Pith Number

pith:UDB3EMXI

pith:2009:UDB3EMXIOMRP6ARNQM4STCLHQX

not attested not anchored not stored refs pending

Energy Conditions and Stability in $f(R)$ theories of gravity with non-minimal coupling to matter

Miguel Carvalho Sequeira, Orfeu Bertolami

arxiv:0903.4540 v2 · 2009-03-26 · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UDB3EMXIOMRP6ARNQM4STCLHQX}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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

2 papers in Pith

Cosmological and lunar laser ranging constraints on evolving dark energy in a nonminimally coupled curvature-matter gravity model

Energy conditions of bouncing solutions in quadratic curvature gravity coupled with a scalar field

Receipt and verification

First computed	2026-05-18T02:14:25.847647Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a0c3b232e87322ff022d833929896785cb9939cc8ade7a19b4a46acce6e71cb2

Aliases

arxiv: 0903.4540 · arxiv_version: 0903.4540v2 · doi: 10.48550/arxiv.0903.4540 · pith_short_12: UDB3EMXIOMRP · pith_short_16: UDB3EMXIOMRP6ARN · pith_short_8: UDB3EMXI

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/UDB3EMXIOMRP6ARNQM4STCLHQX \
  | 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: a0c3b232e87322ff022d833929896785cb9939cc8ade7a19b4a46acce6e71cb2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e88cb6cd1ebebe7f09c1ed05d34e9c133f50e52e02a561cbd3f4d005212bca76",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2009-03-26T09:59:03Z",
    "title_canon_sha256": "4ff496018012b4ab9525558a70dcd7a2d5913b5a99141fb20542800001300feb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.4540",
    "kind": "arxiv",
    "version": 2
  }
}