{"total":34,"items":[{"citing_arxiv_id":"2605.22696","ref_index":98,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Dimming of Photon Ring due to Photon-Axion Conversion around Kerr Black Holes","primary_cat":"gr-qc","submitted_at":"2026-05-21T16:38:45+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Photon-axion conversion near Kerr black holes produces dimming of photon spectral luminosity that increases with black hole spin, magnetic field strength, and photon-axion coupling, most efficiently at high frequencies.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2605.19731","ref_index":56,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Neutron stars more compact than black holes in quasi-topological gravity: Equilibrium configurations and radial stability","primary_cat":"gr-qc","submitted_at":"2026-05-19T12:05:32+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"In quasi-topological gravity, neutron stars can surpass black-hole compactness with universal high-density behavior and theory corrections that stabilize radially unstable configurations from general relativity.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2605.09426","ref_index":64,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Resonant transmission of scalar waves through rotating traversable wormhole","primary_cat":"gr-qc","submitted_at":"2026-05-10T08:56:51+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Rotation enhances Breit-Wigner resonances in scalar wave transmission through Teo wormholes by trapping modes in the throat potential well.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"versibly lost behind a horizon, unlike in a BH spacetime [63]. Instead, the wave can propagate through the throat and emerge into the other asymptotic region [49]. The incident wave will be partly reflected and partly trans- mitted at the throat without any amplification. Nev- ertheless, in this scenario, one can suitably define the greybody factor, accounting for the transmission of the matter field [64], to study the scattering phenomena, as Γωlm = 1− Rωlm Iωlm 2 = |Tωlm|2 |Iωlm|2 .(15) Therefore, the graybody factor represents the probability that an incident wave will successfully cross the potential barrier and through the throat of a WH. In what follows, we will outline the procedure for computing the reflec- tion and transmission coefficients numerically, which will"},{"citing_arxiv_id":"2605.03756","ref_index":12,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Resonances as signatures of scalar clouds in eccentric extreme-mass-ratio inspirals","primary_cat":"gr-qc","submitted_at":"2026-05-05T13:41:07+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"Eccentricity in EMRIs around scalar clouds produces relativistic resonances in scalar fluxes near the last stable orbit, leading to observable dephasing in gravitational waveforms.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"into a massive black hole (MBH), accumulating tens to hundreds of thousands of cycles in the strong-field regime. This makes them unparalleled probes of MBH spacetimes and their astrophysical environments [8-11]. A compelling scenario is the presence of an ultralight bosonic cloud around the primary black hole (BH), formed via superradiant instabilities [12]. Such environments can leave a detectable imprint on the GW signal emitted by an EMRI [13, 14], potentially revealing the existence of new fundamental bosons. Environmental effects of boson clouds in EMRIs have been extensively studied using Newtonian approximations [15-20], which are insuf- ficient to capture the dynamics in the late inspiral phase,"},{"citing_arxiv_id":"2604.22734","ref_index":16,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Radiation outer boundary conditions and near-to-far field signal transformations for the Bardeen-Press equation","primary_cat":"gr-qc","submitted_at":"2026-04-24T17:29:36+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"Exact transparent radiation boundary conditions and near-to-far field teleportation kernels are derived for the Bardeen-Press equation, approximated via exponential sums with error bounds, and shown to eliminate late-time artifacts in time-domain solvers.","context_count":1,"top_context_role":"method","top_context_polarity":"use_method","context_text":"Figure 4.3 shows a Xu-Jiang binary tree adapted to the profiles forbω2(iy, 60), with ymax = 0.25corresponding to the plots in Figure 4.1. The figure showsNint = 10subintervals and the profiles are uniformly smooth on each 10 one. By \"smooth\" we mean that Cheyshev-polynomial expansions of the profiles on each subinterval obey a convergence criterion; see [16] for details. The resulting adaptive grid{yj}2QNint j=0 and corresponding trapezoidal integration weights{µ j}2QNint j=0 then define the minimization problem argmin {βq,γq}d q=1 2QNintX j=0 µj bωℓ(iyj, ρb)− dX k=1 γk iyj −β k 2 ,(4.6) where thebωℓ(iyj, ρb)here is really our numerical evaluation atyj of the true kernel. In practice, the numberd of poles is increased until the set{βq, γq}d"},{"citing_arxiv_id":"2604.21239","ref_index":18,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Relativistic frequency shifts in gravitational waves from axion clouds","primary_cat":"gr-qc","submitted_at":"2026-04-23T03:15:30+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"A unified relativistic framework using bilinear perturbation theory calculates frequency shifts in GWs from axion clouds, handling self-interactions and multiple superradiant modes for the first time.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"peatedly extracts energy and angular momentum, and a macroscopic condensate forms around the BH. The in- stability is most efficient when the Compton wavelength is comparable to the BH radius, corresponding to bo- son masses in the range 10−20-10−10 eV for astrophysical BHs. The presence of such a cloud can produce a vari- ety of observational signatures [17], including BH spin- down [18, 19], impacts on GWs from binaries [20-23], effects on the BH shadow [24-26], and a stochastic GW background [27-29]. As present and future GW detectors continue to im- prove in sensitivity, GWs emitted from boson clouds are becoming an increasingly important target [30-37]. GWs from boson clouds can be broadly divided into two classes: continuous signals emitted spontaneously over"},{"citing_arxiv_id":"2604.21010","ref_index":64,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Gravity Echoes from Supermassive Black Hole Binaries","primary_cat":"astro-ph.HE","submitted_at":"2026-04-22T19:00:04+00:00","verdict":"UNVERDICTED","verdict_confidence":"UNKNOWN","novelty_score":8.0,"formal_verification":"none","one_line_summary":"Future microhertz detections combined with nanohertz pulsar terms can serve as gravity echoes to measure supermassive black hole binary inspiral rates from hundreds to thousands of years in the past.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"906 (Springer, 2015) arXiv:1501.06570 [gr-qc]. [62] D. Baumann, H. S. Chia, and R. A. Porto, Probing ul- tralight bosons with binary black holes, Phys. Rev. D99, 044001 (2019), arXiv:1804.03208 [gr-qc]. [63] P. Gondolo and J. Silk, Dark Matter Annihilation at the Galactic Center, Phys. Rev. Lett.83, 1719 (1999), arXiv:astro-ph/9906391 [astro-ph]. [64] G. Alonso-Álvarez, J. M. Cline, and C. Dewar, Self- Interacting Dark Matter Solves the Final Parsec Problem of Supermassive Black Hole Mergers, Phys. Rev. Lett. 133, 021401 (2024), arXiv:2401.14450 [astro-ph.CO]. [65] P. C. Peters, Gravitational Radiation and the Motion of Two Point Masses, Physical Review136, B1224 (1964). [66] D. J. D'Orazio and P."},{"citing_arxiv_id":"2604.20656","ref_index":9,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Time evolution of a Nambu-Goto string coiling around a Kerr black hole","primary_cat":"gr-qc","submitted_at":"2026-04-22T15:06:29+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Time-dependent evolution of a non-rigid Nambu-Goto string around a Kerr black hole produces short-lived energy extraction followed by a propagating wave and approach to a known static configuration, with total extracted energy bounded by μM.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2604.15240","ref_index":104,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Boson star-black hole binaries: initial data and head-on collisions","primary_cat":"gr-qc","submitted_at":"2026-04-16T17:15:14+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"A one-body conformal-factor correction stabilizes boson star-black hole initial data, enabling gravitational-wave analysis that shows higher multipoles can discriminate mixed mergers from pure black-hole binaries.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"hole superradiance through repeated particle produc- tion on bound orbits,\" Phys. Rev. D112, 104066 (2025), arXiv:2507.03490 [gr-qc]. [103] Dina Traykova, Katy Clough, Thomas Helfer, Emanuele Berti, Pedro G. Ferreira, and Lam Hui, \"Dynam- ical friction from scalar dark matter in the rela- tivistic regime,\" Phys. Rev. D104, 103014 (2021), arXiv:2106.08280 [gr-qc]. [104] Alexis Boudon, Philippe Brax, and Patrick Valageas, \"Subsonic accretion and dynamical friction for a black hole moving through a self-interacting scalar dark matter cloud,\" Phys. Rev. D106, 043507 (2022), arXiv:2204.09401 [astro-ph.CO]. [105] Zhuan Ning, Qian Chen, Yu Tian, Xiaoning Wu, and Hongbao Zhang, \"Spontaneous deformation of an AdS spherical black hole,\" Phys."},{"citing_arxiv_id":"2604.11895","ref_index":114,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Novel ringdown tests of general relativity with black hole greybody factors","primary_cat":"gr-qc","submitted_at":"2026-04-13T18:00:07+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"GreyRing model based on greybody factors reproduces numerical relativity ringdown signals with mismatches of order 10^{-6} and enables a new post-merger consistency test of general relativity applied to GW250114.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"arXiv:1305.6759 [gr-qc]. [109] W. H. Press and S. A. Teukolsky, Nature238, 211 (1972). [110] W. H. Press and S. A. Teukolsky, Astrophys. J.185, 649 (1973). [111] S. A. Teukolsky and W. H. Press, Astrophys. J.193, 443 (1974). [112] A. A. Starobinskii, Sov. Phys. JETP37, 28 (1973). [113] A. A. Starobinskil and S. M. Churilov, Sov. Phys. JETP 65, 1 (1974). [114] R. Brito, V. Cardoso, and P. Pani, Lect. Notes Phys. 906, pp.1 (2015), arXiv:1501.06570 [gr-qc]. [115] A. Buonanno, G. B. Cook, and F. Pretorius, Phys. Rev. D75, 124018 (2007), arXiv:gr-qc/0610122. [116] E. Berti, V. Cardoso, J. A. Gonzalez, U. Sperhake, M. Hannam, S. Husa, and B. Bruegmann, Phys. Rev. D76, 064034 (2007), arXiv:gr-qc/0703053. [117] E."},{"citing_arxiv_id":"2604.11893","ref_index":71,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Relativistic signatures of scalar dark matter in extreme-mass-ratio inspirals","primary_cat":"gr-qc","submitted_at":"2026-04-13T18:00:05+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Relativistic metric backreaction from scalar dark matter clouds in EMRIs produces dominant polar gravitational wave corrections for Mμ ≲ 0.12, exceeding axial and scalar radiation channels at small separations.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Brito, Physical Review D111, 082010 (2025), arXiv:2410.17310 [gr-qc]. [68] D. Li, C. Weller, P. Bourg, M. LaHaye, N. Yunes, and H. Yang, Phys. Rev. D112, 084057 (2025), arXiv:2507.02045 [gr-qc]. [69] G. M. Tomaselli, Phys. Rev. D112, 063033 (2025), arXiv:2507.15110 [gr-qc]. [70] S. L. Detweiler, Physical Review D: Particles and Fields 22, 2323 (1980). [71] R. Brito, V. Cardoso, and P. Pani,Superradiance: New Frontiers in Black Hole Physics(Springer International Publishing, 2020) arXiv:1501.06570 [gr-qc]. [72] R. Brito, V. Cardoso, and P. Pani, Classical and Quan- tum Gravity32, 134001 (2015), arXiv:1411.0686 [gr-qc]. [73] S. R. Dolan, Physical Review D76, 084001 (2007), arXiv:0705.2880 [gr-qc]. [74] A."},{"citing_arxiv_id":"2604.08053","ref_index":47,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Constraining Ultralight Scalar Dark Matter in the Galactic Center with the S2 Orbit","primary_cat":"hep-ph","submitted_at":"2026-04-09T10:02:09+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Using S2 star periastron precession, the work constrains ultralight scalar dark matter mass ratios to below 10^{-3} or 1 and improves quadratic coupling bounds for masses 10^{-20} to 10^{-18} eV.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"D87, 043513 (2013). [45] R. Brito, V. Cardoso, and P. Pani, Black holes as particle detectors: evolution of superradiant instabilities, Class. Quant. Grav.32, 134001 (2015), arXiv:1411.0686 [gr-qc]. [46] R. Brito, V. Cardoso, and P. Pani, Superradiance: New Frontiers in Black Hole Physics, Lect. Notes Phys.906, pp.1 (2015), arXiv:1501.06570 [gr-qc]. [47] D. Baumann, H. S. Chia, and R. A. Porto, Probing Ul- tralight Bosons with Binary Black Holes, Phys. Rev. D 99, 044001 (2019), arXiv:1804.03208 [gr-qc]. [48] J. Zhang and H. Yang, Dynamic signatures of black hole binaries with superradiant clouds, Phys. Rev. D101, 043020 (2020). [49] D. Baumann, H. S. Chia, J. Stout, and L. ter Haar, The Spectra of Gravitational Atoms, JCAP12, 006,"},{"citing_arxiv_id":"2604.06249","ref_index":54,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Universal Ladder Structure Across Scales: From Quantum to Black Hole Physics","primary_cat":"gr-qc","submitted_at":"2026-04-06T18:29:56+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":4.0,"formal_verification":"none","one_line_summary":"A symmetry-based litmus test identifies when physical systems governed by second-order ODEs possess ladder structures and constructs them, linking supersymmetric quantum mechanics to Kerr black-hole tidal responses.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2604.04352","ref_index":30,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Superradiant Suppression of Non-minimally Coupled Scalar fields for a Rotating Charged dS Black Hole in Conformal Weyl Gravity","primary_cat":"hep-th","submitted_at":"2026-04-06T01:59:10+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Superradiant amplification of charged scalar fields around rotating charged de Sitter black holes is suppressed in conformal Weyl gravity relative to general relativity, with strong exponential suppression for massive fields in the cosmological region.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"the spacetime as well as on the underlying gravitational theory. In particular, black holes in asymptotically flat,de Sitter(dS), orAnti-de Sitter(AdS) backgrounds may exhibit qualitatively different superradiant behaviour because the horizon properties, boundary conditions, and effective trapping mechanisms are modified by the global geometry (the reader can consult the review [30] for a broad study of the vast literature in superradiance). Likewise, for black holes arising in theories beyond general relativity, the superradiant threshold can be altered by changes in the metric, additional charges or fields, nonminimal couplings, or modified horizon dynamics. As a result, superradiance provides a valuable probe of strong-gravity physics: its amplification conditions,"},{"citing_arxiv_id":"2604.01407","ref_index":15,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"High-frequency gravitational wave transients from superradiance","primary_cat":"gr-qc","submitted_at":"2026-04-01T21:14:58+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Ultralight boson clouds around primordial black holes emit high-frequency gravitational wave transients via superradiance and binary-driven transitions, but the signals fall below current detector sensitivity at plausible distances.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"The GW frequency is set almost entirely byµ: annihilation of two cloud bosons into a graviton emits atω ann ≃2µ, while level transitions between states with principal quantum numbersn g andn e emit at the Bohr frequencyω tr ∝µα 2(n−2 g −n −2 e ). For stellar-mass BHs this places signals in the audio band probed by LIGO/Virgo/KAGRA, and an extensive literature has explored these GW signatures and the spin constraints they imply [15, 16, 18, 19]. A qualitatively distinct regime arises forprimordial black holes(PBHs) [20-22]. For sub- solar mass PBH masses the superradiance condition selects boson massesµ∼10−7-10−5eV, driving GW emission into the MHz-GHz band. This is precisely the frequency range targeted by resonant-cavity haloscopes such as ADMX, which were originally designed to search for"},{"citing_arxiv_id":"2602.00518","ref_index":58,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Charged Superradiant Instability of Spherically Symmetric Regular Black Holes in de Sitter Spacetime: Time- and Frequency-Domain Analysis","primary_cat":"gr-qc","submitted_at":"2026-01-31T05:18:53+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"ABG-dS black holes show charged superradiant instability exclusively for the spherically symmetric ℓ=0 mode, with growth rates that peak at intermediate Λ and q and rise with Q, differing from RN-dS due to nonlinear electrodynamics.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2601.18613","ref_index":18,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Correspondence between quasinormal modes and grey-body factors of Schwarzschild--Tangherlini black holes","primary_cat":"gr-qc","submitted_at":"2026-01-26T15:53:33+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Quasinormal modes correspond well to grey-body factors for vector and tensor perturbations of Schwarzschild-Tangherlini black holes in all dimensions, but fail for scalar l=2 modes in D≥7 because of multiple potential barriers.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2512.23510","ref_index":72,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Quasinormal mode/grey-body factor correspondence for Kerr black holes","primary_cat":"gr-qc","submitted_at":"2025-12-29T14:47:19+00:00","verdict":"CONDITIONAL","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"WKB analysis of the Teukolsky equation establishes a quasinormal-mode to greybody-factor correspondence for Kerr black holes that holds in the eikonal limit for gravitational perturbations and matches numerics at high angular momentum.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2512.13816","ref_index":28,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Stellar Superradiance and Low-Energy Absorption in Dense Nuclear Media","primary_cat":"hep-ph","submitted_at":"2025-12-15T19:02:00+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Collective nucleon scattering in neutron-star matter suppresses the effective absorption of ultralight bosons at the long wavelengths relevant for superradiance, weakening the link between stellar cooling bounds and superradiant instability rates.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Detweiler,KLEIN-GORDON EQUATION AND ROTATING BLACK HOLES,Phys. Rev. D22(1980) 2323-2326. [26] V. Cardoso and S. Yoshida,Superradiant instabilities of rotating black branes and strings, JHEP07(2005) 009, [hep-th/0502206]. [27] S. R. Dolan,Instability of the massive Klein-Gordon field on the Kerr spacetime,Phys. Rev. D 76(2007) 084001, [0705.2880]. [28] R. Brito, V. Cardoso and P. Pani,Superradiance: New Frontiers in Black Hole Physics,Lect. Notes Phys.906(2015) pp.1-237, [1501.06570]. [29] S. Bao, Q. Xu and H. Zhang,Improved analytic solution of black hole superradiance,Phys. Rev. D106(2022) 064016, [2201.10941]. [30] A. Arvanitaki and S. Dubovsky,Exploring the String Axiverse with Precision Black Hole"},{"citing_arxiv_id":"2512.08598","ref_index":37,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Horizon brightened acceleration radiation from massive vector fields","primary_cat":"gr-qc","submitted_at":"2025-12-09T13:36:27+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"Acceleration radiation for massive vector fields near black hole horizons has a universal thermal detailed-balance factor from the Rindler transformation, with mass thresholds and polarization-dependent spectra, yielding an entropy flux relation identical in form to the scalar HBAR case.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2511.16244","ref_index":27,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Constraining interacting dark energy models with black hole superradiance","primary_cat":"astro-ph.CO","submitted_at":"2025-11-20T11:24:10+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"Black hole superradiance constrains the coupling strength in interacting dark energy-dark matter models through modifications to the effective mass of ultralight bosons in two scenarios.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2511.10307","ref_index":61,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Gravitational Atoms from Topological Stars","primary_cat":"gr-qc","submitted_at":"2025-11-13T13:45:19+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Bound states of a massive scalar field around topological stars form strictly normal modes, producing a hydrogen-like spectrum when the Compton wavelength exceeds the star size and localized states otherwise.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2511.08692","ref_index":126,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"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":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2510.27424","ref_index":36,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Extracting Properties of Dark Dense Environments around Black Holes from Gravitational Waves","primary_cat":"gr-qc","submitted_at":"2025-10-31T12:24:32+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"A novel quantity derived from GW signals encodes the density profile of dark dense environments around black holes, allowing characterization of the condensate type and DM properties via multi-wavelength observations.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2510.17967","ref_index":58,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Scalar fields around black hole binaries in LIGO-Virgo-KAGRA","primary_cat":"gr-qc","submitted_at":"2025-10-20T18:00:02+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Semi-analytic waveform model for scalar environments around black hole binaries is validated against numerical relativity and applied to LIGO-Virgo-KAGRA data to obtain upper limits on scalar densities with tentative evidence in GW190728.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"to test the density of dark matter (DM) on small scales and potentially constrain its microphysics [14-45]. If DM interacts only gravitationally, GW observations may be the only channel through which we can test its nature. Light bosons, well-motivated as DM candidates [46-49], can form dense configurations around BHs through several mechanisms, such as superradiance [50-57] (see [58] for a review), dynamical capture via self-interactions [59, 60], binary-induced bound states [61-64], and accretion-driven spikes [65-68]. Superradiant clouds can have up to10% of the BH mass [57, 69], reaching average densities above 109 g cm−3 around stellar-mass BHs-over 30 orders of magnitude above the galactic DM background. Such densities lie well within the reach of LIGO-Virgo-KAGRA"},{"citing_arxiv_id":"2509.25305","ref_index":89,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"$\\phi$-Dwarfs: White Dwarfs probe Quadratically Coupled Scalars","primary_cat":"hep-ph","submitted_at":"2025-09-29T18:00:00+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"White dwarf mass-radius data exclude large parameter space for ultralight scalars quadratically coupled to fermions by predicting forbidden radius gaps and mass shifts toward the Chandrasekhar limit or altered maximum masses.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Geometries,Lett. Nuovo Cim.15(1976) 257-262. [87] S. L. Detweiler,Resonant oscillations of a rapidly rotating black hole,Proc. Roy. Soc. Lond. A352(1977) 381-395. [88] V. Cardoso, O. J. C. Dias, J. P. S. Lemos, and S. 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Chatterjee and I."},{"citing_arxiv_id":"2509.19451","ref_index":14,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Total absorption of tailored incoming signals by black holes","primary_cat":"gr-qc","submitted_at":"2025-09-23T18:06:05+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"Tailored temporal modulation of incoming signals enables complete absorption by black holes via excitation of complex-plane resonances, storing energy for later release through virtual absorption modes.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2509.17059","ref_index":156,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Axions as Dark Matter, Dark Energy, and Dark Radiation","primary_cat":"hep-ph","submitted_at":"2025-09-21T12:36:53+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":2.0,"formal_verification":"none","one_line_summary":"A mini-review of axion phenomenology showing how light bosons can account for dark matter, drive cosmic acceleration, or contribute to relativistic backgrounds in the early and late Universe.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"05681]. [153] V. Poulin, T.L. Smith, D. Grin, T. Karwal and M. Kamionkowski,Cosmological implications of ultralight axionlike fields,Phys. Rev. D98(2018) 083525 [1806.10608]. [154] L. Hui,Wave Dark Matter,Ann. Rev. Astron. Astrophys.59(2021) 247 [2101.11735]. [155] E.G.M. Ferreira,Ultra-light dark matter,Astron. Astrophys. Rev.29(2021) 7 [2005.03254]. [156] A.D. Linde,Axions in inflationary cosmology,Phys. Lett. B259(1991) 38. [157] D. Seckel and M.S. Turner,Isothermal Density Perturbations in an Axion Dominated Inflationary Universe,Phys. Rev. D32(1985) 3178. [158] M. Kawasaki and K. Nakayama,Axions: Theory and Cosmological Role,Ann. Rev. Nucl. Part. Sci.63(2013) 69 [1301.1123]. [159] H. Yoshino and H."},{"citing_arxiv_id":"2509.03568","ref_index":18,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Probing dense environments around Sgr A* with S-stars dynamics","primary_cat":"astro-ph.GA","submitted_at":"2025-09-03T18:00:00+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Models apsidal precession and dynamical friction from extended matter to extend GRAVITY constraints on boson clouds around Sgr A* and assess impacts on S-star orbits.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2505.23895","ref_index":178,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Black hole spectroscopy: from theory to experiment","primary_cat":"gr-qc","submitted_at":"2025-05-29T18:00:01+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":2.0,"formal_verification":"none","one_line_summary":"A review summarizing the state of the art in black hole quasinormal modes, ringdown waveform modeling, current LIGO-Virgo-KAGRA observations, and prospects for LISA and next-generation detectors.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"and may have relevance in the context of dark matter searches. In particular, bosonic condensates [169, 170] may grow due to superradiant instabilities [162, 171-175] and emit GWs through various channels - e.g., direct continuous emission arising from annihilation of the boson field, or level transitions between states with different overtone numbers [176-178]. Such processes (superradiant instabilities and GW emission) will change both the mass and the spin of the BH, drawing paths in the parameter space (as in the left panel of Fig. 2.10) that might encompass an exceptional point. 2.3.3. Exceptional points As seen above, QNMs of BHs demonstrate the occurrence of mode avoidance and associated resonances."},{"citing_arxiv_id":"2505.01649","ref_index":26,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Black Hole Solutions in Dark Photon Models with Higher Order Corrections","primary_cat":"gr-qc","submitted_at":"2025-05-03T01:54:59+00:00","verdict":"CONDITIONAL","verdict_confidence":"MODERATE","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Analytic perturbative black hole solutions in dark photon models with minimal and higher-order magnetic dipole corrections to the Schwarzschild geometry.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2305.15473","ref_index":121,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Worldline effective field theory of inspiralling black hole binaries in presence of dark photon and axionic dark matter","primary_cat":"hep-th","submitted_at":"2023-05-24T18:00:04+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Computes 1PN conservative dynamics for gravitational/EM/Proca fields and 2PN for scalar, plus radiation effects from axion-photon coupling at high PN orders in binary black hole systems with dark matter.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"03149]. [119] T. Ishii, Y. Kaku and K. Murata,Energy extraction from AdS black holes via superradiance, JHEP 10 (2022) 024 [2207.03123]. [120] V. Cardoso, O. J. C. Dias, G. S. Hartnett, M. Middleton, P. Pani and J. E. Santos, Constraining the mass of dark photons and axion-like particles through black-hole superradiance, JCAP03 (2018) 043 [1801.01420]. [121] R. Brito, V. Cardoso and P. Pani,Superradiance: New Frontiers in Black Hole Physics, Lect. Notes Phys.906 (2015) pp.1-237 [1501.06570]. [122] D. K. Ghosh, A. Ghoshal and S. Jeesun,Axion-like particle (ALP) portal freeze-in dark matter confronting ALP search experiments, 2305.09188. [123] C. T. Hill,Axion Induced Oscillating Electric Dipole Moment of the Electron, Phys."},{"citing_arxiv_id":"1904.05363","ref_index":92,"ref_count":1,"confidence":0.9,"is_internal_anchor":true,"paper_title":"Testing the nature of dark compact objects: a status report","primary_cat":"gr-qc","submitted_at":"2019-04-10T18:00:05+00:00","verdict":"ACCEPT","verdict_confidence":"MODERATE","novelty_score":2.0,"formal_verification":"none","one_line_summary":"Current and future observations can test whether dark compact objects are Kerr black holes or exotic alternatives, with null results strengthening the black hole paradigm.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"spacetime due to strong frame-dragging effects. Owing to this property, negative-energy (i.e., bound) states are possible within the ergoregion. This is the chief property that allows for energy and angular momentum extraction from a BH through various mechanisms, e.g. the Penrose's process, superradiant scattering, the Blandford-Znajek mechanism, etc. [92]. An ergoregion necessarily exists in the spacetime of a stationary and axisymmetric BH and the ergosurface must lay outside the horizon or coincide with it [92]. On the other hand, a spacetime with an ergoregion but without an event horizon is linearly unstable (see Sec. 4.3). 2.3.2 Multipolar structure As a by-product of the BH uniqueness and no-hair theorems [64, 93] (see also [5, 94, 95]),"},{"citing_arxiv_id":"1202.5809","ref_index":93,"ref_count":1,"confidence":0.98,"is_internal_anchor":true,"paper_title":"Dynamical Boson Stars","primary_cat":"gr-qc","submitted_at":"2012-02-27T00:47:39+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":2.0,"formal_verification":"none","one_line_summary":"Boson stars are particle-like solutions in general relativity that model dark matter, black hole mimickers, and binary systems.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"after a period of oscillation about an unstable boson star, the complex field collapses to a black hole. By tuning the initial perturbation, they find a longer and longer lived unstable boson star, which serves as the critical solution (see Fig. 17). The survival time τ obeys a power law in terms of the distance from criticality|p− p∗| τ∝ γ ln|p− p∗| , (93) where γ is a real constant that depends on the characteristic instability rate of the particular unstable boson star approached in the critical regime. Jimenez-Vazquez and Alcubierre (2022) subsequently studied the same sys- tem with different initial data. In particular, they adopted a Gaussian pulse as initial data, finding, as expected, that increasing the initial width of the pulse"}],"limit":50,"offset":0}