Pith Number

pith:DMSJHFAN

pith:2009:DMSJHFANWQKMBWN6CX6NC6QZIQ

not attested not anchored not stored refs pending

On dynamical friction in a gaseous medium with a boundary

Fathi Namouni

arxiv:0911.4891 v2 · 2009-11-25 · astro-ph.GA · astro-ph.EP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DMSJHFANWQKMBWN6CX6NC6QZIQ}

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	2026-05-18T04:31:41.427946Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1b2493940db414c0d9be15fcd17a1944378cba871126b9056012f9d1ad235040

Aliases

arxiv: 0911.4891 · arxiv_version: 0911.4891v2 · doi: 10.48550/arxiv.0911.4891 · pith_short_12: DMSJHFANWQKM · pith_short_16: DMSJHFANWQKMBWN6 · pith_short_8: DMSJHFAN

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/DMSJHFANWQKMBWN6CX6NC6QZIQ \
  | 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: 1b2493940db414c0d9be15fcd17a1944378cba871126b9056012f9d1ad235040

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bc38b2556b70dd765e2945d2f67464f2e129218ce5ce1a1825f23f5382d8d10f",
    "cross_cats_sorted": [
      "astro-ph.EP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-11-25T15:59:03Z",
    "title_canon_sha256": "84a50807d24a2e0f4c65c1e735a6f022351e90728ba376668d06d011d6f63cb8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0911.4891",
    "kind": "arxiv",
    "version": 2
  }
}