{"total":13,"items":[{"citing_arxiv_id":"2605.04147","ref_index":66,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Unifying the Regge-Wheeler-Zerilli and Bardeen-Press-Teukolsky formalisms on spherical backgrounds","primary_cat":"gr-qc","submitted_at":"2026-05-05T18:00:02+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"A self-dual curvature formulation unifies the Regge-Wheeler-Zerilli and Bardeen-Press-Teukolsky equations on spherical backgrounds as components of one tensorial curvature equation.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"commenting on some technical complications that can arise in the time domain. Several directions for future work remain to be explored, where this approach may prove useful. QNM isospectrality is in general broken when GR is extended, either through the inclusion of matter fields or higher-curvature corrections [61-63]. However, for certain well-motivated completions, such as supergravity [64, 65] or type II string theory [66], it is preserved. The present framework may provide a simple setting in which to further investigate the mechanisms underlying isospectrality breaking and preservation. Another natural direction concerns the role of gravitational nonlinearities in the ring- down phase. These effects have recently been observed in numerical simulations [67-69], and there are prospects for their detection with future [70, 71] and, perhaps, even cur-"},{"citing_arxiv_id":"2605.03576","ref_index":23,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Ringdown Analysis of GW250114 with Orthonormal Modes","primary_cat":"gr-qc","submitted_at":"2026-05-05T09:45:08+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Orthonormal QNM analysis of GW250114 raises the significance of the first overtone of the ℓ=m=2 mode from 82.5% to 99.9% and detects no significant deviation from Kerr predictions.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"[21] Sizheng Ma and Huan Yang, \"Excitation of quadratic quasinormal modes for Kerr black holes,\" Phys. Rev. D 109, 104070 (2024), arXiv:2401.15516 [gr-qc]. 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Pook-"},{"citing_arxiv_id":"2603.07469","ref_index":10,"ref_count":2,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Can Oscillatory and Persistent Nonlinearities Be Bridged in Black Hole Ringdown?","primary_cat":"gr-qc","submitted_at":"2026-03-08T05:11:47+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Quadratic quasinormal modes and the memory effect in black hole ringdown are related through bridge coefficients that depend primarily on remnant black hole parameters.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2601.23019","ref_index":174,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Toward claiming a detection of gravitational memory","primary_cat":"gr-qc","submitted_at":"2026-01-30T14:27:25+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"A framework using scale separation in the Isaacson description defines observable gravitational memory rise for compact binary coalescences, providing a basis for hypothesis testing in LISA data.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2601.16016","ref_index":34,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Nonlinear tails of massive scalar fields around a black hole","primary_cat":"gr-qc","submitted_at":"2026-01-22T14:41:06+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Nonlinear tails of massive scalar fields around black holes decay at the same rate as linear tails during intermediate times, independent of sources or initial conditions.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2511.08692","ref_index":79,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Excitation factors for horizonless compact objects: long-lived modes, echoes, and greybody factors","primary_cat":"gr-qc","submitted_at":"2025-11-11T19:00:08+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Excitation factors of long-lived quasinormal modes in horizonless compact objects scale with their small imaginary frequency, suppressing early contributions and producing a hierarchy where prompt ringdown uses ordinary modes and late echoes use cavity modes.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"D103, 104018 (2021), arXiv:2010.00162 [gr- qc]. [76] N. Loutrel, J. L. Ripley, E. Giorgi, and F. Pretorius, Phys. Rev. D103, 104017 (2021), arXiv:2008.11770 [gr- qc]. [77] L. Sberna, P. Bosch, W. E. East, S. R. Green, and L. Lehner, Phys. Rev. D105, 064046 (2022), arXiv:2112.11168 [gr-qc]. [78] M. H.-Y. Cheunget al., Phys. Rev. Lett.130, 081401 (2023), arXiv:2208.07374 [gr-qc]. [79] K. Mitmanet al., Phys. Rev. Lett.130, 081402 (2023), arXiv:2208.07380 [gr-qc]. [80] A. Kehagias, D. Perrone, A. Riotto, and F. Riva, Phys. Rev. D108, L021501 (2023), arXiv:2301.09345 [gr-qc]. [81] D. Perrone, T. Barreira, A. Kehagias, and A. Riotto, Nucl. Phys. B999, 116432 (2024), arXiv:2308.15886 [gr- qc]. [82] M. H.-Y. Cheung, E. Berti, V. Baibhav, and"},{"citing_arxiv_id":"2510.17954","ref_index":8,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Green function of the P\\\"{o}schl-Teller potential","primary_cat":"gr-qc","submitted_at":"2025-10-20T18:00:00+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Exact time-domain Green function computed for the Pöschl-Teller approximation to black-hole perturbation potentials, revealing additional early-time exponentially growing modes and a light-cone plus historical waveform decomposition.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2509.08099","ref_index":97,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Black Hole Spectroscopy and Tests of General Relativity with GW250114","primary_cat":"gr-qc","submitted_at":"2025-09-09T19:17:32+00:00","verdict":"ACCEPT","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"GW250114 data confirm the remnant is consistent with a Kerr black hole and bound the dominant quadrupolar mode frequency to within a few percent of the GR prediction, with constraints tighter than prior multi-event catalogs.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Kerr remnant with redshifted massM f (1+z ), wherezis the cosmological redshift, and dimensionless spinχ f [51-53]. While the prompt response [65, 88, 89], dynamical ef- fects [90-92], higher-order perturbative terms [93-96], and nonlinearities [51] are expected to contribute to the early post- merger signal, they are subdominant to the QNMs at suffi- ciently late times [97, 98]. Gravitational-wave tails [63, 64, 0.0 0.5 1.0 Amost damped [ 10□20] Agnostic 2DS 0 2 4 6 8 10 12 14 t> = t □ tpeak [tMf ] 0 1 A221 [ 10□20] 220+221 220+221+222 0 1 2 3 4 5 t> = t □ tpeak [ms] FIG. 1. Consistency of post-merger data with two QNMs.Top:The inferred amplitude of the most rapidly decaying damped sinusoid for the 2DS model at different fit times as measured byringdown."},{"citing_arxiv_id":"2509.08054","ref_index":97,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"GW250114: testing Hawking's area law and the Kerr nature of black holes","primary_cat":"gr-qc","submitted_at":"2025-09-09T18:00:07+00:00","verdict":"ACCEPT","verdict_confidence":"MODERATE","novelty_score":5.0,"formal_verification":"none","one_line_summary":"GW250114 data confirm the remnant black hole ringdown frequencies lie within 30% of Kerr predictions and that the final horizon area is larger than the sum of the progenitors' areas to high credibility.","context_count":1,"top_context_role":"method","top_context_polarity":"use_method","context_text":"tectors [2] were operating nominally, Virgo [77] was under- going routine maintenance, and KAGRA [78] was not tak- ing data. No significant data-quality issues were identified at the time [79]. GW250114 was detected with high sig- nificance by all search pipelines operating at the time; Gst- LAL [80-91], MLy[92], SPIIR [93], MBTA [94, 95], Py- CBC [96], andcWB [97, 98], with a network matched-filter signal-to-noise ratio, henceforth SNR, [99, 100] ranging be- tween 77 and 80. This is the highest reported SNR to date, surpassing GW230814 230901 which had SNR 42 [18, 101]. GW250114's record extends to the individual detectors, with SNRs of 53 and 60 at LIGO Hanford and LIGO Livingston respectively. The combination of the two LIGO detectors at"},{"citing_arxiv_id":"2501.16433","ref_index":82,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Greybody factors, reflectionless scattering modes, and echoes of ultracompact horizonless objects","primary_cat":"gr-qc","submitted_at":"2025-01-27T19:00:06+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"High-frequency quasi-reflectionless scattering modes in the greybody factors of ultracompact horizonless objects are responsible for echoes in the time-domain response.","context_count":1,"top_context_role":"baseline","top_context_polarity":"unclear","context_text":"Pere˜ niguez, and V. Cardoso, Phys. Rev. D 109, 044048 (2024), arXiv:2312.04633 [gr- qc]. [80] J. Redondo-Yuste, G. Carullo, J. L. Ripley, E. Berti, and V. Cardoso, Phys. Rev. D 109, L101503 (2024), arXiv:2308.14796 [gr-qc]. [81] S. Yi, A. Kuntz, E. Barausse, E. Berti, M. H.- Y. 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