Pith Number

pith:47JD7HYL

pith:2011:47JD7HYLF2D4DGGCK6ZJ3WYKBK

not attested not anchored not stored refs pending

Perturbations in dark energy models with evolving speed of sound

Rizwan ul Haq Ansari, Sanil Unnikrishnan

arxiv:1104.4609 v1 · 2011-04-24 · astro-ph.CO · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{47JD7HYLF2D4DGGCK6ZJ3WYKBK}

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	2026-05-18T04:23:33.756285Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e7d23f9f0b2e87c198c257b29ddb0a0ab22e1760874743e542b967305f1868c9

Aliases

arxiv: 1104.4609 · arxiv_version: 1104.4609v1 · doi: 10.48550/arxiv.1104.4609 · pith_short_12: 47JD7HYLF2D4 · pith_short_16: 47JD7HYLF2D4DGGC · pith_short_8: 47JD7HYL

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/47JD7HYLF2D4DGGCK6ZJ3WYKBK \
  | 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: e7d23f9f0b2e87c198c257b29ddb0a0ab22e1760874743e542b967305f1868c9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "def1e9db3fa3d5a1bedea24d1bc8503c06e7b35379482729736e21c902982882",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-04-24T08:11:56Z",
    "title_canon_sha256": "09087458eff4c80cec54a67ad1a0468b96861d2a8c2fa1e3d40bea176388873a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1104.4609",
    "kind": "arxiv",
    "version": 1
  }
}