Pith Number

pith:K4ZGY6TE

pith:2020:K4ZGY6TEVLKLNA5RVHODTTRA3L

not attested not anchored not stored refs pending

Concerns regarding the use of black hole shadows as standard rulers

Cosimo Bambi, Luca Visinelli, Sunny Vagnozzi

arxiv:2001.02986 v2 · 2020-01-09 · gr-qc · astro-ph.CO · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{K4ZGY6TEVLKLNA5RVHODTTRA3L}

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

3 papers in Pith

Observational Limits on Einasto Dark Matter Parameters from Event Horizon Telescope Images of Sgr A$^{*}$ and M87$^{*}$

$\tt BlackHawk$ $\tt v3.0$: Hawking Radiation from Regular Black Holes

Rotating Black Holes with Primary Scalar Hair: Shadow Signatures in Beyond Horndeski Gravity

Receipt and verification

First computed	2026-07-05T00:52:17.615421Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

57326c7a64aad4b683b1a9dc39ce20dace262150cae7c9fca3ff32caa5fb7150

Aliases

arxiv: 2001.02986 · arxiv_version: 2001.02986v2 · doi: 10.48550/arxiv.2001.02986 · pith_short_12: K4ZGY6TEVLKL · pith_short_16: K4ZGY6TEVLKLNA5R · pith_short_8: K4ZGY6TE

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/K4ZGY6TEVLKLNA5RVHODTTRA3L \
  | 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: 57326c7a64aad4b683b1a9dc39ce20dace262150cae7c9fca3ff32caa5fb7150

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2b9132fd988b22abf44539f92fb5773ed39f585bfbe806818e41ed72a354bc32",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2020-01-09T13:59:49Z",
    "title_canon_sha256": "13ec401bc9ab34601a40cb2ee2155cbf31abc95485598e49f61cbb3df541959b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2001.02986",
    "kind": "arxiv",
    "version": 2
  }
}