742 citations · 1.8k across the 33 of their papers we have counts for
37 papers
Binary Black Hole Puncture Initial Data with Physics-Informed Neural Networks
Thiago Assumpção, Ignacio Brevis, Irene Pitsiladi +2
We present Pinndorama, a physics-informed neural network (PINN) code for solving the Hamiltonian constraint in the puncture formalism. The networks are trained solely on the govern…
Locating critical solutions in numerical relativity using automatic differentiation
David Bambague, Miguel Bezares, Katy Clough +1
Numerical relativity is a term used to describe the solution of the full non-linear Einstein Equations as an initial value problem using numerical methods. Individual simulations a…
Higher-derivative gravitational effective field theories are generically weakly hyperbolic
Farid Thaalba, Fernando Abalos, Miguel Bezares
We analyse the initial-value problem of metric higher-derivative effective theories of gravity. We show that any such theory whose characteristic velocities are independent of deri…
Scalar emission from binary neutron stars in scalar-tensor theories with kinetic screening
Ramiro Cayuso, Adrien Kuntz, Thiago Assumpcao +2
We investigate the scalar emission from binary neutron stars in shift-symmetric scalar-tensor theories with kinetic screening (-essence), using 3+1 numerical simulations in the…
From mergers to collapse: scalarisation dynamics in neutron star binaries
Llibert Aresté Saló, Ricard Aguilera-Miret, Miguel Bezares +1
We present the first fully non-linear evolutions of binary neutron star mergers in a moving-punctures approach in Einstein-scalar-Gauss-Bonnet gravity. We study both linear and qua…
A well-posed BSSN-type formulation for scalar-tensor theories of gravity with second-order field equations
Harry L. H. Shum, Llibert Aresté Saló, Farid Thaalba +2
Recent developments in the modified harmonic and modified puncture gauges have opened new possibilities for performing stable numerical evolutions beyond General Relativity. In thi…
MHDuet : a high-order General Relativistic Radiation MHD code for CPU and GPU architectures
Carlos Palenzuela, Miguel Bezares, Steven Liebling +12
We present MHDuet, an open source evolution code for general relativistic magnetohydrodynamics with neutrino transport. The code solves the full set of Einstein equations coupled t…
Neutron star evolution with the Bemfica-Disconzi-Noronha-Kovtun viscous hydrodynamics framework
Harry L. H. Shum, Fernando Abalos, Yago Bea +3
The recently proposed first-order viscous relativistic hydrodynamics formulation by Bemfica, Disconzi, Noronha, and Kovtun (commonly known as the BDNK formulation) has been shown t…
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…
Implications of Magnetic Flux-Disk Mass Correlation in Black Hole-Neutron Star Mergers for GRB sub-populations
Manuel R. Izquierdo, Carlos Palenzuela, Steven Liebling +2
We perform numerical relativity simulations of black hole-neutron star (BH-NS) mergers with a fixed mass ratio of , varying the BH spin to produce a wide range of post-merge…
Scalar emission from neutron star-black hole binaries in scalar-tensor theories with kinetic screening
Ramiro Cayuso, Adrien Kuntz, Miguel Bezares +1
We explore scalar radiation from neutron star-black hole binaries in scalar-tensor theories with kinetic screening (-essence). Using 3+1 numerical relativity simulations in the…
Hyperbolicity in scalar-Gauss-Bonnet gravity: a gauge invariant study for spherical evolution
Farid Thaalba, Nicola Franchini, Miguel Bezares +1
We study spherical evolution in scalar-Gauss-Bonnet gravity with additional Ricci coupling and use the gauge-invariant approach of Ref.~\cite{Reall:2021voz} to track well-posedness…
The dynamics of spherically symmetric black holes in scalar-Gauss-Bonnet gravity with a Ricci coupling
Farid Thaalba, Nicola Franchini, Miguel Bezares +1
We study the dynamics of spherically symmetric black holes in scalar Gauss-Bonnet gravity with an additional coupling between the scalar field and the Ricci scalar using non-linear…
Fixing the dynamical evolution of self-interacting vector fields
Marcelo E. Rubio, Guillermo Lara, Miguel Bezares +2
Numerical simulations of the Cauchy problem for self-interacting massive vector fields often face instabilities and apparent pathologies. We explicitly demonstrate that these issue…
Exotic compact objects: a recent numerical-relativity perspective
Miguel Bezares, Nicolas Sanchis-Gual
Beyond black holes and neutron stars, new hypothetical compact objects have been proposed as potential astrophysical entities. In general, their properties have not yet been fully…
Large Eddy Simulations of Magnetized Mergers of Black Holes and Neutron Stars
Manuel R. Izquierdo, Miguel Bezares, Steven Liebling +1
The LIGO-Virgo-Kagra collaboration has observed gravitational waves consistent with the mergers of a black hole and a neutron star, namely GW200105 and GW200115, providing evidence…
Spherical collapse in scalar-Gauss-Bonnet gravity: taming ill-posedness with a Ricci coupling
Farid Thaalba, Miguel Bezares, Nicola Franchini +1
We study spherical collapse of a scalar cloud in scalar-Gauss-Bonnet gravity - a theory in which black holes can develop scalar hair if they are in a certain mass range. We show th…
Robustness of kinetic screening against matter coupling
Guillermo Lara, Miguel Bezares, Marco Crisostomi +1
We investigate neutron star solutions in scalar-tensor theories of gravity with first-order derivative self-interactions in the action and in the matter coupling. We assess the rob…
The well-posedness of the Cauchy problem for self-interacting vector fields
Enrico Barausse, Miguel Bezares, Marco Crisostomi +1
We point out that the initial-value (Cauchy) problem for self-interacting vector fields presents the same well-posedness issues as for first-order derivative self-interacting scala…
Fixing the dynamical evolution in scalar-Gauss-Bonnet gravity
Nicola Franchini, Miguel Bezares, Enrico Barausse +1
One of the major obstacles to testing alternative theories of gravity with gravitational-wave data from merging binaries of compact objects is the formulation of their field equati…
Gravitational waves and kicks from the merger of unequal mass, highly compact boson stars
Miguel Bezares, Mateja Bošković, Steven Liebling +3
Boson stars have attracted much attention in recent decades as simple, self-consistent models of compact objects and also as self-gravitating structures formed in some dark-matter…
UV completions, fixing the equations and nonlinearities in -essence
Guillermo Lara, Miguel Bezares, Enrico Barausse
Scalar-tensor theories with first-derivative self interactions, known as -essence, may provide interesting phenomenology on cosmological scales. On smaller scales, however, init…
Dynamical Chameleon Neutron Stars: stability, radial oscillations and scalar radiation in spherical symmetry
Alexandru Dima, Miguel Bezares, Enrico Barausse
Scalar-tensor theories whose phenomenology differs significantly from general relativity on large (e.g. cosmological) scales do not typically pass local experimental tests (e.g. in…
No evidence of kinetic screening in simulations of merging binary neutron stars beyond general relativity
Miguel Bezares, Ricard Aguilera-Miret, Lotte ter Haar +3
We have conducted fully relativistic simulations in a class of scalar-tensor theories with derivative self-interactions and screening of local scales. By using high-resolution shoc…