Pith Number

pith:FUUFCAZT

pith:2001:FUUFCAZTNFSAIGGEVBJR4BDANC

not attested not anchored not stored refs pending

Early-universe constraints on a time-varying fine structure constant

A. Melchiorri, C.J.A.P. Martins, G. Mangano, G. Miele, G. Rocha, O. Pisanti, P.P. Avelino, P.T.P. Viana, S. Esposito

arxiv:astro-ph/0102144 v4 · 2001-02-08 · astro-ph · hep-ph · hep-th

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FUUFCAZTNFSAIGGEVBJR4BDANC}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-04T15:26:19.579082Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2d2851033369640418c4a8531e04606897cbf690daa0f32b52e3a888fba6f898

Aliases

arxiv: astro-ph/0102144 · arxiv_version: astro-ph/0102144v4 · doi: 10.48550/arxiv.astro-ph/0102144 · pith_short_12: FUUFCAZTNFSA · pith_short_16: FUUFCAZTNFSAIGGE · pith_short_8: FUUFCAZT

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/FUUFCAZTNFSAIGGEVBJR4BDANC \
  | 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: 2d2851033369640418c4a8531e04606897cbf690daa0f32b52e3a888fba6f898

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bee1bb37e5dbbb64e7ca7449140a621b2868943e064d1e2805028fe0ebd338a2",
    "cross_cats_sorted": [
      "hep-ph",
      "hep-th"
    ],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2001-02-08T18:49:49Z",
    "title_canon_sha256": "bc7a9106facac2e7b95a54067afbaf69c24632e97fca34a543ca0b243ca886f2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0102144",
    "kind": "arxiv",
    "version": 4
  }
}