Probing the vector charge of Sagittarius A* with pulsar timing
| Autor: | Hu, Zexin, Shao, Lijing, Xu, Rui, Liang, Dicong, Mai, Zhan-Feng |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | JCAP 04 (2024) 087 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1475-7516/2024/04/087 |
| Popis: | Timing a pulsar orbiting around Sagittarius A* (Sgr A*) can provide us with a unique opportunity of testing gravity theories. We investigate the detectability of a vector charge carried by the Sgr A* black hole (BH) in the bumblebee gravity model with simulated future pulsar timing observations. The spacetime of a bumblebee BH introduces characteristic changes to the orbital dynamics of the pulsar and the light propagation of radio signals. Assuming a timing precision of 1 ms, our simulation shows that a 5-yr observation of a pulsar with an orbital period $P_b\sim 0.5\,{\rm yr}$ and an orbital eccentricity $e\sim 0.8$ can probe a vector charge-to-mass ratio as small as $Q/M\sim 10^{-3}$, which is much more stringent than the current constraint from the Event Horizon Telescope (EHT) observations, and comparable to the prospective constraint from extreme mass-ratio inspirals with the Laser Interferometer Space Antenna (LISA). Comment: 18 pages, 6 figures |
| Databáze: | arXiv |
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