Pith Number

pith:XI5PZ7IA

pith:2018:XI5PZ7IAQBMXSSBX7TKYWNZL2J

not attested not anchored not stored refs pending

Shadow of a black hole at cosmological distance

Gennady S. Bisnovatyi-Kogan, Oleg Yu. Tsupko

arxiv:1805.03311 v2 · 2018-05-08 · 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{XI5PZ7IAQBMXSSBX7TKYWNZL2J}

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

4 papers in Pith

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A$^*$

Shadows of Giants: Constraints on Stupendously Large Black Holes from Negative Sources against the Cosmic Microwave Background

Shaving off soft hairs and the black hole image memory effect

Probing Kalb-Ramond gravity with charged rotating black holes: constraints from EHT observations

Receipt and verification

First computed	2026-05-18T00:02:34.771689Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ba3afcfd008059794837fcd58b372bd24780e95f7b066a3923ce7bc3fb37be71

Aliases

arxiv: 1805.03311 · arxiv_version: 1805.03311v2 · doi: 10.48550/arxiv.1805.03311 · pith_short_12: XI5PZ7IAQBMX · pith_short_16: XI5PZ7IAQBMXSSBX · pith_short_8: XI5PZ7IA

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/XI5PZ7IAQBMXSSBX7TKYWNZL2J \
  | 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: ba3afcfd008059794837fcd58b372bd24780e95f7b066a3923ce7bc3fb37be71

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "adef364e50164ca847fa7c6ec98040365a917fcba8e71c06c1abb3452d1f9aee",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2018-05-08T22:38:07Z",
    "title_canon_sha256": "1269bb3143df5dc6393df341b95ab38e6a5013e96fe9c91d8e77b873de5fe095"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.03311",
    "kind": "arxiv",
    "version": 2
  }
}