Alessandro Nagar
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View article: Binary black hole merger in the extreme mass ratio limit: a multipolar analysis of the inclined orbit case
Binary black hole merger in the extreme mass ratio limit: a multipolar analysis of the inclined orbit case Open
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…
View article: Comparing effective-one-body and Mathisson-Papapetrou-Dixon results for a spinning test particle on circular equatorial orbits around a Kerr black hole
Comparing effective-one-body and Mathisson-Papapetrou-Dixon results for a spinning test particle on circular equatorial orbits around a Kerr black hole Open
We consider a spinning test particle around a rotating black hole and compare the Mathisson-Papapetrou-Dixon (MPD) formalism under the Tulczyjew-Dixon spin supplementary condition to the test-mass limit of the effective-one-body (EOB) Hami…
View article: Effective-one-body modeling for generic compact binaries with arbitrary orbits
Effective-one-body modeling for generic compact binaries with arbitrary orbits Open
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…
View article: A novel Lagrange-multiplier approach to the effective-one-body dynamics of binary systems in post-Minkowskian gravity
A novel Lagrange-multiplier approach to the effective-one-body dynamics of binary systems in post-Minkowskian gravity Open
We present a new approach to the conservative dynamics of binary systems, within the effective one-body (EOB) framework, based on the use of a Lagrange multiplier to impose the mass-shell constraint. When applied to the post-Minkowskian (P…
View article: Scattering and dynamical capture of two black holes: Synergies between numerical and analytical methods
Scattering and dynamical capture of two black holes: Synergies between numerical and analytical methods Open
International audience
View article: Comparing second-order gravitational self-force and effective-one-body waveforms from inspiralling, quasicircular black hole binaries with a nonspinning primary and a spinning secondary
Comparing second-order gravitational self-force and effective-one-body waveforms from inspiralling, quasicircular black hole binaries with a nonspinning primary and a spinning secondary Open
We present the first comparison of waveforms evaluated using the effective-one-body (EOB) approach and gravitational self-force (GSF) theory for inspiralling black hole binaries with a non-spinning primary and a spinning secondary. This pa…
View article: Effective-one-body waveform model for noncircularized, planar, coalescing black hole binaries II:high accuracy by improving logarithmic terms in resummations
Effective-one-body waveform model for noncircularized, planar, coalescing black hole binaries II:high accuracy by improving logarithmic terms in resummations Open
Effective-one-body (EOB) models are based on analytical building blocks that, mathematically, are truncated Taylor series with logarithms. These functions are usually resummed using Padé approximants obtained first assuming that the logari…
View article: Effective-one-body waveform model for non-circularized, planar, coalescing black hole binaries: the importance of radiation reaction
Effective-one-body waveform model for non-circularized, planar, coalescing black hole binaries: the importance of radiation reaction Open
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 (nonspinning) terms are incorporated in the waveform and radiation rea…
View article: Gravitational spin-orbit coupling through the third-subleading post-Newtonian order: exploring spin-gauge flexibility
Gravitational spin-orbit coupling through the third-subleading post-Newtonian order: exploring spin-gauge flexibility Open
We build upon recent work by Antonelli et al. [Phys. Rev. Lett. 125 (2020) 1, 011103] to obtain, within the effective-one-body (EOB) formalism, and for an arbitrary choice of gauge, the third-subleading post-Newtonian (4.5PN) corrections t…
View article: Double copy, Kerr-Schild gauges and the Effective-One-Body formalism
Double copy, Kerr-Schild gauges and the Effective-One-Body formalism Open
We look for a classical double copy structure between gravity and electrodynamics by connecting the descriptions of the scattering of two point masses, and of two point charges, in terms of perturbative (post-Minkowskian or post-Lorentzian…
View article: 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
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 Open
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 the secondary) as well as orbital eccentricity. The model ext…
View article: Unveiling the merger structure of black hole binaries in generic planar orbits
Unveiling the merger structure of black hole binaries in generic planar orbits Open
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…
View article: Analytically improved and numerical-relativity informed effective-one-body model for coalescing binary neutron stars
Analytically improved and numerical-relativity informed effective-one-body model for coalescing binary neutron stars Open
Gravitational wave astronomy pipelines rely on template waveform models for searches and parameter estimation purposes. For coalescing binary neutron stars (BNS), such models need to accurately reproduce numerical relativity (NR) up to mer…
View article: Faithful effective-one-body waveform of small-mass-ratio coalescing black hole binaries: the eccentric, nonspinning, case
Faithful effective-one-body waveform of small-mass-ratio coalescing black hole binaries: the eccentric, nonspinning, case Open
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…
View article: 2.5PN accurate waveform information for generic-planar-orbit binaries in effective one-body models
2.5PN accurate waveform information for generic-planar-orbit binaries in effective one-body models Open
We provide the post-Newtonian (PN) waveform for binary systems in motion along generic planar orbits at 2.5PN accuracy, in terms of the dynamical variables of the effective one-body (EOB) formalism. In addition to the calculation of the hi…
View article: Analytic systematics in next-generation of effective-one-body gravitational waveform models for future observations
Analytic systematics in next-generation of effective-one-body gravitational waveform models for future observations Open
The success of analytic waveform modeling within the effective-one-body (EOB) approach relies on the precise understanding of the physical importance of each technical element included in the model. The urgency of constructing progressivel…
View article: Inferring eccentricity evolution from observations of coalescing binary black holes
Inferring eccentricity evolution from observations of coalescing binary black holes Open
International audience
View article: Numerical-Relativity-Informed Effective-One-Body model for Black-Hole-Neutron-Star Mergers with Higher Modes and Spin Precession
Numerical-Relativity-Informed Effective-One-Body model for Black-Hole-Neutron-Star Mergers with Higher Modes and Spin Precession Open
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 model is based on a new numerical-relativity (NR) informed exp…
View article: Effective one body Hamiltonian in scalar-tensor gravity at third post-Newtonian order
Effective one body Hamiltonian in scalar-tensor gravity at third post-Newtonian order Open
We determine the general local-in-time effective-one-body (EOB) Hamiltonian for massless Scalar-Tensor (ST) theories at third post-Newtonian (PN) order. Starting from the Lagrangian derived in [Phys. Rev. D 99, 044047 (2019)], we map it to…
View article: Comparing second-order gravitational self-force, numerical relativity, and effective one body waveforms from inspiralling, quasicircular, and nonspinning black hole binaries
Comparing second-order gravitational self-force, numerical relativity, and effective one body waveforms from inspiralling, quasicircular, and nonspinning black hole binaries Open
We present the first systematic comparison between gravitational waveforms emitted by inspiralling, quasicircular and nonspinning black hole binaries computed with three different approaches: second-order gravitational self-force (2GSF) th…
View article: Comparing second-order gravitational self-force and effective one body waveforms from inspiralling, quasicircular and nonspinning black hole binaries. II. The large-mass-ratio case
Comparing second-order gravitational self-force and effective one body waveforms from inspiralling, quasicircular and nonspinning black hole binaries. II. The large-mass-ratio case Open
We compare recently computed waveforms from second-order gravitational\nself-force (GSF) theory to those generated by a new, GSF-informed, effective\none body (EOB) waveform model for (spin-aligned, eccentric) inspiralling black\nhole bina…
View article: GW190521 as a dynamical capture of two nonspinning black holes
GW190521 as a dynamical capture of two nonspinning black holes Open
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…
View article: GW190521 as a dynamical capture of two nonspinning black holes
GW190521 as a dynamical capture of two nonspinning black holes Open
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…
View article: Towards a gravitational self force-informed effective-one-body waveform model for nonprecessing, eccentric, large-mass-ratio inspirals
Towards a gravitational self force-informed effective-one-body waveform model for nonprecessing, eccentric, large-mass-ratio inspirals Open
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…
View article: Inferring eccentricity evolution from observations of coalescing binary black holes
Inferring eccentricity evolution from observations of coalescing binary black holes Open
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 gravitational-wave signal. Such binaries are expected to cir…
View article: Numerical-relativity validation of effective-one-body waveforms in the intermediate-mass-ratio regime
Numerical-relativity validation of effective-one-body waveforms in the intermediate-mass-ratio regime Open
One of the open problems in developing binary black hole (BBH) waveforms for gravitational wave astronomy is to model the intermediate mass ratio regime and connect it to the extreme mass ratio regime. A natural approach is to employ the e…
View article: New avenue for accurate analytical waveforms and fluxes for eccentric compact binaries
New avenue for accurate analytical waveforms and fluxes for eccentric compact binaries Open
We introduce a new paradigm for constructing accurate analytic waveforms (and\nfluxes) for eccentric compact binaries. Our recipe builds on the standard\nPost-Newtonian (PN) approach but (i) retains implicit time-derivatives of the\nphase …
View article: Assessment of effective-one-body radiation reactions for generic planar orbits
Assessment of effective-one-body radiation reactions for generic planar orbits Open
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 result in the test-mass limit. We consider three prescript…
View article: Exploiting Newton-factorized, 2PN-accurate waveform multipoles in effective-one-body models for spin-aligned noncircularized binaries
Exploiting Newton-factorized, 2PN-accurate waveform multipoles in effective-one-body models for spin-aligned noncircularized binaries Open
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. The new multipolar waveform factorization improves previous p…
View article: Strong-field scattering of two spinning black holes: Numerics versus Analytics
Strong-field scattering of two spinning black holes: Numerics versus Analytics Open
We present new Numerical Relativity calculations of the scattering angle $χ$ between two, equal-mass, black holes on hyperbolic-like orbits. We build upon previous work considering, for the first time, spinning black holes, with equal spin…