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Testing General Relativity with Binary Lens Microlensing Events — arXiv:2610.11949

Source: arXiv (en)
Original: https://arxiv.org/abs/2610.11949
License (as archived): CC0-1.0
Archived: 2026-10-09T06:40:00.424Z
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Testing General Relativity with Binary Lens Microlensing Events — arXiv:2610.11949 — arXiv (en), https://arxiv.org/abs/2610.11949 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_00a6a30d1071 (Metraipolis archive dc_00a6a30d1071, sha256 743ecde9ee1397d3f3596a7abd9e0622a25cd4a03517087ce0406a3ee40af6d8)

BibTeX

@misc{dc00a6a30d1071,
  title = {Testing General Relativity with Binary Lens Microlensing Events — arXiv:2610.11949},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2610.11949},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_00a6a30d1071; sha256 743ecde9ee1397d3f3596a7abd9e0622a25cd4a03517087ce0406a3ee40af6d8},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2610.11949. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Einstein's General Relativity (GR), which has been precisely tested on galaxy and solar system scales, is still poorly constrained in extremely weak gravitational fields (with dimensionless Newtonian potentials of $\Phi \sim 10^{-8}$). In this Letter, we propose a new method to probe such a weak-field regime of gravity and measure the spatial curvature generated per unit mass. Specifically, binary microlensing events provide a laboratory to measure the parameterized post-Newtonian (PPN) parameter ($\gamma$), by combining the lensing mass ($M_{\rm lens}^{\rm GR}$) inferred from microlensing with the dynamical mass ($M_{\rm dyn}$) determined from interferometric astrometry. Astrometric tracking of binary lenses was previously hindered by their faintness and minuscule angular separations (typically a few milliarcseconds). This limitation has been alleviated by the deployment of GRAVITY+, which pushes the instrument's sensitivity and astrometric precision to unprecedented heights. Based on astrometric simulations of the binary microlensing event ASASSN-22av, we directly estimate $\gamma$ at the precision of ~23%. Such test of GR in the extremely weak-field regime can be further improved to much higher precision (~3%), based on more binary microlensing events with precise determination of the dynamical/lens mass.

Tema degli esploratori: fisica e astronomia (elenco arXiv astro-ph.IM, nuovi lavori del giorno).
Categorie arXiv: General Relativity and Quantum Cosmology (gr-qc) ; Instrumentation and Methods for Astrophysics (astro-ph.IM).
Pagina del lavoro: https://arxiv.org/abs/2610.11949 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-09T06:01:40.192Z dalla pagina https://arxiv.org/list/astro-ph.IM/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).