Pith Number

pith:RHJOCQFH

pith:2007:RHJOCQFH5L74ZU2JNK4CKPKY72

not attested not anchored not stored refs pending

The Cosmology of f(R) Gravity in the Metric Variational Approach

Baojiu Li, John D. Barrow

arxiv:gr-qc/0701111 v2 · 2007-01-19 · gr-qc · astro-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{RHJOCQFH5L74ZU2JNK4CKPKY72}

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

2 papers in Pith

Cosmological higher-curvature gravities

Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution

Receipt and verification

First computed	2026-07-04T15:16:38.364101Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

89d2e140a7eaffccd3496ab8253d58fe887cf8d11edef14db3daf4dcee9f3d19

Aliases

arxiv: gr-qc/0701111 · arxiv_version: gr-qc/0701111v2 · doi: 10.48550/arxiv.gr-qc/0701111 · pith_short_12: RHJOCQFH5L74 · pith_short_16: RHJOCQFH5L74ZU2J · pith_short_8: RHJOCQFH

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/RHJOCQFH5L74ZU2JNK4CKPKY72 \
  | 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: 89d2e140a7eaffccd3496ab8253d58fe887cf8d11edef14db3daf4dcee9f3d19

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "28f54661c345b6c701f2f9d31dcec353f0d229629b96d444d4e154a6c947a3f6",
    "cross_cats_sorted": [
      "astro-ph"
    ],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "2007-01-19T21:12:48Z",
    "title_canon_sha256": "3afb2cdf6079ff2ad38775adcd45eb7a02422eeb84d0873de05ae50683ff29f4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/0701111",
    "kind": "arxiv",
    "version": 2
  }
}