Pith Number

pith:25XJBD6L

pith:2014:25XJBD6LMQRWRHMJK4BFZN4UHD

not attested not anchored not stored refs pending

Modified gravity from an entropy functional

Fay\c{c}al Hammad

arxiv:1408.6577 v2 · 2014-08-27 · 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{25XJBD6LMQRWRHMJK4BFZN4UHD}

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

1 paper in Pith

Is The Internal Entropy of F(R)-Gravity Really An Entropy?

Receipt and verification

First computed	2026-05-18T01:35:20.666575Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d76e908fcb6423689d8957025cb79438d2a9a6c6fe0086ebc4089a1fda31c467

Aliases

arxiv: 1408.6577 · arxiv_version: 1408.6577v2 · doi: 10.48550/arxiv.1408.6577 · pith_short_12: 25XJBD6LMQRW · pith_short_16: 25XJBD6LMQRWRHMJ · pith_short_8: 25XJBD6L

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/25XJBD6LMQRWRHMJK4BFZN4UHD \
  | 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: d76e908fcb6423689d8957025cb79438d2a9a6c6fe0086ebc4089a1fda31c467

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c35b652deaaad84c1a750edab1055ab4db720792e86da549c818bc8c5d9f6c57",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2014-08-27T21:58:05Z",
    "title_canon_sha256": "9afcbffdafb49ce1539cc730d7758caa75835ecc0c1d726e5d9adf61b8b667e8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1408.6577",
    "kind": "arxiv",
    "version": 2
  }
}