Pith Number

pith:NRA7SFZF

pith:2012:NRA7SFZFRIXD4CGBCP3OI2KAU2

not attested not anchored not stored refs pending

A Born-Infeld-like f(R) gravity

J. C. Fabris, N. Pinto-Neto, R. S. Perez, S. E. Perez Bergliaffa

arxiv:1205.3458 v3 · 2012-05-15 · gr-qc · astro-ph.CO · 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{NRA7SFZFRIXD4CGBCP3OI2KAU2}

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	2026-05-18T03:37:08.581684Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6c41f917258a2e3e08c113f6e46940a6aa1bd1964a0981dbc483315971f7c0b4

Aliases

arxiv: 1205.3458 · arxiv_version: 1205.3458v3 · doi: 10.48550/arxiv.1205.3458 · pith_short_12: NRA7SFZFRIXD · pith_short_16: NRA7SFZFRIXD4CGB · pith_short_8: NRA7SFZF

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/NRA7SFZFRIXD4CGBCP3OI2KAU2 \
  | 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: 6c41f917258a2e3e08c113f6e46940a6aa1bd1964a0981dbc483315971f7c0b4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "140f848481273ee7eb63e9d8a264b14c3161a800a1619d14c9f43baad2f15d7a",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2012-05-15T17:51:54Z",
    "title_canon_sha256": "d9916e6777e1c995e3b72fb171c51480a20d8d9f88f072e3f4958c324e8c9599"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1205.3458",
    "kind": "arxiv",
    "version": 3
  }
}