Pith Number

pith:SIVALQID

pith:2012:SIVALQID7HHMR7PV32S5UDX6VV

not attested not anchored not stored refs pending

Constraints on the primordial gravitational waves with variable sound speed from current CMB data

Cheng cheng, Qing-Guo Huang, Xiao-Dong Li, Yin-Zhe Ma

arxiv:1207.6113 v2 · 2012-07-25 · astro-ph.CO · 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{SIVALQID7HHMR7PV32S5UDX6VV}

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	2026-05-18T01:56:07.462135Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

922a05c103f9cec8fdf5dea5da0efead5e011847740b4764dfdf2e4410c28725

Aliases

arxiv: 1207.6113 · arxiv_version: 1207.6113v2 · doi: 10.48550/arxiv.1207.6113 · pith_short_12: SIVALQID7HHM · pith_short_16: SIVALQID7HHMR7PV · pith_short_8: SIVALQID

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/SIVALQID7HHMR7PV32S5UDX6VV \
  | 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: 922a05c103f9cec8fdf5dea5da0efead5e011847740b4764dfdf2e4410c28725

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "39744358564ee6239dd66285ff9f8390e723d1cb8ff680c8fbc4fe14f8ec245f",
    "cross_cats_sorted": [
      "hep-th"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-07-25T20:00:07Z",
    "title_canon_sha256": "d23646fa76782b103f9d98ab2fd4d0c94445c5dbdabc0f9ce55b240dd87a2733"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1207.6113",
    "kind": "arxiv",
    "version": 2
  }
}