Pith Number

pith:27ZDUZSM

pith:1998:27ZDUZSMNQ6BGGDYL7DI4XKECA

not attested not anchored not stored refs pending

Quasi-Spherical Light Cones of the Kerr Geometry

Frans Pretorius, Werner Israel

arxiv:gr-qc/9803080 v1 · 1998-03-25 · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{27ZDUZSMNQ6BGGDYL7DI4XKECA}

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	2026-07-04T16:08:47.280175Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d7f23a664c6c3c1318785fc68e5d441023b5ce2fcfcaf09016ea2a38e01eb8d8

Aliases

arxiv: gr-qc/9803080 · arxiv_version: gr-qc/9803080v1 · doi: 10.48550/arxiv.gr-qc/9803080 · pith_short_12: 27ZDUZSMNQ6B · pith_short_16: 27ZDUZSMNQ6BGGDY · pith_short_8: 27ZDUZSM

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/27ZDUZSMNQ6BGGDYL7DI4XKECA \
  | 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: d7f23a664c6c3c1318785fc68e5d441023b5ce2fcfcaf09016ea2a38e01eb8d8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "664675e22be2d10a39261be0f97c7abe87ca4da06a6634caeabbabdfb7666c91",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "1998-03-25T04:48:44Z",
    "title_canon_sha256": "6d1f1a0e046c3a9ad7169a971ce24c0c84e5d986b75ecfa719120fe3b7e15ba6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/9803080",
    "kind": "arxiv",
    "version": 1
  }
}