Pith Number

pith:A27BL3UR

pith:2010:A27BL3URTP3GBCYM26VQCQICU5

not attested not anchored not stored refs pending

Keck telescope constraint on cosmological variation of the proton-to-electron mass ratio

(2) VU Univ., (3) Univ. Victoria, (4) UCO/Lick Obs. Univ. Calfornia Santa Cruz, 5), (5) Univ. Amsterdam, (6) Yale Univ., (7) IoA, Adrian L. Malec (1), Australia, Canada, Jason Tumlinson (6), J. Xavier Prochaska (4), Lex Kaper (2, Michael T. Murphy (1), Nikola Milutinovic (3), Robert F. Carswell (7), Ruth Buning (2), S. L. Ellison (3), The Netherlands, UK), Univ. Cambridge, USA, Wim Ubachs (2) ((1) Swinburne Univ.

arxiv:1001.4078 v1 · 2010-01-22 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{A27BL3URTP3GBCYM26VQCQICU5}

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	2026-05-18T02:09:30.936590Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

06be15ee919bf6608b0cd7ab014102a76540fd8429f9665aa09d11656ee574d0

Aliases

arxiv: 1001.4078 · arxiv_version: 1001.4078v1 · doi: 10.48550/arxiv.1001.4078 · pith_short_12: A27BL3URTP3G · pith_short_16: A27BL3URTP3GBCYM · pith_short_8: A27BL3UR

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/A27BL3URTP3GBCYM26VQCQICU5 \
  | 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: 06be15ee919bf6608b0cd7ab014102a76540fd8429f9665aa09d11656ee574d0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "142019e1d71c986159f98198d97a4c9663abfd5c882ca846c70675a26d758288",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2010-01-22T21:10:36Z",
    "title_canon_sha256": "57f5da5e1df591856ee71eda5f10172c2668e40497eca447dd7bcdd7320e4b69"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1001.4078",
    "kind": "arxiv",
    "version": 1
  }
}