Pith Number

pith:FM6FACKD

pith:2024:FM6FACKDTAVFGLJ6GSDQB7CGRG

not attested not anchored not stored refs pending

Incompatibility of fine-structure constant variations at recombination with local observations

L\'eo Vacher, Nils Sch\"oneberg

arxiv:2403.02256 v2 · 2024-03-04 · astro-ph.CO · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FM6FACKDTAVFGLJ6GSDQB7CGRG}

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	2026-07-05T08:21:14.052106Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2b3c500943982a532d3e348700fc4689baabd118545bc3c0a90ceb364cadf2ca

Aliases

arxiv: 2403.02256 · arxiv_version: 2403.02256v2 · doi: 10.48550/arxiv.2403.02256 · pith_short_12: FM6FACKDTAVF · pith_short_16: FM6FACKDTAVFGLJ6 · pith_short_8: FM6FACKD

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/FM6FACKDTAVFGLJ6GSDQB7CGRG \
  | 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: 2b3c500943982a532d3e348700fc4689baabd118545bc3c0a90ceb364cadf2ca

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c3dbb1c3cd6bc1c665767087e3c3a6edeca8eb21796129e8c97e2aea4c5a075d",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2024-03-04T17:42:17Z",
    "title_canon_sha256": "47f1c4b2aef23d4c523f89b7afd691d3b801c0a3f98ae6dec36c352a00403848"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2403.02256",
    "kind": "arxiv",
    "version": 2
  }
}