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Probing Scalar Polarization with Next-Generation Gravitational-Wave Detectors: The Roles of Detector Geometry and Source Inclination — arXiv:2610.38956

Source: arXiv (en)
Original: https://arxiv.org/abs/2610.38956
License (as archived): CC0-1.0
Archived: 2026-11-01T02:55:17.160Z
SHA-256 of the archived text: 15ffe3edb3d88d6ceb6ecc9383b140b45aaa2587db32089586ff0d9686bea25f
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How to cite

Probing Scalar Polarization with Next-Generation Gravitational-Wave Detectors: The Roles of Detector Geometry and Source Inclination — arXiv:2610.38956 — arXiv (en), https://arxiv.org/abs/2610.38956 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_7139dd4fb59d (Metraipolis archive dc_7139dd4fb59d, sha256 15ffe3edb3d88d6ceb6ecc9383b140b45aaa2587db32089586ff0d9686bea25f)

BibTeX

@misc{dc7139dd4fb59d,
  title = {Probing Scalar Polarization with Next-Generation Gravitational-Wave Detectors: The Roles of Detector Geometry and Source Inclination — arXiv:2610.38956},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2610.38956},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_7139dd4fb59d; sha256 15ffe3edb3d88d6ceb6ecc9383b140b45aaa2587db32089586ff0d9686bea25f},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2610.38956. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Gravitational-wave observations of compact binaries offer a direct way to test whether gravity admits polarizations beyond the two tensor modes of general relativity. We perform a forecast to assess how well future multi-messenger events will constrain the presence of scalar polarizations in gravitational waves. Performing binary neutron star injections, we forecast next-generation constraints on three modified gravity parameters in the PPE formalism: $\alpha$ (tensor amplitude), $\alpha_B$ (scalar amplitude) and $\beta$ (tensor and scalar phase). Cosmic Explorer (CE) and Einstein Telescope (ET) each tighten every parameter by 1--2 orders of magnitude over an O5 LIGO-Virgo network, with ET's triangular geometry giving a persistent $\approx2\times$ improvement over 2$\times$CE on the scalar-mode amplitude $\alpha_B$ in both a GW170817-like and a second, representative BNS. We show that, if the sky position and luminosity distance are known from EM observations, adding an EM-based prior on the orbital inclination $\iota$ narrows the $\alpha_B$ constraint by $\approx56\times$ relative to an isotropic inclination prior, for a GW170817-like event. We also assess how EM inclination priors as well as assumptions on the neutron star equation of state may affect the inference on the scalar amplitude $\alpha_B$. Overall, these results indicate that detector geometry and the availability of well-placed EM external information are both important levers --- alongside raw network sensitivity --- for next decade scalar-polarization tests.

Tema degli esploratori: fisica e astronomia (elenco arXiv astro-ph.IM, nuovi lavori del giorno).
Categorie arXiv: General Relativity and Quantum Cosmology (gr-qc) ; High Energy Astrophysical Phenomena (astro-ph.HE); Instrumentation and Methods for Astrophysics (astro-ph.IM).
Pagina del lavoro: https://arxiv.org/abs/2610.38956 — 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 2026-11-01T02:22:13.273Z dalla pagina https://arxiv.org/list/astro-ph.IM/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).