Pith Number

pith:GY4VWDYP

pith:2009:GY4VWDYPXBMHDW4UJPXMLH3EKW

not attested not anchored not stored refs pending

A Fast New Public Code for Computing Photon Orbits in a Kerr Spacetime

Eric Agol, Jason Dexter

arxiv:0903.0620 v1 · 2009-03-03 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{GY4VWDYPXBMHDW4UJPXMLH3EKW}

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	2026-05-18T04:29:16.196792Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

36395b0f0fb85871db944beec59f6455a9fe037c2717e1e76d37d0f222fe08cc

Aliases

arxiv: 0903.0620 · arxiv_version: 0903.0620v1 · doi: 10.48550/arxiv.0903.0620 · pith_short_12: GY4VWDYPXBMH · pith_short_16: GY4VWDYPXBMHDW4U · pith_short_8: GY4VWDYP

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/GY4VWDYPXBMHDW4UJPXMLH3EKW \
  | 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: 36395b0f0fb85871db944beec59f6455a9fe037c2717e1e76d37d0f222fe08cc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b7599216a5d6625e22152dcd58513f7835614a65b53d0962dd3d8b0c3d93a360",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2009-03-03T23:35:05Z",
    "title_canon_sha256": "62979ab39f3ec133c6d32c1093a2ee73e5e99ef3851e6028374aedb8984b89b6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.0620",
    "kind": "arxiv",
    "version": 1
  }
}