Pith Number

pith:2CT4L2BG

pith:2018:2CT4L2BG53YY2EY5UGNXF36CGP

not attested not anchored not stored refs pending

The first power spectrum limit on the 21-cm signal of neutral hydrogen during the Cosmic Dawn at z=20-25 from LOFAR

(10) Department of Astronomy, (11) Leiden Observatory, 2), 2) ((1) Kapteyn Astronomical Institute, (2) ASTRON, 3), (3) Department of Natural Sciences, (4) Max-Planck Institute for Astrophysics, (5) Department of Physics, 6), (6) SKA South Africa, (7) Astronomy Centre, (8) Ru{\dj}er Bo\v{s}kovi\'c Institute, 9), (9) Department of Physics, A. Ghosh (5, AlbaNova, A. M. Sardarabadi (1), A. R. Offringa (2), Astronomy, B. Ciardi (4), B. K. Gehlot (1), Brighton, Cape Town South Africa, Croatia, Department of Physics, Dwingeloo, F. G. Mertens (1), F. Krause (1, Garching, Germany, G. Mellema (10), Groningen, H. K. Vedantham (2), Israel, I. T. Iliev (7), J. Schaye (11), Leiden, Leiden University, London, L. V. E. Koopmans (1), M. A. Brentjens (2), M. B. Silva (1), M. Hatef (1, M. Mevius (2), M. Mitra (1), Netherlands Institute for Radio Astronomy, Oskar Klein Centre for Cosmoparticle Physics, Pinelands, Ra'anana, R. Kooistra (1), South Africa, Stockholm, Stockholm University, Sweden, S. Yatawatta (1, S. Zaroubi (1, the Netherlands), The Netherlands, The Open University of Israel, U.K., University College London, University of Groningen, University of Sussex, University of the Western Cape, V. Jeli\'c (8), V. N. Pandey (1, Zagreb

arxiv:1809.06661 v2 · 2018-09-18 · astro-ph.IM

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

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	2026-05-17T23:40:04.267513Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d0a7c5e826eef18d131da19b72efc233e15514e69ee6fad76b7a4e8f684903f3

Aliases

arxiv: 1809.06661 · arxiv_version: 1809.06661v2 · doi: 10.48550/arxiv.1809.06661 · pith_short_12: 2CT4L2BG53YY · pith_short_16: 2CT4L2BG53YY2EY5 · pith_short_8: 2CT4L2BG

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/2CT4L2BG53YY2EY5UGNXF36CGP \
  | 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: d0a7c5e826eef18d131da19b72efc233e15514e69ee6fad76b7a4e8f684903f3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7e95b988a5962f8af50ff8201c16e2ad521382f0c6e0355a291047f4ae662d61",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2018-09-18T12:15:13Z",
    "title_canon_sha256": "424e444a7b4fe30c5cef54e1272cb5f4db59c6302abab8baf641d8311a612789"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.06661",
    "kind": "arxiv",
    "version": 2
  }
}