75 citations · 505 across the 34 of their papers we have counts for
17 papers · 1 filter
Probing Graviton Mass with MeerKAT PTA and SKA-PTA Forecasts
Zhi-Chao Zhao, Sai Wang
In this study, we derive constraints on the graviton mass using the 4.5-year data release from the MeerKAT Pulsar Timing Array (MPTA) and provide forecasts for the upcoming Square…
Constraints on the Sum of Neutrino Masses from ACT DR6 and DESI DR2 Considering Isocurvature Initial Conditions
Hongsheng Hou, Sai Wang, Zhi-Chao Zhao +1
We present a robust assessment of cosmological constraints on the sum of neutrino masses () when relaxing the standard assumption of purely adiabatic primordial initial c…
Reassessing the SIGW Interpretation of PTA Signal: The Role of Third-Order Gravitational Waves and Implications for the PBH Overproduction
Zhi-Chao Zhao, Sai Wang, Qing-Hua Zhu +1
In light of recent interpretations attributing pulsar timing array (PTA) signal to second-order gravitational waves induced by linear cosmological curvature perturbations in the ea…
Isotropy, anisotropies and non-Gaussianity in the scalar-induced gravitational-wave background: diagrammatic approach for primordial non-Gaussianity up to arbitrary order
Jun-Peng Li, Sai Wang, Zhi-Chao Zhao +1
Produced nonlinearly by the enhanced linear cosmological curvature perturbations, the scalar-induced gravitational waves (SIGWs) can serve as a potentially powerful probe of primor…
Constraints on the lepton asymmetry from DESI DR2 BAO data
Zhi-Chao Zhao, Dong-Mei Xia, Sai Wang
It is important to explore the potential existence of lepton asymmetry in the neutrino sector. Conducting a joint analysis of DESI DR2 BAO data and \emph{Planck} 2018 CMB data, we…
Study of primordial non-Gaussianity and with the cross-correlations between the scalar-induced gravitational waves and the cosmic microwave background
Zhi-Chao Zhao, Sai Wang, Jun-Peng Li +1
The stochastic gravitational-wave background originating from cosmic sources contains vital information about the early universe. In this work, we comprehensively study the cross-c…
Angular bispectrum and trispectrum of scalar-induced gravitational waves: all contributions from primordial non-Gaussianity and
Jun-Peng Li, Sai Wang, Zhi-Chao Zhao +1
Studying the primordial non-Gaussianity of inflationary perturbations is crucial for testing the inflation paradigm of the early universe. In this work, we conduct a comprehensive…
Complete analysis of the background and anisotropies of scalar-induced gravitational waves: primordial non-Gaussianity and considered
Jun-Peng Li, Sai Wang, Zhi-Chao Zhao +1
Investigation of primordial non-Gaussianity holds immense importance in testing the inflation paradigm and shedding light on the physics of the early Universe. In this study, we co…
Unraveling the early universe's equation of state and primordial black hole production with PTA, BBN, and CMB observations
Qing-Hua Zhu, Zhi-Chao Zhao, Sai Wang +1
Pulsar timing array (PTA) data releases showed strong evidence for a stochastic gravitational-wave background in the nanohertz band. When the signal is interpreted by a scenario of…
Constraints On Scalar-Induced Gravitational Waves Up To Third Order From Joint Analysis of BBN, CMB, And PTA Data
Sai Wang, Zhi-Chao Zhao, Qing-Hua Zhu
Recently, strong evidence for a gravitational wave background has been reported by collaborations of pulsar timing arrays (PTA). In the framework of scalar-induced gravitational wa…
Implications of Pulsar Timing Array Data for Scalar-Induced Gravitational Waves and Primordial Black Holes: Primordial Non-Gaussianity Considered
Sai Wang, Zhi-Chao Zhao, Jun-Peng Li +1
Multiple pulsar-timing-array collaborations have reported strong evidence for the existence of a gravitational-wave background. We study physical implications of this signal for co…
Primordial Non-Gaussianity and Anisotropies in Scalar-Induced Gravitational Waves
Jun-Peng Li, Sai Wang, Zhi-Chao Zhao +1
Primordial non-Gaussianity encodes vital information of the physics of the early universe, particularly during the inflationary epoch. To explore the local-type primordial non-Gaus…
Bayesian Implications for the Primordial Black Holes from NANOGrav's Pulsar-Timing Data Using the Scalar-Induced Gravitational Waves
Zhi-Chao Zhao, Sai Wang
Assuming that the common-spectrum process in the NANOGrav 12.5-year dataset has an origin of scalar-induced gravitational waves, we study the enhancement of primordial curvature pe…
GW200105 and GW200115 are compatible with a scenario of primordial black hole binary coalescences
Sai Wang, Zhi-Chao Zhao
Two gravitational wave events, i.e. GW200105 and GW200115, were observed by the Advanced LIGO and Virgo detectors recently. In this work, we show that they can be explained by a sc…
Impacts of the simulated standard siren on estimating cosmological parameters
Dong Zhao, Zhi-Chao Zhao, Jun-Qing Xia
We propose a method based on the process of extracting gravitational wave (GW) parameters from GW signals to simulate the binary neutron-star (BNS) merging events. We simulate 1000…
Searching for a possible dipole anisotropy on acceleration scale with 147 rotationally supported galaxies
Zhe Chang, Hai-Nan Lin, Zhi-Chao Zhao +1
We report a possible dipole anisotropy on acceleration scale with 147 rotationally supported galaxies in local Universe. It is found that a monopole and dipole correction for…
Searching for a cosmological preferred direction with 147 rotationally supported galaxies
Yong Zhou, Zhi-Chao Zhao, Zhe Chang
It is well known that the Milgrom's MOND (modified Newtonian dynamics) explains well the mass discrepancy problem in galaxy rotation curves. The MOND predicts a universal accelerat…