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Probing departures from Schwarzschild geometry with the S301 star and kilometre-baseline interferometry

  • Rodrigo P Silva
  • Alexandre C.M Correia
  • Paulo J.V Garcia
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Abstract

The S301 star reaches a pericentre one tenth that of S2, opening a new regime for probing black-hole spin and departures from Schwarzschild. We develop a post-Newtonian secular Hamiltonian framework for bound geodesics in stationary, axisymmetric spacetimes and compute the maximum projected astrometric deviation over one orbit. At the expected GRAVITY+ precision, S301 can probe several nonrotating geometries and sizeable spin-induced deviations, while kilometre-baseline interferometry can probe much smaller departures, establishing S301 as a powerful test of the spacetime geometry of Sgr A*.

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Cite

BibTeXRIS
BibTeX
@misc{silva2026probing,
  title = {{Probing departures from Schwarzschild geometry with the S301 star and kilometre-baseline interferometry}},
  author = {Rodrigo P Silva and Alexandre C.M Correia and Paulo J.V Garcia},
  howpublished = {HAL},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.07123},
  eprint = {2610.07123},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05842231v1},
}
RIS
TY  - UNPB
TI  - Probing departures from Schwarzschild geometry with the S301 star and kilometre-baseline interferometry
AU  - Rodrigo P Silva
AU  - Alexandre C.M Correia
AU  - Paulo J.V Garcia
PY  - 2026
DA  - 2026/10/05
PB  - HAL
DO  - 10.48550/arxiv.2610.07123
UR  - https://hal.science/hal-05842231v1
AB  - The S301 star reaches a pericentre one tenth that of S2, opening a new regime for probing black-hole spin and departures from Schwarzschild. We develop a post-Newtonian secular Hamiltonian framework for bound geodesics in stationary, axisymmetric spacetimes and compute the maximum projected astrometric deviation over one orbit. At the expected GRAVITY+ precision, S301 can probe several nonrotating geometries and sizeable spin-induced deviations, while kilometre-baseline interferometry can probe much smaller departures, establishing S301 as a powerful test of the spacetime geometry of Sgr A*.
ER  -