Pith Number

pith:RUAF7BCQ

pith:2010:RUAF7BCQLYG7LCMEWKZJHHTIW2

not attested not anchored not stored refs pending

It's Hard to Learn How Gravity and Electromagnetism Couple

David M. Jacobs, Glenn D. Starkman, Yifung Ng, Yi-Zen Chu

arxiv:1007.3992 v2 · 2010-07-22 · 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{RUAF7BCQLYG7LCMEWKZJHHTIW2}

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	2026-05-18T03:56:10.835484Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8d005f84505e0df58984b2b2939e68b6a87c8ed64ffc28cde3711d3df2b2aa4a

Aliases

arxiv: 1007.3992 · arxiv_version: 1007.3992v2 · doi: 10.48550/arxiv.1007.3992 · pith_short_12: RUAF7BCQLYG7 · pith_short_16: RUAF7BCQLYG7LCME · pith_short_8: RUAF7BCQ

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/RUAF7BCQLYG7LCMEWKZJHHTIW2 \
  | 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: 8d005f84505e0df58984b2b2939e68b6a87c8ed64ffc28cde3711d3df2b2aa4a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "02b2471297d101a5ef3ec6fea776a42eaf62f05db5e4c3c9daeb7c23892535e6",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2010-07-22T20:00:20Z",
    "title_canon_sha256": "f8ef13c62cfa1b4948819d4e353a8f9340e7c5ba2b87dd393eea6d379a59da17"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1007.3992",
    "kind": "arxiv",
    "version": 2
  }
}