96 citations · 624 across the 25 of their papers we have counts for
25 papers
Nonlinear Dynamics near the Threshold of Gravitational Collapse
Jaime Redondo-Yuste, Josu C. Aurrekoetxea
Perturbation theory is an essential tool to model and interpret gravitational dynamics, for example, binary black hole mergers. Therefore it is also crucial to precisely understand…
Preheating and oscillon formation in Einstein-scalar-Gauss-Bonnet gravity
Areef Waeming, Josu C. Aurrekoetxea, Katy Clough +2
Non-perturbative processes in the early universe may create overdense structures in scalar fields like the inflaton, called oscillons. In this work, we explore whether the leading…
On curvature corrections for field theory cosmic strings
Josu C. Aurrekoetxea, Jose J. Blanco-Pillado, Alberto García Martín-Caro +1
We present a combined analytical and numerical study of the effective action of field theory cosmic strings in the Abelian-Higgs model in flat space. Starting directly from the und…
Scalar fields around black hole binaries in LIGO-Virgo-KAGRA
Soumen Roy, Rodrigo Vicente, Josu C. Aurrekoetxea +2
Light scalar particles arise naturally in many extensions of the Standard Model and are compelling dark-matter candidates. Gravitational interactions near black holes can trigger t…
GRTresna: An open-source code to solve the initial data constraints in numerical relativity
Josu C. Aurrekoetxea, Sam E. Brady, Llibert Aresté-Saló +11
GRTresna is a multigrid solver designed to solve the constraint equations for the initial data required in numerical relativity simulations. In particular, it is focussed on scenar…
Self-interacting scalar dark matter around binary black holes
Josu C. Aurrekoetxea, James Marsden, Katy Clough +1
Gravitational waves can provide crucial insights about the environments in which black holes live. In this work, we use numerical relativity simulations to study the behaviour of s…
Cosmology using numerical relativity
Josu C. Aurrekoetxea, Katy Clough, Eugene A. Lim
This review is an up-to-date account of the use of numerical relativity to study dynamical, strong-gravity environments in a cosmological context. First, we provide a gentle introd…
Robustness of inflation to kinetic inhomogeneities
Matthew Elley, Josu C. Aurrekoetxea, Katy Clough +3
We investigate the effects of large inhomogeneities in both the inflaton field and its momentum. We find that in general, large kinetic perturbations reduce the number of e-folds o…
Symmetry restoration and vacuum decay from accretion around black holes
James Marsden, Josu C. Aurrekoetxea, Katy Clough +1
Vacuum decay and symmetry breaking play an important role in the fundamental structure of the matter and the evolution of the universe. In this work we study how the purely classic…
Revisiting the cosmic string origin of GW190521
Josu C. Aurrekoetxea, Charlie Hoy, Mark Hannam
For the first time we analyse gravitational-wave strain data using waveforms constructed from strong gravity simulations of cosmic string loops collapsing to Schwarzschild black ho…
The effect of wave dark matter on equal mass black hole mergers
Josu C. Aurrekoetxea, Katy Clough, Jamie Bamber +1
For dark matter to be detectable with gravitational waves from binary black holes, it must reach higher than average densities in their vicinity. In the case of light (wave-like) d…
Waveform Modelling for the Laser Interferometer Space Antenna
LISA Consortium Waveform Working Group, Niayesh Afshordi, Sarp Akçay +144
LISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave astronomy. As the first anticipated space-based gravitational-wave detector, it will exp…
GRDzhadzha: A code for evolving relativistic matter on analytic metric backgrounds
Josu C. Aurrekoetxea, Jamie Bamber, Sam E. Brady +5
GRDzhadzha is an open-source code for relativistic simulations of matter fields on curved spacetimes that admit an analytic description (e.g. stationary black holes). It is based o…
Spinning primordial black holes formed during a matter-dominated era
Eloy de Jong, Josu C. Aurrekoetxea, Eugene A. Lim +1
We study the formation of spinning primordial black holes during an early matter-dominated era. Using non-linear 3+1D general relativistic simulations, we compute the efficiency of…
Oscillon formation during inflationary preheating with general relativity
Josu C. Aurrekoetxea, Katy Clough, Francesco Muia
We study the non-perturbative evolution of inflationary fluctuations during preheating using fully non-linear general-relativistic field-theory simulations. We choose a single-fiel…
Electromagnetic instability of compact axion stars
Liina M. Chung-Jukko, Eugene A. Lim, David J. E. Marsh +3
If the dark matter is composed of axions, then axion stars are expected to be abundant in the Universe. We demonstrate in fully non-linear (3+1) numerical relativity the instabilit…
Black hole merger simulations in wave dark matter environments
Jamie Bamber, Josu C. Aurrekoetxea, Katy Clough +1
The interaction of binary black hole mergers with their environments can be studied using numerical relativity simulations. These start only a short finite time before merger, at w…
CTTK: A new method to solve the initial data constraints in numerical relativity
Josu C. Aurrekoetxea, Katy Clough, Eugene A. Lim
In numerical relativity simulations with non-trivial matter configurations, one must solve the Hamiltonian and momentum constraints of the ADM formulation for the metric variables…
Where is the ringdown? Reconstructing quasinormal modes from dispersive waves
Josu C. Aurrekoetxea, Pedro G. Ferreira, Katy Clough +2
We study the generation and propagation of gravitational waves in scalar-tensor gravity using numerical relativity simulations of scalar field collapses beyond spherical symmetry.…
GRChombo: An adaptable numerical relativity code for fundamental physics
Tomas Andrade, Llibert Areste Salo, Josu C. Aurrekoetxea +29
GRChombo is an open-source code for performing Numerical Relativity time evolutions, built on top of the publicly available Chombo software for the solution of PDEs. Whilst GRChomb…
Lessons for adaptive mesh refinement in numerical relativity
Miren Radia, Ulrich Sperhake, Amelia Drew +7
We demonstrate the flexibility and utility of the Berger-Rigoutsos Adaptive Mesh Refinement (AMR) algorithm used in the open-source numerical relativity code GRChombo for generatin…
Primordial black hole formation with full numerical relativity
Eloy de Jong, Josu C. Aurrekoetxea, Eugene A. Lim
We study the formation of black holes from subhorizon and superhorizon perturbations in a matter dominated universe with 3+1D numerical relativity simulations. We find that there a…
Coherent Gravitational Waveforms and Memory from Cosmic String Loops
Josu C. Aurrekoetxea, Thomas Helfer, Eugene A. Lim
We construct, for the first time, the time-domain gravitational wave strain waveform from the collapse of a strongly gravitating Abelian Higgs cosmic string loop in full general re…
The Effects of Potential Shape on Inhomogeneous Inflation
Josu C. Aurrekoetxea, Katy Clough, Raphael Flauger +1
We study the robustness of single-field inflation against inhomogeneities. We derive a simple analytic criterion on the shape of the potential for successful inflation in the prese…