Explanipedia

GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-spin Black Hole Coalescences Open

Adrian Abac, I. Abouelfettouh, F. Acernese, K. Ackley, Christian Adamcewicz , et al. · 2025

We report the observation of gravitational waves from two binary black hole coalescences during the fourth observing run of the LIGO–Virgo–KAGRA detector network, GW241011 and GW241110. The sources of these two signals are characterized by…

GW231123: A Binary Black Hole Merger with Total Mass 190–265 <i>M</i> <sub>⊙</sub> Open

Adrian Abac, I. Abouelfettouh, F. Acernese, K. Ackley, Christian Adamcewicz , et al. · 2025

On 2023 November 23, the two LIGO observatories both detected GW231123, a gravitational-wave signal consistent with the merger of two black holes with masses and (90% credible intervals), at a luminosity dis…

Late-Time Tails in Nonlinear Evolutions of Merging Black Holes Open

Marina de Amicis, Hannes R. Rüter, G. Carullo, Simone Albanesi, C. Melize Ferrus , et al. · 2025

We uncover late-time gravitational-wave tails in fully nonlinear 3+1 dimensional numerical relativity simulations of merging black holes, using the highly accurate p code. We achieve this result by exploiting the strong magnification of la…

Perturbative hyperboloidal extraction of gravitational waves in numerical relativity Open

Sebastiano Bernuzzi, Joan Fontbuté, Simone Albanesi, Anıl Zenginoğlu · 2025

We present a framework to propagate to null infinity gravitational waves computed at timelike world tubes in the interior of 3+1 (Cauchy) numerical relativity simulations. In our method, numerical relativity data are used as the inner infl…

Binary black hole merger in the extreme mass ratio limit: a multipolar analysis of the inclined orbit case Open

Luca Nagni, Alessandro Nagar, Rossella Gamba, Simone Albanesi, Sebastiano Bernuzzi · 2025

We compute the gravitational waveform emitted during the transition from quasi-spherical inspiral to plunge, merger and ringdown for a system of two black holes in the extreme mass ratio limit, where the primary is spinning and the seconda…

GW250114: Testing Hawking’s Area Law and the Kerr Nature of Black Holes Open

Adrian Abac, I. Abouelfettouh, F. Acernese, K. Ackley, Christian Adamcewicz , et al. · 2025

The gravitational-wave signal GW250114 was observed by the two LIGO detectors with a network matched-filter signal-to-noise ratio of 80. The signal was emitted by the coalescence of two black holes with near-equal masses m1=33.6−0.8+1.2M⊙ …

Perturbative Hyperboloidal Extraction of Gravitational Waves in 3+1 Numerical Relativity Open

Sebastiano Bernuzzi, Joan Fontbuté, Simone Albanesi, Anıl Zenginoğlu · 2025

We present a framework to propagate to null infinity gravitational waves computed at timelike worldtubes in the interior of a 3+1 (Cauchy) numerical relativity simulations. In our method, numerical relativity data are used as the inner inf…

Gravitational scattering of two neutron stars Open

Joan Fontbuté, Sebastiano Bernuzzi, P. Rettegno, Simone Albanesi, Wolfgang Tichy · 2025

We present the first numerical relativity simulations of the gravitational scattering of two neutron stars. Constraint-satisfying initial data for two equal-mass nonspinning sequences are constructed at fixed energy and various initial ang…

Real modes and null memory contributions in effective-one-body models Open

Simone Albanesi · 2025

We introduce a novel approach to describe real-valued m=0 modes from inspiral to merger and ringdown in effective-one-body models, including both oscillatory and null memory contributions. A crucial aspect of the modelization of the oscill…

Black hole spectroscopy: from theory to experiment Open

Emanuele Berti, Vítor Cardoso, G. Carullo, Jahed Abedi, Niayesh Afshordi , et al. · 2025

The "ringdown" radiation emitted by oscillating black holes has great scientific potential. By carefully predicting the frequencies and amplitudes of black hole quasinormal modes and comparing them with gravitational-wave data from compact…

Search for Gravitational Waves Emitted from SN 2023ixf Open

Adrian Abac, R. Abbott, I. Abouelfettouh, F. Acernese, K. Ackley , et al. · 2025

We present the results of a search for gravitational-wave transients associated with core-collapse supernova SN 2023ixf, which was observed in the galaxy Messier 101 via optical emission on 2023 May 19, during the LIGO–Virgo–KAGRA 15th Eng…

Effective-one-body modeling for generic compact binaries with arbitrary orbits Open

Simone Albanesi, Rossella Gamba, Sebastiano Bernuzzi, Joan Fontbuté, Alejandra Gonzalez , et al. · 2025

We present the first unified model for the general relativistic dynamics and gravitational radiation of generic compact binaries. TEOBResumS-Dalí is a model based on the effective-one-body framework incorporating tidal interactions, generi…

The Science of the Einstein Telescope Open

Adrian Abac, L. Raul Abramo, Simone Albanesi, Angelica Albertini, A. Agapito , et al. · 2025

Einstein Telescope (ET) is the European project for a gravitational-wave (GW) observatory of third-generation. In this paper we present a comprehensive discussion of its science objectives, providing state-of-the-art predictions for the ca…

Swift-BAT GUANO Follow-up of Gravitational-wave Triggers in the Third LIGO–Virgo–KAGRA Observing Run Open

Gayathri Raman, S. Ronchini, James DeLaunay, A. Tohuvavohu, J. A. Kennea , et al. · 2025

We present results from a search for X-ray/gamma-ray counterparts of gravitational-wave (GW) candidates from the third observing run (O3) of the LIGO–Virgo–KAGRA network using the Swift Burst Alert Telescope (Swift-BAT). The search include…

GR-Athena++: General-relativistic Magnetohydrodynamics Simulations of Neutron Star Spacetimes Open

William R. Cook, Boris Daszuta, Jacob Fields, Peter Hammond, Simone Albanesi , et al. · 2025

We present the extension of GR-Athena++ to general-relativistic magnetohydrodynamics (GRMHD) for applications to neutron star spacetimes. The new solver couples the constrained transport implementation of Athena++ to the Z4c formulation of…

Scattering and dynamical capture of two black holes: Synergies between numerical and analytical methods Open

Simone Albanesi, Alireza Rashti, Francesco Zappa, Rossella Gamba, William Cook , et al. · 2025

International audience

Late-time tails in nonlinear evolutions of merging black holes Open

Marina de Amicis, Hannes R. Rüter, G. Carullo, Simone Albanesi, C. Melize Ferrus , et al. · 2024

We uncover late-time gravitational-wave tails in fully nonlinear 3+1 dimensional numerical relativity simulations of merging black holes, using the highly accurate SpEC code. We achieve this result by exploiting the strong magnification of…

A Search Using GEO600 for Gravitational Waves Coincident with Fast Radio Bursts from SGR 1935+2154 Open

Adrian Abac, R. Abbott, I. Abouelfettouh, F. Acernese, K. Ackley , et al. · 2024

The magnetar SGR 1935+2154 is the only known Galactic source of fast radio bursts (FRBs). FRBs from SGR 1935+2154 were first detected by the Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB and the Survey for Transient Astronomic…

Direct current memory effects in effective-one-body waveform models Open

Elisa Grilli, A. Placidi, Simone Albanesi, G. Grignani, Marta Orselli · 2024

The direct current (DC) memory is a non-oscillatory, hereditary component of the gravitational wave (GW) signal that represents one of the most peculiar manifestations of the nonlinear nature of GW emission and propagation. In this work, b…

Inspiral-inherited ringdown tails Open

Marina De Amicis, Simone Albanesi, G. Carullo · 2024

We study the late-time relaxation of a perturbed Schwarzschild black hole, driven by a source term representing an infalling particle in generic orbits. We consider quasi-circular and eccentric binaries, dynamical captures and radial infal…

A Joint Fermi-GBM and Swift-BAT Analysis of Gravitational-wave Candidates from the Third Gravitational-wave Observing Run Open

C. Fletcher, J. Wood, R. Hamburg, P. Vereš, C. M. Hui , et al. · 2024

We present Fermi Gamma-ray Burst Monitor (Fermi-GBM) and Swift Burst Alert Telescope (Swift-BAT) searches for gamma-ray/X-ray counterparts to gravitational-wave (GW) candidate events identified during the third observing run of the Advance…

Bayesian real-time classification of multi-messenger electromagnetic and gravitational-wave observations Open

M. Berbel, M. Miravet-Tenés, Sushant Sharma Chaudhary, Simone Albanesi, M. Cavaglià , et al. · 2024

Because of the electromagnetic (EM) radiation produced during the merger, compact binary coalescences with neutron stars may result in multi-messenger observations. In order to follow up on the gravitational-wave (GW) signal with EM telesc…

GR-Athena++: General-relativistic magnetohydrodynamics simulations of neutron star spacetimes Open

William M. Cook, Boris Daszuta, Jacob Fields, Peter Hammond, Simone Albanesi , et al. · 2023

We present the extension of GR-Athena++ to general-relativistic magnetohydrodynamics (GRMHD) for applications to neutron star spacetimes. The new solver couples the constrained transport implementation of Athena++ to the Z4c formulation of…

Bayesian real-time classification of multi-messenger electromagnetic and gravitational-wave observations Open

M. Berbel, M. Miravet-Tenés, Sushant Sharma Chaudhary, Simone Albanesi, M. Cavaglià , et al. · 2023

Because of the electromagnetic radiation produced during the merger, compact binary coalescences with neutron stars may result in multi-messenger observations. In order to follow up on the gravitational-wave signal with electromagnetic tel…

Unveiling the merger structure of black hole binaries in generic planar orbits Open

G. Carullo, Simone Albanesi, Alessandro Nagar, Rossella Gamba, Sebastiano Bernuzzi , et al. · 2023

The precise modeling of binary black hole coalescences in generic planar orbits is a crucial step to disentangle dynamical and isolated binary formation channels through gravitational-wave observations. The merger regime of such coalescenc…

Towards numerical-relativity informed effective-one-body waveforms for dynamical capture black hole binaries Open

Tomás Andrade, J. Trenado, Simone Albanesi, Rossella Gamba, Sebastiano Bernuzzi , et al. · 2023

Dynamical captures of black holes may take place in dense stellar media due to the emission of gravitational radiation during a close passage. Detection of such events requires detailed modelling, since their phenomenology qualitatively di…

Faithful effective-one-body waveform of small-mass-ratio coalescing black hole binaries: the eccentric, nonspinning, case Open

Simone Albanesi, Sebastiano Bernuzzi, Thibault Damour, Alessandro Nagar, A. Placidi · 2023

We present a new effective-one-body (EOB) waveform for eccentric, nonspinning, binaries in the extreme mass ratio limit, with initial eccentricities up to $0.95$. The EOB analytical waveform, that includes noncircular corrections up to sec…

GW190521 as a dynamical capture of two nonspinning black holes Open

Rossella Gamba, M. Breschi, G. Carullo, P. Rettegno, Simone Albanesi , et al. · 2022

Data release associated to "GW190521 as a dynamical capture of two nonspinning black holes" [1]. The posterior samples have been obtained with bajes [2], a pipeline for gravitational wave (GW) and multimessenger astronomy, publicly availab…

GW190521 as a dynamical capture of two nonspinning black holes Open

Rossella Gamba, M. Breschi, G. Carullo, P. Rettegno, Simone Albanesi , et al. · 2022

Data release associated to "GW190521 as a dynamical capture of two nonspinning black holes" [1]. The posterior samples have been obtained with bajes [2], a pipeline for gravitational wave (GW) and multimessenger astronomy, publicly availab…

Towards a gravitational self force-informed effective-one-body waveform model for nonprecessing, eccentric, large-mass-ratio inspirals Open

Alessandro Nagar, Simone Albanesi · 2022

Building upon several recent advances in the development of effective-one-body models for spin-aligned eccentric binaries with individual masses $(m_1,m_2)$ we introduce a new EOB waveform model that aims at describing inspiralling binarie…

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