Pith Number

pith:OY5VWXDB

pith:2015:OY5VWXDBZTIHZCR7L27MVMGJKX

not attested not anchored not stored refs pending

How superluminal motion can lead to backward time travel

David M. Russell, Robert J. Nemiroff

arxiv:1505.07489 v2 · 2015-05-27 · physics.pop-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OY5VWXDBZTIHZCR7L27MVMGJKX}

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	2026-05-18T01:33:34.939699Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

763b5b5c61ccd07c8a3f5ebecab0c955d3637103d2e14ea5ec06ef86684b9d8e

Aliases

arxiv: 1505.07489 · arxiv_version: 1505.07489v2 · doi: 10.48550/arxiv.1505.07489 · pith_short_12: OY5VWXDBZTIH · pith_short_16: OY5VWXDBZTIHZCR7 · pith_short_8: OY5VWXDB

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/OY5VWXDBZTIHZCR7L27MVMGJKX \
  | 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: 763b5b5c61ccd07c8a3f5ebecab0c955d3637103d2e14ea5ec06ef86684b9d8e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "453f77a7933aa1894b5e0c4436d0e2cb9fd6c0ad6481d63ebfb5f126c3c11c80",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2015-05-27T20:47:27Z",
    "title_canon_sha256": "60c84f4f45b4a02b61cd4742149ba7534d10468acd8a29fe37d901d683a9ab93"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.07489",
    "kind": "arxiv",
    "version": 2
  }
}