Pith Number

pith:HIFVV225

pith:2007:HIFVV225BFWUXO6K7WKN6STRLN

not attested not anchored not stored refs pending

Faster than light in a birefringent crystal

Jon Magne Leinaas, Tore Gunnar Halvorsen

arxiv:0710.4457 v1 · 2007-10-24 · quant-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{HIFVV225BFWUXO6K7WKN6STRLN}

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	2026-05-18T02:16:10.194409Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3a0b5aeb5d096d4bbbcafd94df4a715b7b22014782605ee2f1fddb1e7d9e3012

Aliases

arxiv: 0710.4457 · arxiv_version: 0710.4457v1 · doi: 10.48550/arxiv.0710.4457 · pith_short_12: HIFVV225BFWU · pith_short_16: HIFVV225BFWUXO6K · pith_short_8: HIFVV225

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/HIFVV225BFWUXO6K7WKN6STRLN \
  | 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: 3a0b5aeb5d096d4bbbcafd94df4a715b7b22014782605ee2f1fddb1e7d9e3012

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0eb12d8b1e2bc922f505469f026d9be7526118ed7928356ea0ac7bd21aceb0f9",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "quant-ph",
    "submitted_at": "2007-10-24T12:52:55Z",
    "title_canon_sha256": "fef6d10f95c0ab75174f297f6f43bd3e686ded5632f2df7c6506de2a9b2afe85"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0710.4457",
    "kind": "arxiv",
    "version": 1
  }
}