Pith Number

pith:4PGVJFVJ

pith:2013:4PGVJFVJ2GYM43UQOS5YF77ZFG

not attested not anchored not stored refs pending

Robust Constraint on a Drifting Proton-to-Electron Mass Ratio at z=0.89 from Methanol Observation at Three Radio Telescopes

4), Christian Henkel (3, Germany (4) King Abdulaziz University, Hendrick L. Bethlem (1), Julija Bagdonaite (1), Karl M. Menten (3) ((1) VU University Amsterdam, Mario Dapr\`a (1), Netherlands (2) Onsala Space Observatory, Paul Jansen (1), Saudi Arabia), S\'ebastien Muller (2), Sweden (3) Max-Planck-Institut f\"ur Radioastonomie, Wim Ubachs (1)

arxiv:1311.3438 v2 · 2013-11-14 · astro-ph.CO · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4PGVJFVJ2GYM43UQOS5YF77ZFG}

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	2026-05-18T03:05:09.518913Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e3cd5496a9d1b0ce6e9074bb82fff9298ba4a1d1effabea80d8197878bbbcb29

Aliases

arxiv: 1311.3438 · arxiv_version: 1311.3438v2 · doi: 10.48550/arxiv.1311.3438 · pith_short_12: 4PGVJFVJ2GYM · pith_short_16: 4PGVJFVJ2GYM43UQ · pith_short_8: 4PGVJFVJ

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/4PGVJFVJ2GYM43UQOS5YF77ZFG \
  | 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: e3cd5496a9d1b0ce6e9074bb82fff9298ba4a1d1effabea80d8197878bbbcb29

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f1f6e98e0b9b0cae49b702ce594a6a794788e060dddc4c566d87c7dc11a8a468",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2013-11-14T10:19:07Z",
    "title_canon_sha256": "b2b3c0d417982df3c316d694c170baaace754dae95b93b49e2ac6d5735557d6e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1311.3438",
    "kind": "arxiv",
    "version": 2
  }
}