Pith Number

pith:CNDET7QY

pith:2008:CNDET7QYI5VFHYYEWOQ3EMSWL3

not attested not anchored not stored refs pending

Energy conditions constraints on a class of f(R)-gravity

J.S. Alcaniz, J. Santos, M.J. Reboucas

arxiv:0807.2443 v2 · 2008-07-15 · astro-ph · 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{CNDET7QYI5VFHYYEWOQ3EMSWL3}

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	2026-05-18T04:41:04.006913Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

134649fe18476a53e304b3a1b232565efa377e2331bce251b67f46d863f22f62

Aliases

arxiv: 0807.2443 · arxiv_version: 0807.2443v2 · doi: 10.48550/arxiv.0807.2443 · pith_short_12: CNDET7QYI5VF · pith_short_16: CNDET7QYI5VFHYYE · pith_short_8: CNDET7QY

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/CNDET7QYI5VFHYYEWOQ3EMSWL3 \
  | 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: 134649fe18476a53e304b3a1b232565efa377e2331bce251b67f46d863f22f62

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3f463dcb8f77d72d2389e6dbe4d986b27937f20bf9282af929c0965def5fa31d",
    "cross_cats_sorted": [
      "gr-qc",
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-07-15T20:05:16Z",
    "title_canon_sha256": "b8ffd53a030185ba5312fc305bfaf7f628b0b820cbfea3657693b264dbaca4ce"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0807.2443",
    "kind": "arxiv",
    "version": 2
  }
}