational waves as an extra radiation component
Jing-Zhi Zhou, Yu-Ting Kuang, Zhe Chang +1
In June 2023, multiple pulsar timing array collaborations provided evidence for the existence of a stochastic gravitational wave background. Scalar induced gravitational waves (SIG…
Scalar induced gravitational waves in f(R) gravity
Jing-Zhi Zhou, Yu-Ting Kuang, Di Wu +3
We investigate the first and second order cosmological perturbation equations in f(R) modified gravity theory and provide the equation of motion of second order scalar induced grav…
Induced gravitational waves for arbitrary higher orders: vertex rules and loop diagrams in cosmological perturbation theory
Jing-Zhi Zhou, Yu-Ting Kuang, Di Wu +2
Gravitational waves induced by primordial perturbations serve as crucial probes for studying the early universe, providing a significant window into potential new physics during co…
Probing scalar induced gravitational waves with PTA and LISA: The Importance of third order correction
Zhe Chang, Yu-Ting Kuang, Di Wu +1
We revisit the calculation of third order \acp{SIGW} and extend it from a monochromatic primordial power spectrum to a more general log-normal one. We investigate the impact of thi…
New constraints on primordial non-Gaussianity from missing two-loop contributions of scalar induced gravitational waves
Zhe Chang, Yu-Ting Kuang, Di Wu +2
We analyze the energy density spectrum of \acp{SIGW} using the NANOGrav 15-year data set, thereby constraining the primordial non-Gaussian parameter . For the firs…
Probing small-scale anisotropic inflation with stochastic gravitational-wave background
Yu-Ting Kuang, Jing-Zhi Zhou, Zhe Chang +1
In June 2023, multiple pulsar timing array (PTA) collaborations provided evidence for the existence of a stochastic gravitational-wave background (SGWB). As a significant source of…
Primordial black holes and scalar induced density perturbations: the effects of probability density functions
Jing-Zhi Zhou, Yu-Ting Kuang, Zhe Chang +2
We investigate the second order energy density perturbation induced by small-scale Gaussian and local-type non-Gaussian primordial curvature perturbations. The relative a…
Pulsars as candidates of LHAASO sources J2226+6057, J1908+0621 and J1825-1326: The leptonic origin
Zhe Chang, Yu-Ting Kuang, Xukun Zhang +1
Recently, from 12 -ray Galactic sources, the LHAASO has detected ultrahigh-energy photons up to 1.4PeV. The -ray spectra of the sources J2226+6057, J1908+0621, J1825-1326 and…
Primordial gravitational waves and curvature perturbations induced energy density perturbation
Zhe Chang, Yu-Ting Kuang, Xukun Zhang +1
We study the second order scalar and density perturbations generated by the Gaussian curvature perturbations and primordial gravitational waves in the radiation-dominated era. Afte…
Pulsars as candidates of LHAASO sources J2226+6057, J1908+0621 and J1825-1326
Zhe Chang, Xukun Zhang, Jing-Zhi Zhou
The LHAASO Collaboration has observed ultrahigh-energy photons up to PeV from -ray Galactic sources. In particular, the -ray spectra of the sources J2226+6057, J190…
Primordial black holes and third order scalar induced gravitational waves
Zhe Chang, Yu-Ting Kuang, Xukun Zhang +1
The process of \acp{PBH} formation would be inevitably accompanied by \acp{SIGW}. This strong correlation between \acp{PBH} and \acp{SIGW} signals could be a promising approach to…
Gravitational waves from primordial scalar and tensor perturbations
Zhe Chang, Xukun Zhang, Jing-Zhi Zhou
We investigate the second order gravitational waves induced by the primordial scalar and tensor perturbations during radiation-dominated era. The explicit expressions of the power…
Impact of the free-streaming neutrinos to the second order induced gravitational waves
Xukun Zhang, Jing-Zhi Zhou, Zhe Chang
The damping effect of the free-streaming neutrinos on the second order gravitational waves is investigated in detail. We solve the Boltzmann equation and give the anisotropic stres…
The cosmological vector modes from a monochromatic primordial power spectrum
Zhe Chang, Xukun Zhang, Jing-Zhi Zhou
The cosmological background of higher order vector modes can be generated by the first order scalar perturbations. We investigate the second order and the third order vector modes…
The Third Order Scalar Induced Gravitational Waves
Jing-Zhi Zhou, Xukun Zhang, Qing-Hua Zhu +1
Since the gravitational waves were detected by LIGO and Virgo, it has been promising that lots of information about the primordial Universe could be learned by further observations…