Pith Number

pith:SGCS7M7K

pith:2014:SGCS7M7KC2CRS7JSQL6SB3XNQT

not attested not anchored not stored refs pending

Photons that travel in free space slower than the speed of light

Daniele Faccio, Daniel Giovannini, Fiona Speirits, Gergely Ferenczi, Jacquiline Romero, Miles J. Padgett, Stephen M. Barnett, Vaclav Potocek

arxiv:1411.3987 v1 · 2014-11-14 · physics.optics · 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{SGCS7M7KC2CRS7JSQL6SB3XNQT}

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	2026-05-18T00:39:40.906266Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

91852fb3ea1685197d3282fd20eeed84ffa317c068c1dc062a927a355fd8bb82

Aliases

arxiv: 1411.3987 · arxiv_version: 1411.3987v1 · doi: 10.48550/arxiv.1411.3987 · pith_short_12: SGCS7M7KC2CR · pith_short_16: SGCS7M7KC2CRS7JS · pith_short_8: SGCS7M7K

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/SGCS7M7KC2CRS7JSQL6SB3XNQT \
  | 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: 91852fb3ea1685197d3282fd20eeed84ffa317c068c1dc062a927a355fd8bb82

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "039ea2c2028fd2d7967efd75c634a0e2cc0e1654ce18945cb42a9d7be91a6991",
    "cross_cats_sorted": [
      "quant-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2014-11-14T17:38:17Z",
    "title_canon_sha256": "27d925ae131e0db8595a8208db194b2a552eedf9a9400c9ae489e8eb7b877721"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1411.3987",
    "kind": "arxiv",
    "version": 1
  }
}