Pith Number

pith:67MDUXCH

pith:2002:67MDUXCH35N6PZMLMF6FCN634R

not attested not anchored not stored refs pending

On the cosmological variation of the fine structure constant

Antonio F. Ra\~nada

arxiv:astro-ph/0202224 v4 · 2002-02-12 · astro-ph · gr-qc · 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{67MDUXCH35N6PZMLMF6FCN634R}

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	2026-05-18T04:33:05.678016Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f7d83a5c47df5be7e58b617c5137dbe471ff4cd7f6503fb08ebe37bef54a5685

Aliases

arxiv: astro-ph/0202224 · arxiv_version: astro-ph/0202224v4 · doi: 10.48550/arxiv.astro-ph/0202224 · pith_short_12: 67MDUXCH35N6 · pith_short_16: 67MDUXCH35N6PZML · pith_short_8: 67MDUXCH

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/67MDUXCH35N6PZMLMF6FCN634R \
  | 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: f7d83a5c47df5be7e58b617c5137dbe471ff4cd7f6503fb08ebe37bef54a5685

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fdf069784ca77e67d2a8aa907dbd9bf8263d1eb3bbd9705be581b53a2ff7f918",
    "cross_cats_sorted": [
      "gr-qc",
      "hep-th"
    ],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2002-02-12T15:05:15Z",
    "title_canon_sha256": "c2372206c8996a44d8a8a25c937bfe22e1c4dc4901e13f4ef2db4cdf1780463c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0202224",
    "kind": "arxiv",
    "version": 4
  }
}