Pith Number

pith:WQ7EP7PJ

pith:2000:WQ7EP7PJTWK4KAXPXA2F2EVVLD

not attested not anchored not stored refs pending

How does the electromagnetic field couple to gravity, in particular to metric, nonmetricity, torsion, and curvature?

Friedrich W. Hehl, Yuri N. Obukhov

arxiv:gr-qc/0001010 v2 · 2000-01-06 · 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{WQ7EP7PJTWK4KAXPXA2F2EVVLD}

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	2026-05-18T00:55:39.995404Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b43e47fde99d95c502efb8345d12b558e34b7fce372688065ab823ee0b896b5d

Aliases

arxiv: gr-qc/0001010 · arxiv_version: gr-qc/0001010v2 · doi: 10.48550/arxiv.gr-qc/0001010 · pith_short_12: WQ7EP7PJTWK4 · pith_short_16: WQ7EP7PJTWK4KAXP · pith_short_8: WQ7EP7PJ

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/WQ7EP7PJTWK4KAXPXA2F2EVVLD \
  | 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: b43e47fde99d95c502efb8345d12b558e34b7fce372688065ab823ee0b896b5d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a16da5c86221331884b307e613ce57d7a0213949c916232efa3792c0ab64d196",
    "cross_cats_sorted": [
      "hep-th"
    ],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "2000-01-06T09:50:52Z",
    "title_canon_sha256": "55e895b1d140ec8463059388e947ba1bbc34219eb09cbc4e9a17eb5aeb55107c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/0001010",
    "kind": "arxiv",
    "version": 2
  }
}