5 papers · 1 filter
Correspondence between multileaf topology of closed geodesics and spatiotemporal autocorrelations of hotspot images in Schwarzschild spacetime
Fengting Xie, Qing-Hua Zhu, Xin Li
The classification of relativistic closed orbits by their multileaf structures provides a framework for studying strong-field dynamics. Identifying these structures in astronomical…
Exploring the statistical anisotropy of primordial curvature perturbations with pulsar timing arrays
Fengting Xie, Zhi-Chao Zhao, Qing-Hua Zhu +1
The recent detection of a stochastic gravitational wave background by pulsar timing arrays has opened a new window in understanding supermassive black hole binaries and in probing…
Finite velocity effect of ultralight vector dark matter in pulsar timing arrays
Qing-Hua Zhu
Pulsar timing array (PTA) collaborations have recently reported evidence of the stochastic gravitational waves. In addition to gravitational wave signals from cosmological or astro…
Ultralight scalar dark matter versus nonadiabatic perfect fluid dark matter in pulsar timing
Qing-Hua Zhu
Recent evidence for stochastic gravitational waves reported by pulsar timing array (PTA) collaborations might open a new window for studying cosmology and astrophysical phenomena.…
Flattened bispectrum of the scalar-induced gravitational waves
Qing-Hua Zhu
Recent pulsar timing array collaborations have reported evidence of the stochastic gravitational wave background. The gravitational waves induced by primordial curvature perturbati…