Pith Number

pith:CXK7DFDY

pith:2018:CXK7DFDYXQ6IEJ4Q5O4IZFFVXS

not attested not anchored not stored refs pending

Can the apparent expansion of the Universe be attributed to an increasing vacuum refractive index ?

A. Djannati-Atai, F. Couchot, M. Urban, X. Sarazin

arxiv:1805.03503 v1 · 2018-05-03 · physics.gen-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CXK7DFDYXQ6IEJ4Q5O4IZFFVXS}

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	2026-05-18T00:14:13.641383Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

15d5f19478bc3c822790ebb88c94b5bc8abddffa5603c16a233a4df67a4ca80f

Aliases

arxiv: 1805.03503 · arxiv_version: 1805.03503v1 · doi: 10.48550/arxiv.1805.03503 · pith_short_12: CXK7DFDYXQ6I · pith_short_16: CXK7DFDYXQ6IEJ4Q · pith_short_8: CXK7DFDY

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/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS \
  | 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: 15d5f19478bc3c822790ebb88c94b5bc8abddffa5603c16a233a4df67a4ca80f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5b88a62cd38e60a0eff6a4d4ea6368f9eb46d1b58e38b4cc0178b9df912b2601",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.gen-ph",
    "submitted_at": "2018-05-03T14:48:19Z",
    "title_canon_sha256": "5fa725b77f0a42e930425594716f1c42457d9f86949ffbe8e14c004244c7d46c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.03503",
    "kind": "arxiv",
    "version": 1
  }
}