{
  "id": "2312.02486",
  "version": "v1",
  "published": "2023-12-05T04:24:35.000Z",
  "updated": "2023-12-05T04:24:35.000Z",
  "title": "Probing the vector charge of Sagittarius A* with pulsar timing",
  "authors": [
    "Zexin Hu",
    "Lijing Shao",
    "Rui Xu",
    "Dicong Liang",
    "Zhan-Feng Mai"
  ],
  "comment": "18 pages, 6 figures",
  "categories": [
    "astro-ph.HE",
    "gr-qc"
  ],
  "abstract": "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).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-12-05T04:24:35.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "sagittarius",
      "laser interferometer space antenna",
      "bumblebee gravity model",
      "vector charge-to-mass ratio",
      "event horizon telescope"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}