Pith Number

pith:UHYHFE33

pith:2026:UHYHFE33HORFQR6ICFB542ONSL

not attested not anchored not stored refs pending

TDCOSMO XXV: A "soup-to-nuts" 6.5% $H_0$ measurement $-$ strong lensing and dynamics with a maximally flexible mass sheet

Anowar J. Shajib, Asadulla M. Shaymanov, Devon Williams, Fr\'ed\'eric Courbin, Fr\'ed\'eric Dux, Giacomo Queirolo, Ildar M. Asfandiyarov, Kenneth C. Wong, Martin Millon, Michele Cappellari, Otabek A. Burkhonov, Pritom Mozumdar, Shawn Knabel, Shuhrat A. Ehgamberdiev, Simon Birrer, Sof\'ia Rojas-Ruiz, Talat A. Akhunov, Tommaso Treu, William Sheu

A joint lensing and dynamics analysis of the quadruply imaged quasar SDSSJ1433+6007 yields H0 = 73.2 km s^{-1} Mpc^{-1} at 6.5% precision while treating the internal mass sheet as a free parameter.

arxiv:2604.14145 v2 · 2026-04-15 · astro-ph.CO · astro-ph.GA

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Claims

C1strongest claim

Accounting for maximal flexibility of the mass-sheet transformation, and assuming a flat ΛCDM cosmology and an Ω_m,0 prior from DESI data release 2, we infer H0 = 73.2^{+4.8}_{-4.7} km s^{-1} Mpc^{-1} (a 6.5% precision), and an internal mass-sheet parameter λ_int=1.12^{+0.05}_{-0.06}.

C2weakest assumption

That the combination of spatially resolved stellar kinematics, explicit modeling of oblateness/rotation/anisotropy, and DESI-based κ_ext fully breaks the mass-sheet degeneracy without residual bias in the joint lensing+dynamics fit.

C3one line summary

New 6.5% H0 = 73.2 km/s/Mpc measurement from strong lensing time delays and stellar dynamics in SDSSJ1433+6007, with fitted internal mass-sheet parameter λ_int = 1.12 away from unity at 2σ.

Receipt and verification

First computed	2026-05-25T02:01:20.416336Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a1f072937b3ba25847c81143de69cd92c1c31dfb9f807101a9d570851bdf2b23

Aliases

arxiv: 2604.14145 · arxiv_version: 2604.14145v2 · doi: 10.48550/arxiv.2604.14145 · pith_short_12: UHYHFE33HORF · pith_short_16: UHYHFE33HORFQR6I · pith_short_8: UHYHFE33

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/UHYHFE33HORFQR6ICFB542ONSL \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: a1f072937b3ba25847c81143de69cd92c1c31dfb9f807101a9d570851bdf2b23

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ff1815995ce91489992754cb1ec22e25c67218db78a765a66673a161e165c8c5",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2026-04-15T17:59:19Z",
    "title_canon_sha256": "652edc4ec0a8bed33aeaccb7652092c140eebbd0cea10b3d3bc2d84a796c1881"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.14145",
    "kind": "arxiv",
    "version": 2
  }
}