122 citations · 874 across the 24 of their papers we have counts for
19 papers · 1 filter
Analytically improved and numerical-relativity informed effective-one-body model for coalescing binary neutron stars
Rossella Gamba, Matteo Breschi, Sebastiano Bernuzzi +9
Gravitational wave astronomy pipelines rely on template waveform models for searches and parameter estimation purposes. For coalescing binary neutron stars (BNS), such models need…
Effective-action model for dynamical scalarization beyond the adiabatic approximation
Mohammed Khalil, Raissa F. P. Mendes, Néstor Ortiz +1
In certain scalar-field extensions to general relativity, scalar charges can develop on compact objects in an inspiraling binary -- an effect known as dynamical scalarization. This…
Nonlinear dynamics of oscillating neutron stars in scalar-tensor gravity
Raissa F. P. Mendes, Néstor Ortiz, Nikolaos Stergioulas
The spectrum of oscillating compact objects can be considerably altered in alternative theories of gravity. In particular, it may be enriched by modes with no counterpart in genera…
Nonlinear curvature effects in gravitational waves from inspiralling black hole binaries
Banafsheh Shiralilou, Tanja Hinderer, Samaya Nissanke +2
Gravitational waves (GWs) from merging black holes allow for unprecedented probes of strong-field gravity. Testing gravity in this regime requires accurate predictions of gravitati…
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…
New class of quasinormal modes of neutron stars in scalar-tensor gravity
Raissa F. P. Mendes, Néstor Ortiz
Detection of the characteristic spectrum of pulsating neutron stars can be a powerful tool not only to probe the nuclear equation of state, but also to test modifications to genera…
Extended I-Love relations for slowly rotating neutron stars
Jérémie Gagnon-Bischoff, Stephen R. Green, Philippe Landry +1
Observations of gravitational waves from inspiralling neutron star binaries---such as GW170817---can be used to constrain the nuclear equation of state by placing bounds on stellar…
Fixing extensions to General Relativity in the non-linear regime
Juan Cayuso, Néstor Ortiz, Luis Lehner
The question of what gravitational theory could supersede General Relativity has been central in theoretical physics for decades. Many disparate alternatives have been proposed mot…
Cauchy horizon stability in a collapsing spherical dust cloud. II: Energy bounds for test fields and odd-parity gravitational perturbations
Néstor Ortiz, Olivier Sarbach
We analyze the stability of the Cauchy horizon associated with a globally naked, shell-focussing singularity arising from the complete gravitational collapse of a spherical dust cl…
Highly compact neutron stars in scalar-tensor theories of gravity: Spontaneous scalarization versus gravitational collapse
Raissa F. P. Mendes, Néstor Ortiz
Scalar-tensor theories of gravity are extensions of General Relativity (GR) including an extra, nonminimally coupled scalar degree of freedom. A wide class of these theories, albei…
Shadow of a naked singularity
Néstor Ortiz, Olivier Sarbach, Thomas Zannias
We analyze the redshift suffered by photons originating from an external source, traversing a collapsing dust cloud and finally being received by an asymptotic observer. In additio…
On the behaviour of non-radial null geodesics in self-similar Tolman-Bondi collapse
Néstor Ortiz, Olivier Sarbach, Thomas Zannias
Motivated by recent work on the structure of the singularity in inhomogeneous Tolman-Bondi collapse models, we investigate the behaviour of null geodesics in the particular case wh…
Observational distinction between black holes and naked singularities: the role of the redshift function
Néstor Ortiz, Olivier Sarbach, Thomas Zannias
We suggest that the redshift of photons traveling from past to future null infinity through a collapsing object could provide an observational signature capable of differentiating…
The gravitational redshift of photons traversing a collapsing dust cloud and observable consequences
Néstor Ortiz, Olivier Sarbach
We analyze the frequency shift of photons propagating on an asymptotically flat spacetime describing a collapsing, spherical dust cloud. We focus on the case where the interaction…
Cauchy horizon stability in a collapsing spherical dust cloud I: geometric optic approximation and spherically symmetric test fields
Néstor Ortiz, Olivier Sarbach
A spherical dust cloud which is initially at rest and which has a monotonously decaying density profile collapses and forms a shell-focussing singularity. Provided the density prof…
Linear perturbations of self-gravitating spherically symmetric configurations
Eliana Chaverra, Néstor Ortiz, Olivier Sarbach
We present a new covariant, gauge-invariant formalism describing linear metric perturbation fields on any spherically symmetric background in general relativity. The advantage of t…
Conformal diagrams for the gravitational collapse of a spherically symmetric dust cloud
Néstor Ortiz, Olivier Sarbach
We present an algorithm for the construction of conformal coordinates in the interior of a spherically symmetric, collapsing matter cloud in general relativity. This algorithm is b…
Initial data giving rise to naked singularities in spherically symmetric dust collapse
Néstor Ortiz
The phase space corresponding to a particular four-parameter family of initial data for the gravitational collapse of a spherically symmetric dust cloud is investigated. In a certa…
Conformal diagrams for the gravitational collapse of a spherical dust cloud
Néstor Ortiz, Olivier Sarbach
We present an algorithm for the construction of conformal coordinates in the interior of a spherically symmetric, collapsing matter cloud in general relativity. This algorithm is b…