Pith Number

pith:QA5XPVHV

pith:1998:QA5XPVHVD2YODCB3PMJCIYIOI5

not attested not anchored not stored refs pending

Determining the Equation of State of the Expanding Universe: Inverse Problem in Cosmology

Takashi Nakamura, Takeshi Chiba

arxiv:astro-ph/9810447 v3 · 1998-10-28 · astro-ph · hep-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{QA5XPVHVD2YODCB3PMJCIYIOI5}

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.

Cited by

2 papers in Pith

EFT of Dark Energy with Cosmic Chronometers: Reconstructing Background EFT Functions

An essential building block for cosmological zoom-in perturbation theory

Receipt and verification

First computed	2026-07-04T16:07:08.778762Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

803b77d4f51eb0e1883b7b1224610e4756db50aa1211c8da0df66c175731970f

Aliases

arxiv: astro-ph/9810447 · arxiv_version: astro-ph/9810447v3 · doi: 10.48550/arxiv.astro-ph/9810447 · pith_short_12: QA5XPVHVD2YO · pith_short_16: QA5XPVHVD2YODCB3 · pith_short_8: QA5XPVHV

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/QA5XPVHVD2YODCB3PMJCIYIOI5 \
  | 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: 803b77d4f51eb0e1883b7b1224610e4756db50aa1211c8da0df66c175731970f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "07387814de9e3144d38a6b45416120463487b58dbf950cb6ef3b52e0c74501d0",
    "cross_cats_sorted": [
      "hep-ph"
    ],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1998-10-28T07:15:46Z",
    "title_canon_sha256": "938857800fd3a2fc3c0d12032275fe608d3a586ee5aaa0e81190208b80f64852"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9810447",
    "kind": "arxiv",
    "version": 3
  }
}