Pith Number

pith:N2J2A2KX

pith:2004:N2J2A2KXB2YFLII6XJU375B27M

not attested not anchored not stored refs pending

Cosmological Variation of the Fine Structure Constant versus a new Interaction

E.J. Angstmann, S.G. Karshenboim, V.V. Flambaum

arxiv:physics/0403009 v2 · 2004-03-01 · physics.atom-ph · astro-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{N2J2A2KXB2YFLII6XJU375B27M}

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	2026-05-18T03:24:20.992481Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6e93a069570eb055a11eba69bff43afb1e179ffd42deb3ad27303bd8399ab2e2

Aliases

arxiv: physics/0403009 · arxiv_version: physics/0403009v2 · doi: 10.48550/arxiv.physics/0403009 · pith_short_12: N2J2A2KXB2YF · pith_short_16: N2J2A2KXB2YFLII6 · pith_short_8: N2J2A2KX

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/N2J2A2KXB2YFLII6XJU375B27M \
  | 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: 6e93a069570eb055a11eba69bff43afb1e179ffd42deb3ad27303bd8399ab2e2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "43f6e25c7cbf921389e9169b5384641ce66a00602a52d4e1301249249cf5c67d",
    "cross_cats_sorted": [
      "astro-ph",
      "hep-th"
    ],
    "license": "",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2004-03-01T07:02:16Z",
    "title_canon_sha256": "bdd5befcf8cc346f37f4bf8c7caa2fe91a325ff4873f84388f9b464bac3b1145"
  },
  "schema_version": "1.0",
  "source": {
    "id": "physics/0403009",
    "kind": "arxiv",
    "version": 2
  }
}