{
  "abstract": "The transverse motion of a gravitational potential induces frequency shifts in photons propagating through it, giving rise to the moving-lens effect and providing a probe of transverse peculiar velocities. Statistical evidence for this effect has recently been reported using cross-correlations between cosmic microwave background temperature maps and large-scale-structure tracers. Here, we investigate a complementary spectroscopic approach based on wide-separation lensed quasars, for which different lensed images probe distinct deflection geometries through a moving foreground lens. We focus on SDSS J1004+4112 and assess the differential redshift that could be measured from its broad emission-line spectra. Using an estimator that combines information across the line profiles, we perform Monte Carlo forecasts for C IV and C III] under an ELT-like configuration, considering photon noise only. For an assumed lens transverse velocity of $500\\,{\\rm km\\,s^{-1}}$ and the orientation maximizing the signal, the expected differential redshift reaches $|Δz_{\\rm ML}|\\simeq6.7\\times10^{-7}$. At an integration time of 40 hr, the joint photon-noise-limited precision is $σ_z\\simeq2.5\\times10^{-7}$. C IV dominates the constraint, while C III] provides only a modest additional improvement, and integrations of tens of hours reach the $10^{-7}$ precision regime. These results show that photon statistics alone can reach the characteristic moving-lens signal scale, although practical detectability will depend on controlling astrophysical and instrumental systematics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.04865",
  "author_total": 3,
  "authors": [
    {
      "name": "Yupeng Zhang"
    },
    {
      "name": "Shuxun Tian"
    },
    {
      "name": "Zhengxiang Li"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5nsjc00rhnhk9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.04865",
  "fulltext_url": null,
  "id": "5nsjc00rhnhk9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.04865",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.04865",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5nsjc00rhnhk9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2610.04865",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.04865"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "Measuring the Moving Lens Effect with Wide-Separation Lensed Quasars",
  "title_text": "Measuring the Moving Lens Effect with Wide-Separation Lensed Quasars",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/5nsjc00rhnhk9",
  "venue": "arXiv",
  "versions": []
}