75 citations · 390 across the 26 of their papers we have counts for
35 papers
Optimal all-angle reconstruction of the Hellings-Downs curve
Jing-Hong Han, Zhi-Chao Zhao
Pulsar timing arrays (PTAs) detect nanohertz gravitational waves through spatial correlations between the timing residuals of different pulsars. For an isotropic, unpolarized stoch…
Probing Graviton Mass with MeerKAT PTA and SKA--PTA Forecasts
Zhi-Chao Zhao, Sai Wang
We present 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 Kilometre Arra…
Solving Hamiltonian Constraint Equation with Physics-Informed Neural Networks
Yu-Chen Zhou, Hao Ma, Zhoujian Cao +6
Numerical relativity (NR), solving Einstein equation numerically, plays an important role in source modelling for gravitational wave astronomy. Traditional methods for NR including…
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…
Forecasting graviton-mass constraints from the full covariance of PTA-astrometry ORF estimators
Jing-Hong Han, Zhi-Chao Zhao
We develop a full-covariance formalism for pulsar timing array(PTA) -- astrometry verlap reduction function (ORF) estimators and use it to forecast graviton-mass constraints from a…
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…