Pith Number

pith:2SEY32WP

pith:2025:2SEY32WPEFQT7MLLEUBETFYYOM

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Modeling the frequency-domain ringdown amplitude of comparable-mass mergers with greybody factors

Emanuele Berti, Paolo Pani, Romeo Felice Rosato, Sophia Yi

A four-parameter greybody model reproduces the frequency-domain ringdown amplitude of comparable-mass aligned-spin mergers with mismatches around 10^{-5}.

arxiv:2512.15877 v2 · 2025-12-17 · gr-qc · astro-ph.HE · hep-ph

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Claims

C1strongest claim

a simple four-parameter model based on the greybody factor accurately reproduces the frequency-domain amplitude of a large set of comparable-mass, aligned-spin numerical relativity waveforms from the SXS catalog, achieving mismatches of order O(10^{-5}) and improving existing models by roughly two orders of magnitude

C2weakest assumption

That the greybody factor of the remnant black hole modulates the post-merger ringdown signal in a manner that a simple four-parameter model can capture accurately for comparable-mass aligned-spin mergers across the SXS catalog.

C3one line summary

A four-parameter greybody factor model reproduces the frequency-domain ringdown amplitude of comparable-mass aligned-spin mergers with mismatches of order 10^{-5}, improving existing models by two orders of magnitude.

References

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[1] The top-left panel of Fig

[2] Using these values, we compute the corresponding reflectivity Rℓm(¯ω,χ)and construct the reduced spectrum Yℓm(ω) = Hℓm(ω)√ Rℓm(¯ω,χ)

[3] Since the minimum frequency of validity of the model is not known a priori, we consider a set of starting frequencies ¯ωi such that ¯ωi∈[0,¯ωcut]

[4] Within the validity region of the model, the values ofAℓmandpℓmobtained from different¯ωi are expected to be consistent within their uncertainties

[5] Finally, we compare the fitted model with the data. In the top-left panel of Fig. 2, the dashed pink line shows the best-fit model for the simulation SXS:BBH:3982, while the solid black line corre- sp

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2 papers in Pith

Quasinormal mode/grey-body factor correspondence for Kerr black holes

Novel ringdown tests of general relativity with black hole greybody factors

Receipt and verification

First computed	2026-05-18T02:44:32.150471Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d4898deacf21613fb16b2502499718730956b9a8b4c7667d16ef79be491fb836

Aliases

arxiv: 2512.15877 · arxiv_version: 2512.15877v2 · doi: 10.48550/arxiv.2512.15877 · pith_short_12: 2SEY32WPEFQT · pith_short_16: 2SEY32WPEFQT7MLL · pith_short_8: 2SEY32WP

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curl -sH 'Accept: application/ld+json' https://pith.science/pith/2SEY32WPEFQT7MLLEUBETFYYOM \
  | 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: d4898deacf21613fb16b2502499718730956b9a8b4c7667d16ef79be491fb836

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "799b3f116ab05d1f4642bf30400ce717adfd59b7e8f01bb1e3e20becbf7ebd5d",
    "cross_cats_sorted": [
      "astro-ph.HE",
      "hep-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2025-12-17T19:00:11Z",
    "title_canon_sha256": "36d8950b4a6ade790fb0bb5ab14efd122e31c471dd97e77eb9579f62de438e97"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2512.15877",
    "kind": "arxiv",
    "version": 2
  }
}