Pith Number

pith:NHIP24D7

pith:2025:NHIP24D7D7BDKJJZ27HRZNAHTD

not attested not anchored not stored refs resolved

Observational constraints on the spin/anisotropy of the CCOs of Cassiopeia A, Vela Jr. and G347.3-0.5 and a single surviving continuous gravitational wave candidate

Bernd Machenschalk, B. McGloughlin, B. Steltner, Heinz-Bernd Eggenstein, Jing Ming, J. Martins, Maria Alessandra Papa, M. Bensch, R. Prix, V. Dergachev

A deep volunteer search sets the tightest limits yet on neutron star ellipticity and crustal anisotropy in three supernova remnants, leaving one candidate signal.

arxiv:2512.15672 v3 · 2025-12-17 · gr-qc · hep-ph

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\usepackage{pith}
\pithnumber{NHIP24D7D7BDKJJZ27HRZNAHTD}

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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.

Claims

C1strongest claim

We set the most stringent constraints to date on the gravitational-wave amplitude, equatorial ellipticity, r-mode saturation amplitude, and -- for the first time -- the neutron-star crustal anisotropy.

C2weakest assumption

That any real continuous-wave signal from these sources would survive the multi-stage follow-up using O3b and O4a data without being rejected by the vetoes or statistical thresholds applied.

C3one line summary

New upper limits on gravitational-wave amplitude, ellipticity below 4e-7 for fast spins, and crustal anisotropy below 5e-3 for 1.3-100 ms periods from Cas A, Vela Jr., and G347.3-0.5, plus one surviving candidate.

References

3 extracted · 3 resolved · 1 Pith anchors

[1] " * write output.state after.block = add.period write newline

[2] write newline

[3] GWTC-4.0: Updating the Gravitational-Wave Transient Catalog with Observations from the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run 2017 · doi:10.1103/physrevd.70.082001

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-05-25T02:02:11.439583Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

69d0fd707f1fc2352539d7cf1cb40798d24826567021f20f4949e7a68402151b

Aliases

arxiv: 2512.15672 · arxiv_version: 2512.15672v3 · doi: 10.48550/arxiv.2512.15672 · pith_short_12: NHIP24D7D7BD · pith_short_16: NHIP24D7D7BDKJJZ · pith_short_8: NHIP24D7

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/NHIP24D7D7BDKJJZ27HRZNAHTD \
  | 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: 69d0fd707f1fc2352539d7cf1cb40798d24826567021f20f4949e7a68402151b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7bad89dec8213508c6f8985c2f4dcf35e9573fbed339194f99fe59628a8169d5",
    "cross_cats_sorted": [
      "hep-ph"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2025-12-17T18:24:20Z",
    "title_canon_sha256": "ee81ffe47cd5b72b6d1986c64250a7689e21a67400153013140cca5019b79f35"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2512.15672",
    "kind": "arxiv",
    "version": 3
  }
}