{
  "abstract": "We propose a new estimator of the electron--matter power spectrum, $P_{me}(k)$, which correlates the kinematic Sunyaev--Zel'dovich (kSZ) temperature with the product of the line-of-sight velocity field and the weak-lensing convergence. Like the stacked kSZ estimator, it factorizes into a calibratable velocity kernel times $P_{me}(k)$, but it probes the full matter distribution rather than the gas around a biased tracer. It therefore measures the baryonic suppression of the matter power spectrum, $S(k)$, one of the dominant astrophysical systematics for Stage-IV cosmic shear. We derive an analytic expression for the estimator, validate it against simulations at the per-cent level, and show that its parity structure cancels cosmic microwave background (CMB) foregrounds. We forecast the detectability with a realistic pipeline: velocities reconstructed from the simulated tracers, with and without photometric-redshift errors; the kSZ signal of all the ionized gas along the line of sight; a CMB map with Simons Observatory (SO) noise; and LSST source samples free of intrinsic alignments. A DESI-like spectroscopic sample at $0.5<z<1$ over the $20\\%$ of the sky that DESI, LSST and SO share gives a $4$--$7σ$ detection. Photometric redshifts cost only $5$--$10\\%$ of the significance, so LSST can supply its own velocity tracers over its full overlap with SO: with tracers at $0.1<z<1.3$ and five source samples we find $10σ$ in an end-to-end simulation, and $13σ$ with Advanced SO (16$σ$ if extending to $z < 1.5$). This corresponds to a few-per-cent measurement of $S(k)$ at $k\\simeq1$--$4\\,h\\,{\\rm Mpc}^{-1}$, the scales that matter most for cosmic shear.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.27149",
  "author_total": 1,
  "authors": [
    {
      "name": "Boryana Hadzhiyska"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9919fqdxc0zbf.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.27149",
  "fulltext_url": null,
  "id": "9919fqdxc0zbf",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.27149",
  "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"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7171775178",
  "pdf_url": "https://arxiv.org/pdf/2607.27149",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9919fqdxc0zbf.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:11Z",
      "native_id": "2607.27149",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.27149"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Shear-kSZ: A New Estimator for the Matter-Electron Power Spectrum from kSZ Tomography and Weak Lensing",
  "title_text": "Shear-kSZ: A New Estimator for the Matter-Electron Power Spectrum from kSZ Tomography and Weak Lensing",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:11Z",
  "url": "https://research.draconitic.com/paper/9919fqdxc0zbf",
  "venue": "arXiv",
  "versions": []
}