Pith Number

pith:OXGXSPR2

pith:1992:OXGXSPR2AEB2DHFRRG4GFEZTCX

not attested not anchored not stored refs pending

From wormhole to time machine: Comments on Hawking's Chronology Protection Conjecture

By Matt Visser

arxiv:hep-th/9202090 v2 · 1992-02-26 · hep-th

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OXGXSPR2AEB2DHFRRG4GFEZTCX}

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.

Cited by

1 paper in Pith

Scalar Instabilities Inside The Extremal Dyonic Kerr-Sen Black Hole: Novel Exact Solutions and Chronology Protection Conjecture

Receipt and verification

First computed	2026-07-04T15:55:19.657909Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

75cd793e3a0103a19cb189b862933315f8b394c0f80816c619db3cda78a30db6

Aliases

arxiv: hep-th/9202090 · arxiv_version: hep-th/9202090v2 · doi: 10.48550/arxiv.hep-th/9202090 · pith_short_12: OXGXSPR2AEB2 · pith_short_16: OXGXSPR2AEB2DHFR · pith_short_8: OXGXSPR2

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/OXGXSPR2AEB2DHFRRG4GFEZTCX \
  | 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: 75cd793e3a0103a19cb189b862933315f8b394c0f80816c619db3cda78a30db6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cfafef4e6da7c02e93be61c151a4ae026808a43569dd77336df66c46f9d6c6a0",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "hep-th",
    "submitted_at": "1992-02-26T20:32:21Z",
    "title_canon_sha256": "ac97bf106565905f8029bf9d4720869bd84990240c6212d61be4e835a042c6e0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "hep-th/9202090",
    "kind": "arxiv",
    "version": 2
  }
}