Pith Number

pith:FI4V2YUZ

pith:2004:FI4V2YUZCLUGCPMJ3HM676V3FV

not attested not anchored not stored refs pending

On possible skewon effects on light propagation

Friedrich W. Hehl, Yuri N. Obukhov

arxiv:physics/0409155 v2 · 2004-09-29 · physics.class-ph · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FI4V2YUZCLUGCPMJ3HM676V3FV}

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

3 papers in Pith

The G\"odel Universe as a Superconductor

Crystallography, Lorentz violation, and the Standard-Model Extension

Receipt and verification

First computed	2026-07-04T15:31:51.017907Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2a395d629912e8613d89d9d9effabb2d764fd25c8d33c372ced607cc65dbf3a9

Aliases

arxiv: physics/0409155 · arxiv_version: physics/0409155v2 · doi: 10.48550/arxiv.physics/0409155 · pith_short_12: FI4V2YUZCLUG · pith_short_16: FI4V2YUZCLUGCPMJ · pith_short_8: FI4V2YUZ

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/FI4V2YUZCLUGCPMJ3HM676V3FV \
  | 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: 2a395d629912e8613d89d9d9effabb2d764fd25c8d33c372ced607cc65dbf3a9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "844de23debaf64a2f25e8d282e49a0d258071690dcb48686c0e050cfba5bbfb4",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.class-ph",
    "submitted_at": "2004-09-29T15:49:22Z",
    "title_canon_sha256": "e56c80ff92cf4f1524f2e8883caa8cac1c7be42f2d54c747328313c1de185547"
  },
  "schema_version": "1.0",
  "source": {
    "id": "physics/0409155",
    "kind": "arxiv",
    "version": 2
  }
}