Pith Number

pith:2PVB7RZP

pith:2018:2PVB7RZPWMJLGQP5LO4PFKXNCT

not attested not anchored not stored refs pending

Measurement of the primordial helium abundance from the intergalactic medium

2) ((1) Centre for Extragalactic Astronomy, (2) Institute for Computational Cosmology, Durham University, Durham University), Michele Fumagalli (1, Ryan Cooke (1)

arxiv:1810.06561 v1 · 2018-10-15 · astro-ph.CO · astro-ph.GA

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Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2PVB7RZPWMJLGQP5LO4PFKXNCT}

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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

4 papers in Pith

Exploring the Dark Sector: Interacting Radiation in Light of Modern Cosmological Probes

Fifty years of primordial helium abundances: A statistical reanalysis

Cosmic evolution of the helium and oxygen abundances in type 2 Active Galactic Nuclei: Helium-loud AGNs

Interacting $k$-essence field with non-pressureless Dark Matter: Cosmological Dynamics and Observational Constraints

Receipt and verification

First computed	2026-05-18T00:03:14.200547Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d3ea1fc72fb312b341fd5bb8f2aaed14c98034f3390585901e84cde05beb02fe

Aliases

arxiv: 1810.06561 · arxiv_version: 1810.06561v1 · doi: 10.48550/arxiv.1810.06561 · pith_short_12: 2PVB7RZPWMJL · pith_short_16: 2PVB7RZPWMJLGQP5 · pith_short_8: 2PVB7RZP

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/2PVB7RZPWMJLGQP5LO4PFKXNCT \
  | 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: d3ea1fc72fb312b341fd5bb8f2aaed14c98034f3390585901e84cde05beb02fe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4a0ad65771c4ba8052de9b274cb3aa232d83dd693689ade2ca6f00a67b445cd6",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2018-10-15T18:00:00Z",
    "title_canon_sha256": "139e0d242a7993a53d35a529ba26865bbb436820d37f9417040e182f2f68070f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.06561",
    "kind": "arxiv",
    "version": 1
  }
}