Pith Number

pith:DIG5RXVC

pith:2012:DIG5RXVCAXFMKWTRXGO6KULC7L

not attested not anchored not stored refs pending

Traversable Wormholes and Time Machines in non-minimally coupled curvature-matter $f(R)$ theories

Orfeu Bertolami, Ricardo Zambujal Ferreira

arxiv:1203.0523 v2 · 2012-03-02 · 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{DIG5RXVCAXFMKWTRXGO6KULC7L}

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	2026-05-18T03:22:51.746528Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1a0dd8dea205cac55a71b99de55162faec5a17b8ad345e69cfe5ccc97d5d4bba

Aliases

arxiv: 1203.0523 · arxiv_version: 1203.0523v2 · doi: 10.48550/arxiv.1203.0523 · pith_short_12: DIG5RXVCAXFM · pith_short_16: DIG5RXVCAXFMKWTR · pith_short_8: DIG5RXVC

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/DIG5RXVCAXFMKWTRXGO6KULC7L \
  | 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: 1a0dd8dea205cac55a71b99de55162faec5a17b8ad345e69cfe5ccc97d5d4bba

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "23bf51ecabb8b47872d3d1341a96b9697188b351b8b8fc8d4c416cfeaaa18065",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2012-03-02T17:13:46Z",
    "title_canon_sha256": "40614c0f1df235044cc9d09ab45522c54355cc2694f4246795603092a3e053af"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.0523",
    "kind": "arxiv",
    "version": 2
  }
}