Pith Number

pith:QCICS6MJ

pith:2013:QCICS6MJWJLO4W4ZF25GKP7PVI

not attested not anchored not stored refs pending

Constraining possible variations of the fine structure constant in strong gravitational fields with the K$\alpha$ iron line

Cosimo Bambi

arxiv:1308.2470 v2 · 2013-08-12 · gr-qc · astro-ph.HE

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QCICS6MJWJLO4W4ZF25GKP7PVI}

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	2026-05-18T02:56:11.554986Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8090297989b256ee5b992eba653fefaa22256df5d088fe053836359f795f0054

Aliases

arxiv: 1308.2470 · arxiv_version: 1308.2470v2 · doi: 10.48550/arxiv.1308.2470 · pith_short_12: QCICS6MJWJLO · pith_short_16: QCICS6MJWJLO4W4Z · pith_short_8: QCICS6MJ

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/QCICS6MJWJLO4W4ZF25GKP7PVI \
  | 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: 8090297989b256ee5b992eba653fefaa22256df5d088fe053836359f795f0054

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "52c7a22ba12ad87909f90014d8410591741b53d78a04efdce83d7884ad026b85",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2013-08-12T06:18:54Z",
    "title_canon_sha256": "39072d0773eecaab8afbd1a17a35acf8d06091e2b2a7fe504876c42970748ca5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1308.2470",
    "kind": "arxiv",
    "version": 2
  }
}