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Probing the vector charge of Sagittarius A* with pulsar timing
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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).
Forward citations
Cited by 3 Pith papers
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Black holes and neutron stars in massive Hellings-Nordtvedt theory
In massive Hellings-Nordtvedt theory, a nonzero vector vacuum asymptotically forbids both curvature-vector couplings at once, and the A²R sector yields Schwarzschild-like black holes plus neutron stars that can deviat...
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Probing an Intermediate-Mass Black Hole Companion of Sagittarius A* with Pulsar Timing
A 1PN numerical timing model shows that a pulsar orbiting Sgr A* produces large, distinctive post-fit residuals from an IMBH companion, enabling constraints that fill gaps left by existing S-star and proper-motion bounds.
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Galactic Centre Pulsars with the SKAO
Updated SKA-MID sensitivity and multi-beam search strategies can detect up to ~84% of Galactic Centre pulsars (and ~60% of MSPs) under magnetar-like scattering, unlocking precision tests around Sgr A*.
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