Pith Number

pith:WKGEFSIX

pith:2009:WKGEFSIXAAG2WDXZG7CDP3SCBR

not attested not anchored not stored refs pending

Simulations of Direct Collisions of Gas Clouds with the Central Black Hole

Andreas Burkert, Christian Alig, Marc Schartmann, Peter H. Johansson

arxiv:0908.1100 v2 · 2009-08-07 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WKGEFSIXAAG2WDXZG7CDP3SCBR}

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	2026-05-18T04:23:13.414019Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b28c42c917000dab0ef937c437ee420c4bd94f76a986cb38a6314fd33349e1b7

Aliases

arxiv: 0908.1100 · arxiv_version: 0908.1100v2 · doi: 10.48550/arxiv.0908.1100 · pith_short_12: WKGEFSIXAAG2 · pith_short_16: WKGEFSIXAAG2WDXZ · pith_short_8: WKGEFSIX

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/WKGEFSIXAAG2WDXZG7CDP3SCBR \
  | 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: b28c42c917000dab0ef937c437ee420c4bd94f76a986cb38a6314fd33349e1b7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8d694ee53e2f029847aebbd309be89c21da8e7e6bb3a8abb24177b6b9cb0ea2b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-08-07T18:49:44Z",
    "title_canon_sha256": "da9360aaf6e2b9bb3419343778dec243932eef8380957c30985f58c11bb78dc8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.1100",
    "kind": "arxiv",
    "version": 2
  }
}