Pith Number

pith:LD2VW22J

pith:2019:LD2VW22JGF2ZXTXF3ANXWUHCUW

not attested not anchored not stored refs pending

Is de Sitter space always excluded in semiclassical f(R) gravity?

Andrea Giugno, Andrea Giusti, Roberto Casadio, Valerio Faraoni

arxiv:1903.07685 v2 · 2019-03-18 · gr-qc · hep-th

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{LD2VW22JGF2ZXTXF3ANXWUHCUW}

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	2026-05-17T23:43:02.915108Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

58f55b6b4931759bcee5d81b7b50e2a5a297b86d10bf6cb3305c5cd851912dac

Aliases

arxiv: 1903.07685 · arxiv_version: 1903.07685v2 · doi: 10.48550/arxiv.1903.07685 · pith_short_12: LD2VW22JGF2Z · pith_short_16: LD2VW22JGF2ZXTXF · pith_short_8: LD2VW22J

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/LD2VW22JGF2ZXTXF3ANXWUHCUW \
  | 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: 58f55b6b4931759bcee5d81b7b50e2a5a297b86d10bf6cb3305c5cd851912dac

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "63a5986c5af6f77834a4602161b0c24260f4115ea647b07222fcf0778ab45f33",
    "cross_cats_sorted": [
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2019-03-18T19:28:39Z",
    "title_canon_sha256": "d155ac620feec4175ba6fb03738993319cfba4c7a72e639de57d7407094b9ddf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.07685",
    "kind": "arxiv",
    "version": 2
  }
}