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Testing space-time geometries and theories of gravity at the Galactic Center with pulsar's time delay

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arxiv 2305.18178 v2 pith:DXFWN4AL submitted 2023-05-29 gr-qc astro-ph.GAastro-ph.HE

Riccardo Della Monica , Ivan de Martino , Mariafelicia de Laurentis This is my paper · ORCID
classification gr-qcastro-ph.GAastro-ph.HE
keywords centergalacticgravityspace-timeblackholelikemethodology
verification ladder T0 review T1 audit T2 compute T3 formal
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We developed a numerical methodology to compute the fully-relativistic propagation time of photons emitted by a pulsar in orbit around a massive compact object, like the supermassive black hole Sagittarius A* in the Galactic Center, whose gravitational field is described by a generic spherically symmetric space-time. Pulsars at the Galactic Center are usually regarded as the next major precision probe for theories of gravity, filling the current experimental gap between horizon-scale gravity tests and those at larger scales. We retain a completely general approach, which allows us to apply our code to the Schwarzschild space-time (by which we successfully validate our methodology) and to three different well-motivated alternatives to the standard black hole paradigm. The results of our calculations highlight departures spanning several orders of magnitudes in timing residuals, that are supposed to be detectable with future observing facilities like the Square Kilometer Array.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 13 citations worldwide. Full citation record

  1. Probing nonlinear electrodynamics-sourced black holes via light and orbital mechanics

    gr-qc 2026-08 conditional novelty 6.0 of 10

    For ModMax black holes, Shapiro time delay and gravitational redshift are identical for both photon polarizations, while Sagnac and kinematic shifts distinguish them; S2 precession bounds e^-gamma (Q/2M)^2 <= 0.135.

  2. Probing an Intermediate-Mass Black Hole Companion of Sagittarius A* with Pulsar Timing

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    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.

  3. Pulsar timing in the Galactic Center

    gr-qc 2025-01 conditional novelty 6.0 of 10

    A fully relativistic (geodesic) pulsar timing model for the Galactic Center shows that 1PN-based timing formulas produce errors of up to seconds for tight orbits around Sgr A*.

  4. Galactic Centre Pulsars with the SKAO

    astro-ph.HE 2026-07 accept novelty 4.0 of 10

    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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