Publications (29)
Evolutions in 3D numerical relativity using fixed mesh refinement
Erik Schnetter, Scott H. Hawley, Ian Hawke
We present results of 3D numerical simulations using a finite difference code featuring fixed mesh refinement (FMR), in which a subset of the computational domain is refined in spa…
Signatures of Low Mass Black Hole-Neutron Star Mergers
Rahime Matur, Ian Hawke, Nils Andersson
The recent observation of the GW230529 event indicates that black hole-neutron star binaries can contain low-mass black holes. Since lower mass systems are more favourable for tida…
Black hole formation through fragmentation of toroidal polytropes
Burkhard Zink, Nikolaos Stergioulas, Ian Hawke +3
We investigate new paths to black hole formation by considering the general relativistic evolution of a differentially rotating polytrope with toroidal shape. We find that this pol…
Magnon-Driven Domain-Wall Motion with the Dzyaloshinskii-Moriya Interaction
Weiwei Wang, Maximilian Albert, Marijan Beg +5
We study domain wall (DW) motion induced by spin waves (magnons) in the presence of Dzyaloshinskii-Moriya interaction (DMI). The DMI exerts a torque on the DW when spin waves pass…
A Reproducible Black Hole-Neutron Star Merger Gallery Example for the Einstein Toolkit
Rahime Matur, Beyhan KarakaÅ, Roland Haas +3
Black hole-neutron star mergers, together with binary neutron star mergers, are key laboratories for neutron star physics. They enable us to probe merger dynamics imprinted in grav…
A resistive extension for ideal MHD
Alex James Wright, Ian Hawke
We present an extension to the special relativistic, ideal magnetohydrodynamics (MHD) equations, designed to capture effects due to resistivity. The extension takes the simple form…
A dissipative extension to ideal hydrodynamics
Marcus J. Hatton, Ian Hawke
We present a formulation of special relativistic, dissipative hydrodynamics (SRDHD) derived from the well-established Müller- Israel-Stewart (MIS) formalism using an expansion in…
Excision without excision: the relativistic turducken
David Brown, Olivier Sarbach, Erik Schnetter +4
to turducken (turduckens, turduckening, turduckened, turduckened) [math.]: To stuff a black hole. We analyze and apply an alternative to black hole excision based on smoothing the…
Rotating Collapse of Stellar Iron Cores in General Relativity
Christian D. Ott, Harald Dimmelmeier, Andreas Marek +4
We present results from the first 2+1 and 3+1 simulations of the collapse of rotating stellar iron cores in general relativity employing a finite-temperature equation of state and…
Numerical relativity simulations in the era of the Einstein Telescope
Mark Hannam, Ian Hawke
Numerical-relativity (NR) simulations of compact binaries are expected to be an invaluable tool in gravitational-wave (GW) astronomy. The sensitivity of future detectors such as th…
Instabilities in neutron-star postmerger remnants
Xiaoyi Xie, Ian Hawke, Andrea Passamonti +1
Using nonlinear, fully relativistic, simulations we investigate the dynamics and gravitational-wave signature associated with instabilities in neutron star postmerger remnants. For…
Gravitational wave extraction based on Cauchy-characteristic extraction and characteristic evolution
Maria Babiuc, Bela Szilagyi, Ian Hawke +1
We implement a code to find the gravitational news at future null infinity by using data from a Cauchy code as boundary data for a characteristic code. This technique of Cauchy-cha…
Fragmentation of general relativistic quasi-toroidal polytropes
Burkhard Zink, Nikolaos Stergioulas, Ian Hawke +3
We investigate the role of rotational instabilities in the context of black hole formation in relativistic stars. In addition to the standard scenario - an axially symmetric dynami…
Non-axisymmetric instability and fragmentation of general relativistic quasi-toroidal stars
Burkhard Zink, Nikolaos Stergioulas, Ian Hawke +3
In a recent publication, we have demonstrated that differentially rotating stars admit new channels of black hole formation via fragmentation instabilities. Since a higher order in…
Impact of black hole spin on low-mass black hole-neutron star mergers
Rahime Matur, Ian Hawke, Nils Andersson
The recent detection of GW230529 suggests that black hole-neutron star mergers may involve low-mass black holes, potentially producing detectable electromagnetic counterparts. Moti…
Higher-level large-eddy filtering strategy for general relativistic fluid simulations
Thomas Celora, Nils Andersson, Ian Hawke +2
Nonlinear simulations of neutron star mergers are complicated by the need to represent turbulent dynamics. As we cannot (yet) perform simulations that resolve accurately both the g…
A covariant approach to relativistic large-eddy simulations: The fibration picture
Thomas Celora, Nils Andersson, Ian Hawke +1
Models of turbulent flows require the resolution of a vast range of scales, from large eddies to small-scale features directly associated with dissipation. As the required resoluti…
A new three-dimensional general-relativistic hydrodynamics code
Luca Baiotti, Ian Hawke, Pedro J. Montero +1
We present a new three-dimensional general relativistic hydrodynamics code, the Whisky code. This code incorporates the expertise developed over the past years in the numerical sol…
Resistive and multi-fluid RMHD on graphics processing units
Alex James Wright, Ian Hawke
In this work we present a proof of concept of CUDA-capable, resistive, multi-fluid models of relativistic magnetohydrodynamics (RMHD). Resistive and multi-fluid codes for simulatin…
Collapse of differentially rotating supermassive stars: Post black hole formation
Motoyuki Saijo, Ian Hawke
We investigate the collapse of differentially rotating supermassive stars (SMSs) by means of 3+1 hydrodynamic simulations in general relativity. We particularly focus on the onset…
Dynamical evolution of quasi-circular binary black hole data
Miguel Alcubierre, Bernd Bruegmann, Peter Diener +8
We study the fully nonlinear dynamical evolution of binary black hole data, whose orbital parameters are specified via the effective potential method for determining quasi-circular…
Thermal aspects of neutron star mergers
Peter Hammond, Ian Hawke, Nils Andersson
In order to extract maximal information from neutron-star merger signals, both gravitational and electromagnetic, we need to ensure that our theoretical models/numerical simulation…
Excision methods for high resolution shock capturing schemes applied to general relativistic hydrodynamics
Ian Hawke, Frank Löffler, Andrea Nerozzi
We present a simple method for applying excision boundary conditions for the relativistic Euler equations. This method depends on the use of Reconstruction-Evolution methods, a sta…
Toward standard testbeds for numerical relativity
Miguel Alcubierre, Gabrielle Allen, Carles Bona +18
In recent years, many different numerical evolution schemes for Einstein's equations have been proposed to address stability and accuracy problems that have plagued the numerical r…
On the gravitational radiation from the collapse of neutron stars to rotating black holes
Luca Baiotti, Ian Hawke, Luciano Rezzolla
We provide details and present additional results on the numerical study of the gravitational-wave emission from the collapse of neutron stars to rotating black holes in three dime…
pyro: a framework for hydrodynamics explorations and prototyping
Alice Harpole, Michael Zingale, Ian Hawke +1
pyro is a Python-based simulation framework designed for ease of implementation and exploration of hydrodynamics methods. It is built in a object-oriented fashion, allowing for the…
Turbulence modelling in neutron star merger simulations
David Radice, Ian Hawke
Observations of neutron star mergers have the potential to unveil detailed physics of matter and gravity in regimes inaccessible by other experiments. Quantitative comparisons to t…
Detecting the impact of nuclear reactions on neutron star mergers through gravitational waves
Peter Hammond, Ian Hawke, Nils Andersson
Nuclear reactions may affect gravitational-wave signals from neutron-star mergers, but the impact is uncertain. In order to quantify the effect, we compare two numerical simulation…
A conservation law formulation of nonlinear elasticity in general relativity
Carsten Gundlach, Ian Hawke, Stephanie J. Erickson
We present a practical framework for ideal hyperelasticity in numerical relativity. For this purpose, we recast the formalism of Carter and Quintana as a set of Eulerian conservati…