Pith Number

pith:2UVKZBYP

pith:2004:2UVKZBYPL2M4IRQAHPMVLSBFQS

not attested not anchored not stored refs pending

Galaxy Formation and the Cosmological Angular Momentum Problem

Andreas Burkert (USM, Garching), Munich) & Elena D'Onghia (MPE

arxiv:astro-ph/0409540 v1 · 2004-09-22 · 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{2UVKZBYPL2M4IRQAHPMVLSBFQS}

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	2026-05-18T01:21:50.098932Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d52aac870f5e99c446003bd955c82584ac5618bea3fc890d724ed3ff651e3a6f

Aliases

arxiv: astro-ph/0409540 · arxiv_version: astro-ph/0409540v1 · doi: 10.48550/arxiv.astro-ph/0409540 · pith_short_12: 2UVKZBYPL2M4 · pith_short_16: 2UVKZBYPL2M4IRQA · pith_short_8: 2UVKZBYP

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/2UVKZBYPL2M4IRQAHPMVLSBFQS \
  | 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: d52aac870f5e99c446003bd955c82584ac5618bea3fc890d724ed3ff651e3a6f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1ddfaa5af40755622a51eae7a457c130ec6fb65c66dcfa990c2bf2d70611da84",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-09-22T13:36:06Z",
    "title_canon_sha256": "d5ec3f7f45aaff7bcc2611ad98f1adb253d8640b0923da911fac033738d73808"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0409540",
    "kind": "arxiv",
    "version": 1
  }
}