Pith Number

pith:7SPVQW2W

pith:2018:7SPVQW2WMEMESCJZRDROBTAGPB

not attested not anchored not stored refs pending

Photoionization models for extreme Ly$\alpha$ $\lambda$1216 and HeII $\lambda$1640 ratios in quasar halos, and PopIII vs AGN diagnostics

(2) Centro de Astrobiolog\'ia (INTA-CSIC), (3) Instituto de Astronom\'ia, 4) ((1) Instituto de Astrof\'isica e Ci\^encias do Espa\c{c}o, (4) Indian Institute of Technology Guwahati, A. Humphrey (1), CAUP, Ctra de Torrej\'on a Ajalvir, Guwahati, India), L. Binette (3), Madrid, M\'exico, M\'exico D.F., M. Villar-Mart\'in (2), Portugal, PT4150-762 Porto, R. Raj (1, Rua das Estrelas, Spain, Torrej\'on de Ardoz, Universidade do Porto, Universidad Nacional Aut\'onomo de M\'exico

arxiv:1810.04463 v1 · 2018-10-10 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7SPVQW2WMEMESCJZRDROBTAGPB}

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	2026-05-17T23:57:35.703102Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc9f585b56611849093988e2e0cc067861f7d89c5c7076c666df14fe0b770d21

Aliases

arxiv: 1810.04463 · arxiv_version: 1810.04463v1 · doi: 10.48550/arxiv.1810.04463 · pith_short_12: 7SPVQW2WMEME · pith_short_16: 7SPVQW2WMEMESCJZ · pith_short_8: 7SPVQW2W

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/7SPVQW2WMEMESCJZRDROBTAGPB \
  | 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: fc9f585b56611849093988e2e0cc067861f7d89c5c7076c666df14fe0b770d21

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "27c442c89ee45b8b3b4f8f689e6b7a0904c6cc854c4bcb46b0c0570b6ba8787d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-10-10T11:32:56Z",
    "title_canon_sha256": "cc9b6525695a765b03b5a76ae5bcccee865ee78854f438de1e4ccede68788066"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.04463",
    "kind": "arxiv",
    "version": 1
  }
}