Pith Number

pith:EIN4U7EE

pith:1997:EIN4U7EENVYTZLMWM4C5UPDEAB

not attested not anchored not stored refs pending

The unphysical nature of "Warp Drive"

L.H. Ford, Michael J. Pfenning

arxiv:gr-qc/9702026 v3 · 1997-02-13 · 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{EIN4U7EENVYTZLMWM4C5UPDEAB}

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

4 papers in Pith

Steering a warp drive without exotic matter

On the boundary cost of source-consistent warp shells

Observer-robust energy condition verification for warp drive spacetimes

Receipt and verification

First computed	2026-07-04T16:04:36.204689Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

221bca7c846d713cad966705da3c64005dc5d1f904f7d2241271154edc5ec198

Aliases

arxiv: gr-qc/9702026 · arxiv_version: gr-qc/9702026v3 · doi: 10.48550/arxiv.gr-qc/9702026 · pith_short_12: EIN4U7EENVYT · pith_short_16: EIN4U7EENVYTZLMW · pith_short_8: EIN4U7EE

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/EIN4U7EENVYTZLMWM4C5UPDEAB \
  | 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: 221bca7c846d713cad966705da3c64005dc5d1f904f7d2241271154edc5ec198

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8754932b02420dd1b8da7eabfc479d55020674b9527df2c8211315d7858efb43",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "1997-02-13T23:24:10Z",
    "title_canon_sha256": "441315abc60497bd3e0f3f2960d3089b85815b9a9b1bed95b28fa7cb6d097f09"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/9702026",
    "kind": "arxiv",
    "version": 3
  }
}