{
  "abstract": "A cosmological constant $Λ$ in a universe weakly violating the cosmological principle (CP) can mimic a dynamical dark energy (DDE) in a FRW universe, and therefore challenging the recently reported DDE evidences. We test this scenario in the form of $Λ$LTB cosmology, against two data combinations. (1) DESI DR2 BAO, Planck CMB, together with any of the four SNe Ia compilations (UNION3, Pantheon+, DES SN5YR, and DES Dovekie) show no preference over DDE or $Λ$LTB. (2) The inclusion of the kinematic Sunyaev Zel'dovich (kSZ) effect rules out a large portion of the CP violation parameter space allowed by (1). However, the existence of a $\\sim 300$ Mpc$/h$ region with $\\sim 10\\%$ matter density excess is still allowed by the current data, and therefore remains a viable alternative to DDE. To facilitate further tests, we present analytical expressions of the distance-redshift relation and the kSZ effect in a universe with weak CP violation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.05729",
  "author_total": 2,
  "authors": [
    {
      "name": "Yukang Zhang"
    },
    {
      "name": "Pengjie Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/43cvwsxtmppfb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.05729",
  "fulltext_url": null,
  "id": "43cvwsxtmppfb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.05729",
  "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",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7220704828",
  "pdf_url": "https://arxiv.org/pdf/2610.05729",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/43cvwsxtmppfb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2610.05729",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.05729"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "Testing $Λ$LTB as an alternative to dynamical dark energy",
  "title_text": "Testing ΛLTB as an alternative to dynamical dark energy",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/43cvwsxtmppfb",
  "venue": "arXiv",
  "versions": []
}