Pith Number

pith:CXOPCB4J

pith:1998:CXOPCB4J4BKXAOCXDEAFENWCQ6

not attested not anchored not stored refs pending

Possible Constraints on the Time Variation of the Fine Structure Constant from Cosmic Microwave Background Data

Steen Hannestad

arxiv:astro-ph/9810102 v2 · 1998-10-07 · astro-ph · hep-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CXOPCB4J4BKXAOCXDEAFENWCQ6}

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	2026-07-04T16:07:05.221204Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

15dcf10789e05570385719005236c287855d985ff36960a41665272d0fcce562

Aliases

arxiv: astro-ph/9810102 · arxiv_version: astro-ph/9810102v2 · doi: 10.48550/arxiv.astro-ph/9810102 · pith_short_12: CXOPCB4J4BKX · pith_short_16: CXOPCB4J4BKXAOCX · pith_short_8: CXOPCB4J

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/CXOPCB4J4BKXAOCXDEAFENWCQ6 \
  | 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: 15dcf10789e05570385719005236c287855d985ff36960a41665272d0fcce562

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "047cdc72f9314c382ef67d6ce427c954159e2294cde1c4203f44951ef4956222",
    "cross_cats_sorted": [
      "hep-ph"
    ],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-10-07T09:45:33Z",
    "title_canon_sha256": "254ed13e5433129fd9ada1deeb53caf91a4c6e2f7f1b3143520cab6b03b5e1fc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9810102",
    "kind": "arxiv",
    "version": 2
  }
}