36 citations · 74 across the 9 of their papers we have counts for
10 papers
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…
Measuring the anisotropies in astrophysical and cosmological gravitational-wave backgrounds with Taiji and LISA networks
Zhi-Chao Zhao, Sai Wang
We investigate the capabilities of space-based gravitational-wave detector networks, specifically Taiji and LISA, to measure the anisotropies in stochastic gravitational-wave backg…
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…
Unveiling the Graviton Mass Bounds through Analysis of 2023 Pulsar Timing Array Data Releases
Sai Wang, Zhi-Chao Zhao
Strong evidence for the Helling-Downs correlation curves have been reported by multiple pulsar timing array (PTA) collaborations in middle 2023. In this work, we investigate the gr…