Pith Number

pith:SMKQVPI6

pith:2009:SMKQVPI6XYY54TWIGVB3WD3YN2

not attested not anchored not stored refs pending

Modification of the 21-cm power spectrum by quasars during the epoch of reionisation

J. Stuart B. Wyithe, Paul M. Geil

arxiv:0904.3163 v1 · 2009-04-21 · 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{SMKQVPI6XYY54TWIGVB3WD3YN2}

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	2026-05-18T00:39:53.321643Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

93150abd1ebe31de4ec83543bb0f786ea5e791ff2c52811956466a5893b50044

Aliases

arxiv: 0904.3163 · arxiv_version: 0904.3163v1 · doi: 10.48550/arxiv.0904.3163 · pith_short_12: SMKQVPI6XYY5 · pith_short_16: SMKQVPI6XYY54TWI · pith_short_8: SMKQVPI6

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/SMKQVPI6XYY54TWIGVB3WD3YN2 \
  | 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: 93150abd1ebe31de4ec83543bb0f786ea5e791ff2c52811956466a5893b50044

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3947f43607c39c53474a2c69776766b45a2372ee6b76f5acf41cb09fe27afc33",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-04-21T04:57:04Z",
    "title_canon_sha256": "0a7e142d8a60f5aa10eafca820ef4793d5c2be9d9fecf80e0e876eb62e0e0175"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.3163",
    "kind": "arxiv",
    "version": 1
  }
}