Pith Number

pith:I6TKAFPD

pith:2009:I6TKAFPDK5XO7SBV6LTVVRSAXW

not attested not anchored not stored refs pending

The 21 cm Forest as a Probe of the Reionization and the Temperature of the Intergalactic Medium

Hy Trac, Renyue Cen, Xuelei Chen, Yidong Xu, Zuhui Fan

arxiv:0904.4254 v3 · 2009-04-27 · astro-ph.CO

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

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.

Cited by

1 paper in Pith

Topological Signatures of Heating and Dark Matter in the 21 cm Forest

Receipt and verification

First computed	2026-05-18T02:34:59.517598Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

47a6a015e3576eefc835f2e75ac640bdb180892b441ddac47e5b89b523bfe846

Aliases

arxiv: 0904.4254 · arxiv_version: 0904.4254v3 · doi: 10.48550/arxiv.0904.4254 · pith_short_12: I6TKAFPDK5XO · pith_short_16: I6TKAFPDK5XO7SBV · pith_short_8: I6TKAFPD

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/I6TKAFPDK5XO7SBV6LTVVRSAXW \
  | 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: 47a6a015e3576eefc835f2e75ac640bdb180892b441ddac47e5b89b523bfe846

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a68fce9592411a1abefdf1b50a4895df1d1efebb0ab874235ef03ba2f011d9ca",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-04-27T20:08:09Z",
    "title_canon_sha256": "ae30e0ca9553bb956d76c3a766de4ed6359cb9a6a14b321b3d452b590882ad86"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.4254",
    "kind": "arxiv",
    "version": 3
  }
}