Pith Number

pith:UY5LPJ2Y

pith:2005:UY5LPJ2YYPY4QL2TEEZ7554XQO

not attested not anchored not stored refs pending

The Lyman-alpha forest as a probe of fundamental physics

Matteo Viel

arxiv:astro-ph/0504645 v1 · 2005-04-28 · astro-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{UY5LPJ2YYPY4QL2TEEZ7554XQO}

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	2026-07-04T16:52:17.204680Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a63ab7a758c3f1c82f532133fef79783931cb156474a4266dffef505dda0878a

Aliases

arxiv: astro-ph/0504645 · arxiv_version: astro-ph/0504645v1 · doi: 10.48550/arxiv.astro-ph/0504645 · pith_short_12: UY5LPJ2YYPY4 · pith_short_16: UY5LPJ2YYPY4QL2T · pith_short_8: UY5LPJ2Y

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/UY5LPJ2YYPY4QL2TEEZ7554XQO \
  | 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: a63ab7a758c3f1c82f532133fef79783931cb156474a4266dffef505dda0878a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7dab60846bd712ab52a66f00d6a0e4ba064611267e4a6d19d9d7e3794a78330b",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2005-04-28T18:25:29Z",
    "title_canon_sha256": "0709b35442f2001ed23bb7f68d17837f67557345721d963aa81cc3f4f2938476"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0504645",
    "kind": "arxiv",
    "version": 1
  }
}