Pith Number

pith:DN6A34KN

pith:2008:DN6A34KNTUQGDIGEJKNL26RAA5

not attested not anchored not stored refs pending

HeII->HeI Recombination of Primordial Helium Plasma Including the Effect of Neutral Hydrogen

A. V. Ivanchik, D. A. Varshalovich, E. E. Kholupenko

arxiv:0812.3067 v1 · 2008-12-16 · astro-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{DN6A34KNTUQGDIGEJKNL26RAA5}

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	2026-05-18T04:14:36.247086Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1b7c0df14d9d2061a0c44a9abd7a20075c2077e9c2772509c0dae7fdebeca884

Aliases

arxiv: 0812.3067 · arxiv_version: 0812.3067v1 · doi: 10.48550/arxiv.0812.3067 · pith_short_12: DN6A34KNTUQG · pith_short_16: DN6A34KNTUQGDIGE · pith_short_8: DN6A34KN

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/DN6A34KNTUQGDIGEJKNL26RAA5 \
  | 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: 1b7c0df14d9d2061a0c44a9abd7a20075c2077e9c2772509c0dae7fdebeca884

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9c360402c5b02597e072f86a74093ade0dd5acf895845dc122bd1be5497a7be7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-12-16T14:57:32Z",
    "title_canon_sha256": "d5e11922dff538929c62079d4b2a4d9b774c0986d8bd75811d73875596d702e9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0812.3067",
    "kind": "arxiv",
    "version": 1
  }
}