Prospects for constraining the Yukawa gravity with pulsars around Sagittarius A*. Issue 11 (1st November 2022)

• Record Type: Journal Article
• Authors: Dong, Yiming; Shao, Lijing; Hu, Zexin; Miao, Xueli; Wang, Ziming
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2022:Issue 11(2022)
• Publication Date: 2022-11-01
• Subjects: radio pulsars -- astrophysical black holes -- GR black holes -- modified gravity; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2022/11/051
• Languages: English
• ISSNs: 1475-7516

Abstract

Abstract: The discovery of radio pulsars (PSRs) around the supermassive black hole (SMBH) in our Galactic Center (GC), Sagittarius A* (Sgr A*), will have significant implications for tests of gravity. In this paper, we predict restrictions on the parameters of the Yukawa gravity by timing a pulsar around Sgr A* with a variety of orbital parameters. Based on a realistic timing accuracy of the times of arrival (TOAs), σ TOA = 100 μ s, and using a number of 960 TOAs in a 20-yr observation, our numerical simulations show that the PSR-SMBH system will improve current tests of the Yukawa gravity when the range of the Yukawa interaction varies between 10 1 –10 4 AU, and it can limit the graviton mass to be mg ≲ 10 -24 eV/ c 2 .