From the 1 of 8 linked papers with an AI index.
8 papers
Probing Graviton Mass with MeerKAT PTA and SKA--PTA Forecasts
Zhi-Chao Zhao, Sai Wang
The paper uses data from the MeerKAT pulsar timing array to set upper limits on the graviton mass and forecasts that the upcoming SKA pulsar timing array could improve these limits…
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…
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…
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…
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…