Pith Number

pith:NJ2NHJQQ

pith:2013:NJ2NHJQQ2ZSKAE4IGRSQSVTKEJ

not attested not anchored not stored refs pending

Qualitative analysis of Kantowski-Sachs metric in a generic class of $f(R)$ models

Armando A. Roque (Cienfuegos U., Catolica), CUBA), Genly Leon (Valparaiso U.

arxiv:1308.5921 v2 · 2013-08-27 · astro-ph.CO · gr-qc · hep-th

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NJ2NHJQQ2ZSKAE4IGRSQSVTKEJ}

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	2026-05-18T02:51:08.449079Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6a74d3a610d664a01388346509566a2270ceb1c9fae891fb3f1634b8c45e433e

Aliases

arxiv: 1308.5921 · arxiv_version: 1308.5921v2 · doi: 10.48550/arxiv.1308.5921 · pith_short_12: NJ2NHJQQ2ZSK · pith_short_16: NJ2NHJQQ2ZSKAE4I · pith_short_8: NJ2NHJQQ

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/NJ2NHJQQ2ZSKAE4IGRSQSVTKEJ \
  | 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: 6a74d3a610d664a01388346509566a2270ceb1c9fae891fb3f1634b8c45e433e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4a37ca6366a585940f914764a0a07d90ec2eb530e4f7a47f7c3600a979280d9c",
    "cross_cats_sorted": [
      "gr-qc",
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2013-08-27T16:38:08Z",
    "title_canon_sha256": "83016702d9d212c5126e5b791b6c0612f3d60e85b515b3d33920b2f3ac92fe64"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1308.5921",
    "kind": "arxiv",
    "version": 2
  }
}