Pith Number

pith:O6PXQOQQ

pith:2021:O6PXQOQQ2CVPY7KQ57TQI24OUL

not attested not anchored not stored refs pending

Measurement of Penrose superradiance in a photon superfluid

Angus Prain, Calum Maitland, Daniele Faccio, Ewan M. Wright, Francesco Marino, Ilya Starshynov, Maria Chiara Braidotti, Niclas Westerberg, Radivoje Prizia

arxiv:2109.02307 v1 · 2021-09-06 · physics.optics · 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{O6PXQOQQ2CVPY7KQ57TQI24OUL}

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	2026-07-05T03:11:41.019372Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

779f783a10d0aafc7d50efe7046b8ea2e242a7172f5e13dd2f8522c5e474c756

Aliases

arxiv: 2109.02307 · arxiv_version: 2109.02307v1 · doi: 10.48550/arxiv.2109.02307 · pith_short_12: O6PXQOQQ2CVP · pith_short_16: O6PXQOQQ2CVPY7KQ · pith_short_8: O6PXQOQQ

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/O6PXQOQQ2CVPY7KQ57TQI24OUL \
  | 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: 779f783a10d0aafc7d50efe7046b8ea2e242a7172f5e13dd2f8522c5e474c756

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d80f23d9bf6edd93e98e7ce06a560a1fece328e5782a3e751cd12d5e3fe147fd",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2021-09-06T09:11:32Z",
    "title_canon_sha256": "1c868fa3624f3bfd914b1300f1dc74cad01106f6bb40e4117cce39c2cbfb86cf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2109.02307",
    "kind": "arxiv",
    "version": 1
  }
}