2025/08/13 by Shao, Lijing, Hu, Zexin · 1 citation
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2508.09931
Searching for radio pulsars orbiting around the Galactic centre black hole (BH), Sagittarius A^⋆ (Sgr A^⋆), represents a holy grail goal for large-area radio telescopes, in particular for the Square Kilometre Array. Follow-up timing observation of such a PSR-Sgr A^⋆ binary system with an orbital period \lesssim O(1 \rm year) will bring forward a handful of new tests on different aspects of fundamental physics that are barely accessible with other means. However, mass perturbation in the Galactic centre harms the gravitational cleanness of PSR-Sgr A^⋆ systems. In order to flexibly account for perturbations, a numerical pulsar timing model is gradually being built, which can be used to probe the spacetime around Sgr A^⋆ BH and study the nature of dark matter.