{
  "abstract": "A bstract The strongly-coupled 3-dimensional theory, holographically dual to black branes at fixed chemical potential μ and temperature T ≪ μ is considered in AdS 4 Einstein-Maxwell theory. The retarded Green’s functions at frequency ω is calculated using holography in the regime ω , T ≪ μ but otherwise arbitrary. When the transverse space has finite volume, there is a non-zero energy scale E gap , scaling as 1/ μ for large μ , below which quantum-gravitational corrections due to the fluctuations of the nearly-gapless Schwarzian modes become important. Such corrections to the retarded Green’s function are calculated at different relative values of ω , T , and E gap . The ω → 0 limit is used to define the shear viscosity η . As the temperature is lowered below μ , quantum corrections are found to increase the value of η with respect to its semiclassical value. The quantum-corrected result for η diverges as $$ \\sqrt{{\\mathrm{E}}_{\\mathrm{gap}}/T} $$ E gap / T at T ≪ E gap , in accord with corresponding results for the absorption cross section. The quantum result for the ratio η / s , where s is the entropy density, dips below the semiclassical limit of 1/4 π when E gap ≪ T ≪ μ , then turns back to increase towards lower temperatures, and finally diverges at temperatures much below E gap .",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "name": "Alexandros Kanargias"
    },
    {
      "name": "Elias Kiritsis"
    },
    {
      "name": "Sameer Murthy"
    },
    {
      "name": "Olga Papadoulaki"
    },
    {
      "name": "Achilleas Porfyriadis"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/75534r3pd7w1q.bib",
  "cited_by": 1,
  "doi": "10.1007/jhep07(2026)149",
  "fulltext_url": null,
  "id": "75534r3pd7w1q",
  "issns": [
    "1126-6708",
    "1029-8479"
  ],
  "landing_url": "https://hal.science/hal-05771503v1",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7169580900",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP07(2026)149.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-16",
  "publisher": "Springer",
  "ris": "https://research.draconitic.com/paper/75534r3pd7w1q.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:44Z",
      "native_id": "hal-05771503",
      "source": "hal",
      "url": "https://hal.science/hal-05771503v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Black Holes and Theoretical Physics",
      "subfield": "high-energy"
    }
  ],
  "title": "Holographic shear correlators at low temperatures, and quantum η/s",
  "title_text": "Holographic shear correlators at low temperatures, and quantum η/s",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:44Z",
  "url": "https://research.draconitic.com/paper/75534r3pd7w1q",
  "venue": "Journal of High Energy Physics",
  "versions": []
}