Pith Number

pith:D4CKDULL

pith:2019:D4CKDULLFXKKT5EUHTKZJMEJ7D

not attested not anchored not stored refs pending

Testing the $f(R)$-theory of gravity

Nguyen Anh Ky, Nguyen Thi Hong Van, Pham Van Ky

arxiv:1904.04013 v1 · 2019-03-12 · physics.gen-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{D4CKDULLFXKKT5EUHTKZJMEJ7D}

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.

Cited by

1 paper in Pith

Nonstatic Reissner-Nordstr\"om metric in the perturbative $f(R)$ theory: Embedding in the background of the FLRW cosmology, uniqueness of solutions, the TOV equation

Receipt and verification

First computed	2026-07-05T01:11:08.944587Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1f04a1d16b2dd4a9f4943cd594b089f8fd067f65d4599d8a7f9b568365aa76cc

Aliases

arxiv: 1904.04013 · arxiv_version: 1904.04013v1 · doi: 10.48550/arxiv.1904.04013 · pith_short_12: D4CKDULLFXKK · pith_short_16: D4CKDULLFXKKT5EU · pith_short_8: D4CKDULL

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/D4CKDULLFXKKT5EUHTKZJMEJ7D \
  | 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: 1f04a1d16b2dd4a9f4943cd594b089f8fd067f65d4599d8a7f9b568365aa76cc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e1fbb099a54c601435e4d7abbf078e358b66bb5f50199edacc56bf26f1d727e2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.gen-ph",
    "submitted_at": "2019-03-12T12:17:01Z",
    "title_canon_sha256": "eb3bf10a6c16cc670bd789d5441f2f30c017febe99e71e8b20006a7eb74237f1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.04013",
    "kind": "arxiv",
    "version": 1
  }
}