Publications (171)
GR-Athena++: General-relativistic magnetohydrodynamics simulations of neutron star spacetimes
William Cook, Boris Daszuta, Jacob Fields +5
We present the extension of GR-Athena++ to general-relativistic magnetohydrodynamics (GRMHD) for applications to neutron star spacetimes. The new solver couples the constrained tra…
How loud are neutron star mergers?
Sebastiano Bernuzzi, David Radice, Christian D. Ott +3
We present results from the first large parameter study of neutron star mergers using fully general relativistic simulations with finite-temperature microphysical equations of stat…
Modeling the dynamics of tidally-interacting binary neutron stars up to merger
Sebastiano Bernuzzi, Alessandro Nagar, Tim Dietrich +1
The data analysis of the gravitational wave signals emitted by coalescing neutron star binaries requires the availability of an accurate analytical representation of the dynamics a…
Ni production in long-lived binary neutron star merger remnants
Maximilian Jacobi, Fabio Magistrelli, Eleonora Loffredo +5
We investigate the nucleosynthesis and kilonova emission based on numerical-relativity binary neutron star merger simulations that incorporate a two-moment neutrino-transport schem…
Solving 3D relativistic hydrodynamical problems with WENO discontinuous Galerkin methods
Marcus Bugner, Tim Dietrich, Sebastiano Bernuzzi +2
Discontinuous Galerkin (DG) methods coupled to WENO algorithms allow high order convergence for smooth problems and for the simulation of discontinuities and shocks. In this work,…
Nonlinear-in-spin effects in effective-one-body waveform models of spin-aligned, inspiralling, neutron star binaries
Alessandro Nagar, Francesco Messina, Piero Rettegno +5
Spinning neutron stars acquire a quadrupole moment due to their own rotation. This quadratic-in-spin, self-spin effect depends on the equation of state (EOS) and affects the orbita…
Effective-one-body waveforms for precessing coalescing compact binaries with post-newtonian Twist
Rossella Gamba, Sarp Akçay, Sebastiano Bernuzzi +1
Spin precession is a generic feature of compact binary coalescences, which leaves clear imprints in the gravitational waveforms. Building on previous work, we present an efficient…
Effective-one-body waveforms for binary neutron stars using surrogate models
Benjamin D. Lackey, Sebastiano Bernuzzi, Chad R. Galley +2
Gravitational-wave observations of binary neutron star systems can provide information about the masses, spins, and structure of neutron stars. However, this requires accurate and…
Time-domain effective-one-body gravitational waveforms for coalescing compact binaries with nonprecessing spins, tides and self-spin effects
Alessandro Nagar, Sebastiano Bernuzzi, Walter Del Pozzo +21
We present TEOBResumS, a new effective-one-body (EOB) waveform model for nonprecessing (spin-aligned) and tidally interacting compact binaries.Spin-orbit and spin-spin effects are…
Entropy based flux limiting scheme for conservation laws
Georgios Doulis, Sebastiano Bernuzzi, Wolfgang Tichy
The entropy based flux-limiting (EFL) scheme is a novel approach designed to accurately resolve shocks and discontinuities in special and general relativistic hydrodynamics. By ada…
GRAthena++: puncture evolutions on vertex-centered oct-tree AMR
Boris Daszuta, Francesco Zappa, William Cook +3
Numerical relativity is central to the investigation of astrophysical sources in the dynamical and strong-field gravity regime, such as binary black hole and neutron star coalescen…
Numerical Relativity Simulations of Precessing Binary Neutron Star Mergers
Tim Dietrich, Sebastiano Bernuzzi, Bernd Bruegmann +2
We present the first set of numerical relativity simulations of binary neutron mergers that include spin precession effects and are evolved with multiple resolutions. Our simulatio…
Mergers of binary neutron stars with realistic spin
Sebastiano Bernuzzi, Tim Dietrich, Wolfgang Tichy +1
Simulations of binary neutron stars have seen great advances in terms of physical detail and numerical quality. However, the spin of the neutron stars, one of the simplest global p…
Neutron Star Merger Remnants
Sebastiano Bernuzzi
Binary neutron star mergers observations are a unique way to constrain fundamental physics and astrophysics at the extreme. The interpretation of gravitational-wave events and thei…
Exploiting Newton-factorized, 2PN-accurate, waveform multipoles in effective-one-body models for spin-aligned noncircularized binaries
Andrea Placidi, Simone Albanesi, Alessandro Nagar +3
We present a new approach to factorize and resum the post-Newtonian (PN) waveform for generic equatorial motion to be used within effective-one-body (EOB) based waveform models. Th…
Constraints on the maximum densities of neutron stars from postmerger gravitational waves with third-generation observations
Matteo Breschi, Sebastiano Bernuzzi, Daniel Godzieba +2
Using data from 289 numerical relativity simulations of merging binary neutron stars, we identify, for the first time, a robust quasi-universal relation connecting the postmerger p…
Tidal effects in binary neutron star coalescence
Sebastiano Bernuzzi, Alessandro Nagar, Marcus Thierfelder +1
We compare dynamics and waveforms from binary neutron star coalescence as computed by new long-term ( orbits) numerical relativity simulations and by the tidal effective-…
Exact Mass Conservation in Binary Neutron Star Merger Simulations
Boris Daszuta, Sebastiano Bernuzzi, Joan Fontbuté +4
A long-standing problem in the simulation of neutron star spacetimes is the treatment of vacuum regions outside the stars. The use of an artificial low-density atmosphere is a comm…
Numerical Relativity Simulations of the Neutron Star Merger GW170817: Long-Term Remnant Evolutions, Winds, Remnant Disks, and Nucleosynthesis
Vsevolod Nedora, Sebastiano Bernuzzi, David Radice +7
We present a systematic numerical-relativity study of the dynamical ejecta, winds and nucleosynthesis in neutron star merger remnants. Binaries with the chirp mass compatible with…
Fast, faithful, frequency-domain effective-one-body waveforms for compact binary coalescences
Rossella Gamba, Sebastiano Bernuzzi, Alessandro Nagar
The inference of binary neutron star properties from gravitational-wave observations requires the generation of millions of waveforms, each one spanning about three order of magnit…
Long-term GRMHD simulation of magnetic field in isolated neutron stars
Ankan Sur, William Cook, David Radice +2
Strong magnetic fields play an important role in powering the emission of neutron stars. Nevertheless a full understanding of the interior configuration of the field remains elusiv…
Mapping dynamical ejecta and disk masses from numerical relativity simulations of neutron star mergers
Vsevolod Nedora, Federico Schianchi, Sebastiano Bernuzzi +6
We present fitting formulae for the dynamical ejecta properties and remnant disk masses from the largest to date sample of numerical relativity simulations. The considered data inc…
Effective one-body model for extreme-mass-ratio spinning binaries on eccentric equatorial orbits: testing radiation reaction and waveform
Simone Albanesi, Alessandro Nagar, Sebastiano Bernuzzi
We provide a systematic analysis of the multipolar gravitational waveform, energy and angular momentum fluxes emitted by a nonspinning test particle orbiting a Kerr black hole alon…
Subgrid Modelling for Relativistic Magnetohydrodynamics with Machine Learning
William Cook, Sebastiano Bernuzzi
Resolving the impact of magnetic field instabilities in triggering small scale turbulent flow and the associated rearrangement of the field is of critical importance in understandi…
Late-time tails in nonlinear evolutions of merging black holes
Marina De Amicis, Hannes Rüter, Gregorio Carullo +17
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 ac…
Neutrino emission from binary neutron star mergers: characterizing light curves and mean energies
Marco Cusinato, Federico Maria Guercilena, Albino Perego +4
Neutrinos are copiously emitted by neutron star mergers, due to the high temperatures reached by dense matter during the merger and its aftermath. Neutrinos influence the merger dy…
Kilohertz Gravitational Waves From Binary Neutron Star Mergers: Numerical-relativity Informed Postmerger Model
Matteo Breschi, Sebastiano Bernuzzi, Kabir Chakravarti +3
We present , an analytical model of gravitational-waves from neutron star merger remnants informed using 618 numerical relativity (NR) simulations. is de…
GR-Athena++: Binary Neutron Star Merger Simulations with Neutrino Transport
Boris Daszuta, Sebastiano Bernuzzi, Maximilian Jacobi +4
We present general-relativistic radiation magnetohydrodynamics simulations of binary neutron star mergers performed with GR-Athena++. Neutrino transport is treated using a moment-b…
Kilohertz Gravitational Waves from Binary Neutron Star Mergers: Full Spectrum Analyses and High-density Constraints on Neutron Star Matter
Giulia Huez, Sebastiano Bernuzzi, Matteo Breschi +1
We demonstrate Bayesian analyses of the complete gravitational-wave spectrum of binary neutron star mergers events with the next-generation detector Einstein Telescope. Our mock an…
Gravitational waves from eccentric binary neutron star mergers: Systematic biases and inadequacy of quasicircular templates
Giulia Huez, Sebastiano Bernuzzi, Matteo Breschi +1
The use of quasicircular waveforms in matched-filter analyses of signals from eccentric binary neutron star mergers can lead to biases in the source's parameter estimation. We demo…
New Horizons for Fundamental Physics with LISA
K. G. Arun, Enis Belgacem, Robert Benkel +138
The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about the fundamental theory of nature at play in the extreme gravity regime, where the gravitatio…
Impact of in situ nuclear networks and atomic opacities on neutron star merger ejecta dynamics, nucleosynthesis, and kilonovae
Fabio Magistrelli, Sebastiano Bernuzzi, Albino Perego +2
Modeling binary neutron star merger (BNSM) ejecta evolution requires simulations involving hydrodynamics, nuclear reactions, and radiative processes. The impact of nuclear burning…
Magnetic Field Configurations in Binary Neutron Star Mergers II: Inspiral, Merger and Ejecta
William Cook, Eduardo M. Gutiérrez, Sebastiano Bernuzzi +6
We perform a series of simulations of magnetised Binary Neutron Star mergers, with varying magnetic field topologies in the initial data, as well as varying Equations of State, and…
Inferring prompt black-hole formation in neutron star mergers from gravitational-wave data
Michalis Agathos, Francesco Zappa, Sebastiano Bernuzzi +3
The gravitational-wave GW170817 is associated to the inspiral phase of a binary neutron star coalescence event. The LIGO-Virgo detectors sensitivity at high frequencies was not suf…
Assessment of Effective-One-Body Radiation Reactions for Generic Planar Orbits
Simone Albanesi, Alessandro Nagar, Sebastiano Bernuzzi +2
In this paper we assess the performances of different analytical prescriptions for the effective-one-body (EOB) radiation reaction along generic planar orbits using exact numerical…
Collapse of Magnetized White Dwarfs as site of Heavy Element Formation and Kilonova Signal
Tetyana Pitik, David Radice, Daniel Kasen +3
We present the first end-to-end calculation connecting the accretion-induced collapse (AIC) of a magnetized, rapidly rotating white dwarf to observable kilonova signatures, combini…
Adaptive mesh refinement in binary black holes simulations
Alireza Rashti, Maitraya Bhattacharyya, David Radice +3
We discuss refinement criteria for the Berger-Rigoutsos (block-based) refinement algorithm in our numerical relativity code GR-Athena++ in the context of binary black hole merger s…
Detectability of QCD phase transitions in binary neutron star mergers: Bayesian inference with the next generation gravitational wave detectors
Aviral Prakash, Ish Gupta, Matteo Breschi +5
We study the detectability of postmerger QCD phase transitions in neutron star binaries with next-generation gravitational-wave detectors Cosmic Explorer and Einstein Telescope. We…
Resonant tides in binary neutron star mergers: analytical-numerical relativity study
Rossella Gamba, Sebastiano Bernuzzi
Resonant excitations of -modes in binary neutron star coalescences influence the gravitational waves (GWs) emission in both quasicircular and highly eccentric mergers and can de…
Compact binary evolutions with the Z4c formulation
David Hilditch, Sebastiano Bernuzzi, Marcus Thierfelder +3
Numerical relativity simulations of compact binaries with the Z4c and BSSNOK formulations are compared. The Z4c formulation is advantageous in every case considered. In simulations…
Improved effective-one-body description of coalescing nonspinning black-hole binaries and its numerical-relativity completion
Thibault Damour, Alessandro Nagar, Sebastiano Bernuzzi
We improve the effective-one-body (EOB) description of nonspinning coalescing black hole binaries by incorporating several recent analytical advances, notably: (i) logarithmic cont…
Relevance of tidal effects and post-merger dynamics for binary neutron star parameter estimation
Reetika Dudi, Francesco Pannarale, Tim Dietrich +4
Measurements of the properties of binary neutron star systems from gravitational-wave observations require accurate theoretical models for such signals. However, current models are…
Inferring eccentricity evolution from observations of coalescing binary black holes
Alice Bonino, Rossella Gamba, Patricia Schmidt +5
The origin and formation of stellar-mass binary black holes remains an open question that can be addressed by precise measurements of the binary and orbital parameters from their g…
The most powerful astrophysical events: Gravitational-wave peak luminosity of binary black holes as predicted by numerical relativity
David Keitel, Xisco Jiménez Forteza, Sascha Husa +9
For a brief moment, a binary black hole (BBH) merger can be the most powerful astrophysical event in the visible universe. Here we present a model fit for this gravitational-wave p…
A new gravitational wave generation algorithm for particle perturbations of the Kerr spacetime
Enno Harms, Sebastiano Bernuzzi, Alessandro Nagar +1
We present a new approach to solve the 2+1 Teukolsky equation for gravitational perturbations of a Kerr black hole. Our approach relies on a new horizon penetrating, hyperboloidal…
CoRe database of binary neutron star merger waveforms and its application in waveform development
Tim Dietrich, David Radice, Sebastiano Bernuzzi +7
We present the Computational Relativity CoRe collaboration's public database of gravitational waveforms from binary neutron star mergers. The database currently contains 367 wavefo…
Ringdown modeling for effective-one-body waveforms in the test-mass limit for eccentric equatorial orbits around a Kerr black hole
Simone Albanesi, Sebastiano Bernuzzi, Alessandro Nagar
We study the plunge and merger of a non-spinning particle falling into a Kerr black hole following an eccentric planar inspiral. The dynamics is driven by an effective-one-body rad…
Binary Black Hole Waveforms from High-Resolution GR-Athena++ Simulations
Alireza Rashti, Rossella Gamba, Koustav Chandra +4
The detection and subsequent inference of binary black hole signals rely heavily on the accuracy of the waveform model employed. In the highly non-linear, dynamic, and strong-field…
Element formation in radiation-hydrodynamics simulations of kilonovae
Fabio Magistrelli, Sebastiano Bernuzzi, Albino Perego +1
Understanding the details of -process nucleosynthesis in binary neutron star mergers (BNSM) ejecta is key to interpreting kilonova observations and identifying the role of BNSMs…
Binary black hole merger in the extreme mass ratio limit: a multipolar analysis of the inclined orbit case
Luca Nagni, Alessandro Nagar, Rossella Gamba +2
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…
kiloHertz gravitational waves from binary neutron star remnants: time-domain model and constraints on extreme matter
Matteo Breschi, Sebastiano Bernuzzi, Francesco Zappa +4
The remnant star of a neutron star merger is an anticipated loud source of kiloHertz gravitational waves that conveys unique information on the equation of state of hot matter at e…
Long-lived Remnants from Binary Neutron Star Mergers
David Radice, Albino Perego, Sebastiano Bernuzzi +1
Massive neutron star (NS) with lifetimes of at least several seconds are expected to be the result of a sizable fraction of NS mergers. We study their formation using a large set o…
Everything everywhere all at once: A detailed study of GW230529
Koustav Chandra, Ish Gupta, Rossella Gamba +5
This study investigates the origins of GW230529, delving into its formation from massive stars within isolated binary systems. Utilizing population synthesis models, we present com…
Gravitational-wave extraction from neutron-star oscillations
Sebastiano Bernuzzi, Luca Baiotti, Giovanni Corvino +2
We compare different gravitational-wave extraction methods used in three-dimensional nonlinear simulations against linear simulations of perturbations of spherical spacetimes with…
A hybrid post-Newtonian -- effective-one-body scheme for spin-precessing compact-binary waveforms
Sarp Akcay, Rossella Gamba, Sebastiano Bernuzzi
We introduce \texttt{TEOBResumSP}: an efficient, accurate hybrid scheme for generating gravitational waveforms from spin-precessing compact binaries. The precessing waveforms are g…
GW170817: Joint Constraint on the Neutron Star Equation of State from Multimessenger Observations
David Radice, Albino Perego, Francesco Zappa +1
Gravitational waves detected from the binary neutron star (NS) merger GW170817 constrained the NS equation of state by placing an upper bound on certain parameters describing the b…
The antikick strikes back: recoil velocities for nearly-extremal binary black hole mergers in the test-mass limit
Alessandro Nagar, Enno Harms, Sebastiano Bernuzzi +1
Gravitational waves emitted from a generic binary black-hole merger carry away linear momentum anisotropically, resulting in a gravitational recoil, or "kick", of the center of mas…
Effective-one-body waveform model for noncircularized, planar, coalescing black hole binaries II:high accuracy by improving logarithmic terms in resummations
Alessandro Nagar, Danilo Chiaramello, Rossella Gamba +5
Effective-one-body (EOB) models are based on analytical building blocks that, mathematically, are truncated Taylor series with logarithms. These functions are usually resummed usin…
Numerical-Relativity-Informed Effective-One-Body model for Black-Hole-Neutron-Star Mergers with Higher Modes and Spin Precession
Alejandra Gonzalez, Rossella Gamba, Matteo Breschi +4
We present the first effective-one-body (EOB) model for generic-spins quasi-circular black-hole--neutron-star (BHNS) inspiral-merger-ringdown gravitational waveforms (GWs). Our mod…
A New Moment-Based General-Relativistic Neutrino-Radiation Transport Code: Methods and First Applications to Neutron Star Mergers
David Radice, Sebastiano Bernuzzi, Albino Perego +1
We present a new moment-based energy-integrated neutrino transport code for neutron star merger simulations in general relativity. In the merger context, ours is the first code to…
Black-hole - neutron-star mergers: new numerical-relativity simulations and multipolar effective-one-body model with spin precession and eccentricity
Alejandra Gonzalez, Sebastiano Bernuzzi, Alireza Rashti +2
In this paper, we present 52 new numerical-relativity (NR) simulations of black-hole-neutron-star merger (BHNS) mergers and employ the data to inform TEOBResumS-DalÃ: a multipolar…
Neutrino trapping and out-of-equilibrium effects in binary neutron star merger remnants
Pedro Luis Espino, Peter Hammond, David Radice +5
We study out-of-thermodynamic equilibrium effects in neutron star mergers with 3D general-relativistic neutrino-radiation large-eddy simulations. During merger, the cores of the ne…
Exploring Composition Mixing in Kilonova Ejecta with Ray-by-ray Simulations
Ruocheng Zhai, David Radice, Fabio Magistrelli +2
Binary neutron star merger (BNSM) ejecta are considered a primary repository of -process nucleosynthesis and a source of the observed heavy-element abundances. We implement comp…
On the Shear Instability in Relativistic Neutron Stars
Giovanni Corvino, Luciano Rezzolla, Sebastiano Bernuzzi +2
We present new results on instabilities in rapidly and differentially rotating neutron stars. We model the stars in full general relativity and describe the stellar matter adopting…
Machine Learning for Conservative-to-Primitive in Relativistic Hydrodynamics
Tobias Dieselhorst, William Cook, Sebastiano Bernuzzi +1
The numerical solution of relativistic hydrodynamics equations in conservative form requires root-finding algorithms that invert the conservative-to-primitive variables map. These…
Updated universal relations for tidal deformabilities of neutron stars from phenomenological equations of state
Daniel A. Godzieba, Rossella Gamba, David Radice +1
Equation of state (EOS) insensitive relations, so-called universal relations, between the neutron star (NS) compactness, its multipolar tidal deformability coefficients, and betwee…
Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts and Nucleosynthesis
David Radice, Albino Perego, Kenta Hotokezaka +3
We present a systematic numerical relativity study of the mass ejection and the associated electromagnetic transients and nucleosynthesis from binary neutron star (NS) mergers. We…
From Multimessenger Inference to Simulations: A Ranked Ensemble of Finite-Temperature Equations of State
Max Jacobi, Giulia Huez, Sebastiano Bernuzzi +1
We construct a set of microphysical, finite-temperature equations of state (EOSs) for numerical simulations of neutron star mergers and core-collapse supernovae that is consistent…
Asymptotic gravitational wave fluxes from a spinning particle in circular equatorial orbits around a rotating black hole
Enno Harms, Georgios Lukes-Gerakopoulos, Sebastiano Bernuzzi +1
We present a new computation of the asymptotic gravitational wave energy fluxes emitted by a {\it spinning} particle in circular equatorial orbits about a Kerr black hole. The part…
Effective-one-body modeling for generic compact binaries with arbitrary orbits
Simone Albanesi, Rossella Gamba, Sebastiano Bernuzzi +3
We present the first unified model for the general relativistic dynamics and gravitational radiation of generic compact binaries. TEOBResumS-Dalà is a model based on the effective…
Simulating bulk viscosity in neutron stars. II. Evolution in spherical symmetry
Giovanni Camelio, Lorenzo Gavassino, Marco Antonelli +2
Out-of-equilibrium reactions between different particle species are the main processes contributing to bulk viscosity in neutron stars. In this work, we numerically compare three d…
Simulations of rotating neutron star collapse with the puncture gauge: end state and gravitational waveforms
Tim Dietrich, Sebastiano Bernuzzi
We reexamine the gravitational collapse of rotating neutron stars to black holes by new 3+1 numerical relativity simulations employing the Z4c formulation of Einstein equations, th…
The Science of the Einstein Telescope
Adrian Abac, Raul Abramo, Simone Albanesi +485
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 ob…
Modeling the complete gravitational wave spectrum of neutron star mergers
Sebastiano Bernuzzi, Tim Dietrich, Alessandro Nagar
In the context of neutron star mergers, we study the gravitational wave spectrum of the merger remnant using numerical relativity simulations. Postmerger spectra are characterized…
Impact of moment-based, energy integrated neutrino transport on microphysics and ejecta in binary neutron star mergers
Pedro Luis Espino, David Radice, Francesco Zappa +2
We present an extensive study of the effects of neutrino transport in 3-dimensional general relativistic radiation hydrodynamics (GRHD) simulations of binary neutron star (BNS) mer…
Constraint damping for the Z4c formulation of general relativity
Andreas Weyhausen, Sebastiano Bernuzzi, David Hilditch
One possibility for avoiding constraint violation in numerical relativity simulations adopting free-evolution schemes is to modify the continuum evolution equations so that constra…
Gravitational waves and mass ejecta from binary neutron star mergers: Effect of the mass-ratio
Tim Dietrich, Maximiliano Ujevic, Wolfgang Tichy +2
We present new (3+1)D numerical relativity simulations of the binary neutron star (BNS) merger and postmerger phase. We focus on a previously inaccessible region of the binary para…
Viscous-Dynamical Ejecta from Binary Neutron Star Merger
David Radice, Albino Perego, Kenta Hotokezaka +3
General-relativistic simulations of binary neutron star mergers with viscosity reveal a new outflow mechanism operating in unequal mass binaries on dynamical timescales and enabled…
Binary Neutron Stars with Generic Spin, Eccentricity, Mass ratio, and Compactness - Quasi-equilibrium Sequences and First Evolutions
Tim Dietrich, Niclas Moldenhauer, Nathan K. Johnson-McDaniel +4
Information about the last stages of a binary neutron star inspiral and the final merger can be extracted from quasi-equilibrium configurations and dynamical evolutions. In this ar…
Performance-Portable Binary Neutron Star Mergers with AthenaK
Jacob Fields, Hengrui Zhu, David Radice +4
We introduce an extension to the AthenaK code for general-relativistic magnetohydrodynamics (GRMHD) in dynamical spacetimes using a 3+1 conservative Eulerian formulation. Like the…
Gravitational scattering of two neutron stars
Joan Fontbuté, Sebastiano Bernuzzi, Piero Rettegno +2
We present the first numerical relativity simulations of the gravitational scattering of two neutron stars. Constraint-satisfying initial data for two equal-mass nonspinning sequen…
Signatures of deconfined quark phases in binary neutron star mergers
Aviral Prakash, David Radice, Domenico Logoteta +6
(abridged) We investigate the quark deconfinement phase transition in the context of binary neutron star (BNS) mergers. We employ a new finite-temperature composition-dependent equ…
Machine Learning Gravitational Waves from Binary Black Hole Mergers
Stefano Schmidt, Matteo Breschi, Rossella Gamba +6
We apply machine learning methods to build a time-domain model for gravitational waveforms from binary black hole mergers, called mlgw. The dimensionality of the problem is handled…
Effective-one-body waveforms for extreme-mass-ratio binaries: Consistency with second-order gravitational self-force quasicircular results and extension to nonprecessing spins and eccentricity
Angelica Albertini, Rossella Gamba, Alessandro Nagar +1
We present a first complete implementation of an effective-one-body (EOB) model for extreme-mass-ratio inspirals (EMRIs) that incorporates aligned spins (on both the primary and th…
Closed-form tidal approximants for binary neutron star gravitational waveforms constructed from high-resolution numerical relativity simulations
Tim Dietrich, Sebastiano Bernuzzi, Wolfgang Tichy
We construct closed-form gravitational waveforms (GWs) with tidal effects for the coalescence and merger of binary neutron stars. The method relies on a new set of eccentricity-red…
Effective-one-body waveform model for non-circularized, planar, coalescing black hole binaries: the importance of radiation reaction
Alessandro Nagar, Rossella Gamba, Piero Rettegno +2
We present an updated version of the TEOBResumS-Dali effective-one-body (EOB) waveform model for spin aligned binaries on non-circularized orbits. Recently computed 4PN (nonspinnin…
Effective-one-body multipolar waveform for tidally interacting binary neutron stars up to merger
Sarp Akcay, Sebastiano Bernuzzi, Francesco Messina +3
Gravitational-wave astronomy with coalescing binary neutron star sources requires the availability of gravitational waveforms with tidal effects accurate up to merger. This article…
High-resolution numerical relativity simulations of spinning binary neutron star mergers
Tim Dietrich, Sebastiano Bernuzzi, Bernd Bruegmann +1
The recent detection of gravitational waves and electromagnetic counterparts emitted during and after the collision of two neutron stars marks a breakthrough in the field of multi-…
Long-lived neutron-star remnants from asymmetric binary neutron star mergers: element formation, kilonova signals and gravitational waves
Sebastiano Bernuzzi, Fabio Magistrelli, Maximilian Jacobi +3
We present 3D general-relativistic neutrino-radiation hydrodynamics simulations of two asymmetric binary neutron star mergers producing long-lived neutron stars remnants and spanni…
Binary black hole coalescence in the large-mass-ratio limit: the hyperboloidal layer method and waveforms at null infinity
Sebastiano Bernuzzi, Alessandro Nagar, Anil Zenginoglu
We compute and analyze the gravitational waveform emitted to future null infinity by a system of two black holes in the large mass ratio limit. We consider the transition from the…
Scattering and dynamical capture of two black holes: synergies between numerical and analytical methods
Simone Albanesi, Alireza Rashti, Francesco Zappa +6
We study initially unbound systems of two black holes using numerical relativity (NR) simulations performed with GR-Athena++. We focus on regions of the parameter space close to th…
XKN: a Semi-analytic Framework for the Modelling of Kilonovae
Giacomo Ricigliano, Albino Perego, Ssohrab Borhanian +4
After GW170817, kilonovae have become of great interest for the astronomical, astrophysics and nuclear physics communities, due to their potential in revealing key information on t…
Factorization and resummation: A new paradigm to improve gravitational wave amplitudes. III: the spinning test-body terms
Alessandro Nagar, Francesco Messina, Chris Kavanagh +4
We present new calculations of the energy flux of a spinning test-body on circular orbits around a Schwarzschild black hole at linear order in the particle spin. We compute the mul…
Entropy-limited higher-order central scheme for neutron star merger simulations
Georgios Doulis, Florian Atteneder, Sebastiano Bernuzzi +1
Numerical relativity simulations are the only way to calculate exact gravitational waveforms from binary neutron star mergers and to design templates for gravitational-wave astrono…
TEOBResumS: assessment of consistent next-to-quasicircular corrections and post-adiabatic approximation in multipolar binary black holes waveforms
Gunnar Riemenschneider, Piero Rettegno, Matteo Breschi +4
The use of effective-one-body (EOB) waveforms for black hole binaries analysis in gravitational-wave astronomy requires faithful models and fast generation times. A key aspect to a…
Gravitational-Wave Extraction from Neutron Star Oscillations: comparing linear and nonlinear techniques
Luca Baiotti, Sebastiano Bernuzzi, Giovanni Corvino +2
The main aim of this study is the comparison of gravitational waveforms obtained from numerical simulations which employ different numerical evolution approaches and different wave…
Spinning test-body orbiting around Schwarzschild black hole: circular dynamics and gravitational-wave fluxes
Enno Harms, Georgios Lukes-Gerakopoulos, Sebastiano Bernuzzi +1
We consider a spinning test-body in circular motion around a nonrotating black hole and analyze different prescriptions for the body's dynamics. We compare, for the first time, the…
Probing Extreme-Density Matter with Gravitational Wave Observations of Binary Neutron Star Merger Remnants
David Radice, Sebastiano Bernuzzi, Walter Del Pozzo +2
We present a proof-of-concept study, based on numerical-relativity simulations, of how gravitational waves (GWs) from neutron star merger remnants can probe the nature of matter at…
A magnetar engine for short GRBs and kilonovae
Philipp Mösta, David Radice, Roland Haas +2
We investigate the influence of magnetic fields on the evolution of binary neutron-star (BNS) merger remnants via three-dimensional (3D) dynamical-spacetime general-relativistic (G…
Unveiling the merger structure of black hole binaries in generic planar orbits
Gregorio Carullo, Simone Albanesi, Alessandro Nagar +4
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 gravitatio…