Publications (143)
Vacuum Electromagnetic Counterparts of Binary Black-Hole Mergers
Philipp Mösta, Carlos Palenzuela, Luciano Rezzolla +3
As one step towards a systematic modeling of the electromagnetic (EM) emission from an inspiralling black hole binary we consider a simple scenario in which the binary moves in a u…
Magnetosphere of a Kerr black hole immersed in magnetized plasma and its perturbative mode structure
Huan Yang, Fan Zhang, Luis Lehner
This work studies jet-like electromagnetic configurations surrounding a slowly-spinning black-hole immersed in a uniformly magnetized force-free plasma. In the first part of this w…
Geometrically motivated hyperbolic coordinate conditions for numerical relativity: Analysis, issues and implementations
Carles Bona, Luis Lehner, Carlos Palenzuela-Luque
We study the implications of adopting hyperbolic driver coordinate conditions motivated by geometrical considerations. In particular, conditions that minimize the rate of change of…
Post-merger electromagnetic emissions from disks perturbed by binary black holes
Matthew Anderson, Luis Lehner, Miguel Megevand +1
We simulate the possible emission from a disk perturbed by a recoiling super-massive black hole. To this end, we study radiation transfer from the system incorporating bremsstrahlu…
Exploring Black Hole Mimickers: Electromagnetic and Gravitational Signatures of AdS Black Shells
Suvendu Giri, Ulf Danielsson, Luis Lehner +1
We study electromagnetic and gravitational properties of AdS black shells (also referred to as AdS black bubbles) -- a class of quantum gravity motivated black hole mimickers, that…
Non-linear black hole dynamics and Carrollian fluids
Jaime Redondo-Yuste, Luis Lehner
The dynamics of black hole horizons has recently been linked to that of Carrollian fluids. This results in a dictionary between geometrical quantities and those of a fluid with unu…
Excited hairy black holes: dynamical construction and level transitions
Pablo Bosch, Stephen R. Green, Luis Lehner +1
We study the dynamics of unstable Reissner-Nordström anti-de Sitter black holes under charged scalar field perturbations in spherical symmetry. We unravel their general behavior a…
A Post-Newtonian approach to black hole-fluid systems
Enrico Barausse, Luis Lehner
This work devises a formalism to obtain the equations of motion for a black hole-fluid configuration. Our approach is based on a Post-Newtonian expansion and adapted to scenarios w…
Evolutions of Magnetized and Rotating Neutron Stars
Steven L. Liebling, Luis Lehner, David Neilsen +1
We study the evolution of magnetized and rigidly rotating neutron stars within a fully general relativistic implementation of ideal magnetohydrodynamics with no assumed symmetries…
Unequal mass binary neutron star mergers and multimessenger signals
Luis Lehner, Steven L. Liebling, Carlos Palenzuela +4
We study the merger of binary neutron stars with different mass ratios adopting three different realistic, microphysical nuclear equations of state, as well as incorporating neutri…
LRP2020: The cosmic origin and evolution of the elements
Rodrigo Fernández, Falk Herwig, Samar Safi-Harb +16
The origin of many elements of the periodic table remains an unsolved problem. While many nucleosynthetic channels are broadly understood, significant uncertainties remain regardin…
Islands of stability and recurrence times in AdS
Stephen R. Green, Antoine Maillard, Luis Lehner +1
We study the stability of anti-de Sitter (AdS) spacetime to spherically symmetric perturbations of a real scalar field in general relativity. Further, we work within the context of…
Reply to "Comment on two-mode stability islands around AdS"
Alex Buchel, Stephen R. Green, Luis Lehner +1
We respond to the criticisms of a recent comment by BizoÅ and Rostworowski [arXiv:1410.2631].
Robustness of the Blandford-Znajek mechanism
Carlos Palenzuela, Carles Bona, Luis Lehner +1
The Blandford-Znajek mechanism has long been regarded as a key ingredient in models attempting to explain powerful jets in AGNs, quasars, blazzars etc. In such mechanism, energy is…
Cyberinfrastructure Requirements to Enhance Multi-messenger Astrophysics
Philip Chang, Gabrielle Allen, Warren Anderson +39
The identification of the electromagnetic counterpart of the gravitational wave event, GW170817, and discovery of neutrinos and gamma-rays from TXS 0506+056 heralded the new era of…
Magnetized Neutron Star Mergers and Gravitational Wave Signals
Matthew Anderson, Eric W. Hirschmann, Luis Lehner +5
We investigate the influence of magnetic fields upon the dynamics of and resulting gravitational waves from a binary neutron star merger in full general relativity coupled to ideal…
Universality of non-equilibrium dynamics of CFTs from holography
Alex Buchel, Stephen R. Green, Luis Lehner +1
Motivated by a low-energy effective description of gauge theory/string theory duality, we conjecture that the dynamics of -invariant states in a large class of four-dimensio…
Learning about compact binary merger: the interplay between numerical relativity and gravitational-wave astronomy
Thomas Baumgarte, Patrick Brady, Jolien D E Creighton +3
Activities in data analysis and numerical simulation of gravitational waves have to date largely proceeded independently. In this work we study how waveforms obtained from numerica…
Sourced Carrollian Fluids Dual to Black Hole Horizons
Sercan Hüsnügil, Luis Lehner
The (degenerate) geometry of event horizons is linked to Carrollian fluids. We investigate the behavior of event horizons via a perturbative coupling to a massless scalar field, ma…
Electromagnetic outflows in a class of scalar-tensor theories: binary neutron star coalescence
Marcelo Ponce, Carlos Palenzuela, Enrico Barausse +1
As we showed in previous work, the dynamics and gravitational emission of binary neutron star systems in certain scalar-tensor theories can differ significantly from that expected…
The complete spectrum of the area from recoupling theory in loop quantum gravity
Simonetta Frittelli, Luis Lehner, Carlo Rovelli
We compute the complete spectrum of the area operator in the loop representation of quantum gravity, using recoupling theory. This result extends previous derivations, which did no…
On computations of angular momentum and its flux in numerical relativity
Emanuel Gallo, Luis Lehner, Osvaldo M. Moreschi
The purpose of this note is to point out ambiguities that appear in the calculation of angular momentum and its radiated counterpart when some simple formulae are used to compute t…
Holographic Thermalization, stability of AdS, and the Fermi-Pasta-Ulam-Tsingou paradox
Venkat Balasubramanian, Alex Buchel, Stephen R. Green +2
For a real massless scalar field in general relativity with a negative cosmological constant, we uncover a large class of spherically symmetric initial conditions that are close to…
Unstable horizons and singularity development in holography
Pablo Bosch, Alex Buchel, Luis Lehner
In holographic applications one can encounter scenarios where a long-wavelength instability can arise. In such situations, it is often the case that the dynamical end point of the…
Small black holes in
Alex Buchel, Luis Lehner
We consider small black holes in , smeared on . We compute the spectrum of -quasinormal modes corresponding to fluctuations leading to…
Nonlinear/non-iterative treatment of EFT-motivated gravity
Ramiro Cayuso, Luis Lehner
We study a higher derivative extension to General Relativity and present a fully nonlinear/non-perturbative treatment to construct initial data and study its dynamical behavior in…
Perturbed disks get shocked. Binary black hole merger effects on accretion disks
Miguel Megevand, Matthew Anderson, Juhan Frank +5
The merger process of a binary black hole system can have a strong impact on a circumbinary disk. In the present work we study the effect of both central mass reduction (due to the…
End Point of the Ultraspinning Instability and Violation of Cosmic Censorship
Pau Figueras, Markus Kunesch, Luis Lehner +1
We determine the end point of the axisymmetric ultraspinning instability of asymptotically flat Myers-Perry black holes in D = 6 spacetime dimensions. In the non-linear regime, thi…
Determining the outcome of cosmic bubble collisions in full General Relativity
Matthew C. Johnson, Hiranya V. Peiris, Luis Lehner
Cosmic bubble collisions provide an important possible observational window on the dynamics of eternal inflation. In eternal inflation, our observable universe is contained in one…
Critical bubbles and implications for critical black strings
Olivier Sarbach, Luis Lehner
We demonstrate the existence of gravitational critical phenomena in higher dimensional electrovac bubble spacetimes. To this end, we study linear fluctuations about families of sta…
The instability \& gravitational wave signal in binary neutron star mergers
Luis Lehner, Steven L. Liebling, Carlos Palenzuela +1
We examine the development and detectability of the instability in the remnant of binary neutron star mergers. The detection of the gravitational mode associated with the $m=…
Neutron star mergers as a probe of modifications of general relativity with finite-range scalar forces
Laura Sagunski, Jun Zhang, Matthew C. Johnson +5
Observations of gravitational radiation from compact binary systems provide an unprecedented opportunity to test General Relativity in the strong field dynamical regime. In this pa…
High-powered Gravitational News
Nigel T. Bishop, Roberto Gómez, Luis Lehner +2
We describe the computation of the Bondi news for gravitational radiation. We have implemented a computer code for this problem. We discuss the theory behind it as well as the resu…
Arbitrary black-string deformations in the black string-black hole transitions
Matthew Anderson, Luis Lehner, Jorge Pullin
We study the possible black string-black hole transition by analyzing the structure of the apparent horizon for a large family of time-symmetric initial data. We observe that, as j…
Thermal quenches in N=2* plasmas
Alex Buchel, Luis Lehner, Robert C. Myers
We exploit gauge/gravity duality to study `thermal quenches' in a plasma of the strongly coupled N=2* gauge theory. Specifically, we consider the response of an initial thermal equ…
Intense Electromagnetic Outbursts from Collapsing Hypermassive Neutron Stars
Luis Lehner, Carlos Palenzuela, Steven L. Liebling +2
We study the gravitational collapse of a magnetized neutron star using a novel numerical approach able to capture both the dynamics of the star and the behavior of the surrounding…
A hyperbolic theory of relativistic conformal dissipative fluids
Luis Lehner, Oscar A. Reula, Marcelo E. Rubio
We develop a complete description of the class of conformal relativistic dissipative fluids of divergence form, following the formalism carried out by Geroch, Lindblom and Pennisi.…
Binary black holes' effects on electromagnetic fields
Carlos Palenzuela, Matthew Anderson, Luis Lehner +2
In addition to producing gravitational waves (GW), the dynamics of a binary black hole system could induce emission of electromagnetic (EM) radiation by affecting the behavior of p…
Black Holes Inside and Out 2024: visions for the future of black hole physics
Niayesh Afshordi, Abhay Ashtekar, Enrico Barausse +27
The gravitational physics landscape is evolving rapidly, driven by our ability to study strong-field regions, in particular black holes. Black Holes Inside and Out gathered world e…
Neutron-star mergers in scalar-tensor theories of gravity
Enrico Barausse, Carlos Palenzuela, Marcelo Ponce +1
Scalar-tensor theories of gravity are natural phenomenological alternatives to General Relativity, where the gravitational interaction is mediated by a scalar degree of freedom, be…
Black Strings, Low Viscosity Fluids, and Violation of Cosmic Censorship
Luis Lehner, Frans Pretorius
We describe the behavior of 5-dimensional black strings, subject to the Gregory-Laflamme instability. Beyond the linear level, the evolving strings exhibit a rich dynamics, where a…
Magnetospheres of Black Hole Systems in Force-Free Plasma
Carlos Palenzuela, Travis Garrett, Luis Lehner +1
The interaction of black holes with ambient magnetic fields is important for a variety of highly energetic astrophysical phenomena. We study this interaction within the force-free…
Nonlinear studies of modifications to general relativity: Comparing different approaches
Maxence Corman, Luis Lehner, William E. East +1
Studying the dynamical, nonlinear regime of modified theories of gravity remains a theoretical challenge that limits our ability to test general relativity. Here we consider two ge…
Boosting jet power in black hole spacetimes
David Neilsen, Luis Lehner, Carlos Palenzuela +4
The extraction of rotational energy from a spinning black hole via the Blandford-Znajek mechanism has long been understood as an important component in models to explain energetic…
NR/HEP: roadmap for the future
Vitor Cardoso, Leonardo Gualtieri, Carlos Herdeiro +29
Physics in curved spacetime describes a multitude of phenomena, ranging from astrophysics to high energy physics. The last few years have witnessed further progress on several fron…
Fluid-gravity correspondence and causal first-order relativistic viscous hydrodynamics
Luca Ciambelli, Luis Lehner
The fluid-gravity correspondence is a duality between anti-de Sitter Einstein gravity and a relativistic fluid living at the conformal boundary. We show that one can accommodate th…
Boson Stars in AdS
Alex Buchel, Steven L. Liebling, Luis Lehner
We construct boson stars in global Anti de Sitter (AdS) space and study their stability. Linear perturbation results suggest that the ground state along with the first three excite…
Collisions of charged black holes
Miguel Zilhão, Vitor Cardoso, Carlos Herdeiro +2
We perform fully non-linear numerical simulations of charged-black-hole collisions, described by the Einstein-Maxwell equations, and contrast the results against analytic expectati…
Black Hole Dynamics in Einstein-Maxwell-Dilaton Theory
Eric W. Hirschmann, Luis Lehner, Steven L. Liebling +1
We consider the properties and dynamics of black holes within a family of alternative theories of gravity, namely Einstein-Maxwell-dilaton (EMD) theory. We analyze the dynamical ev…
Magnetized Neutron Stars With Realistic Equations of State and Neutrino Cooling
David Neilsen, Steven L. Liebling, Matthew Anderson +3
We incorporate realistic, tabulated equations of state into fully relativistic simulations of magnetized neutron stars along with a neutrino leakage scheme which accounts for cooli…
Simulating the universe(s): from cosmic bubble collisions to cosmological observables with numerical relativity
Carroll L. Wainwright, Matthew C. Johnson, Hiranya V. Peiris +3
The theory of eternal inflation in an inflaton potential with multiple vacua predicts that our universe is one of many bubble universes nucleating and growing inside an ever-expand…
Gravitational wave spectroscopy of binary neutron star merger remnants with mode stacking
Huan Yang, Vasileios Paschalidis, Kent Yagi +3
A binary neutron star (BNS) merger event has recently been observed in gravitational waves (GWs). As in the case of binary black holes, GWs generated by BNS consist of inspiral, me…
Turbulent flows for relativistic conformal fluids in 2+1 dimensions
Federico Carrasco, Luis Lehner, Robert C. Myers +2
We demonstrate that relativistic conformal hydrodynamics in 2+1 dimensions displays a turbulent behaviour which cascades energy to longer wavelengths on both flat and spherical man…
Generic EFT-motivated beyond General Relativity gravitational wave tests and their curvature dependence: from observation to interpretation
Laura Bernard, Suvendu Giri, Luis Lehner +1
We present a "dictionary" to expedite the identification of potential deviations in gravitational waveforms from those predicted by General Relativity (GR) during the inspiral phas…
SCoRe: A New Framework to Study Unmodeled Physics from Gravitational Wave Data
Guillaume Dideron, Suvodip Mukherjee, Luis Lehner
A confident discovery of physics beyond what has been consistently modeled from gravitational wave (GW) data requires a technique that can distinguish between noise artifacts and u…
Estimating gravitational radiation from super-emitting compact binary systems
Chad Hanna, Matthew C. Johnson, Luis Lehner
Binary black hole mergers are among the most violent events in the Universe, leading to extreme warping of spacetime and copious emission of gravitational radiation. Even though bl…
Mode coupling in the nonlinear response of black holes
Yosef Zlochower, Roberto Gomez, Sascha Husa +2
We study the properties of the outgoing gravitational wave produced when a non-spinning black hole is excited by an ingoing gravitational wave. Simulations using a numerical code f…
Matching characteristic codes: exploiting two directions
Luis Lehner
Combining incoming and outgoing characteristic formulations can provide numerical relativists with a natural implementation of Einstein's equations that better exploits the causal…
Novel finite-differencing techniques for numerical relativity: application to black hole excision
Gioel Calabrese, Luis Lehner, David Neilsen +4
We use rigorous techniques from numerical analysis of hyperbolic equations in bounded domains to construct stable finite-difference schemes for Numerical Relativity, in particular…
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…
Gravitational action with null boundaries
Luis Lehner, Robert C. Myers, Eric Poisson +1
We present a complete discussion of the boundary term in the action functional of general relativity when the boundary includes null segments in addition to the more usual timelike…
Collisions of oppositely charged black holes
Miguel Zilhão, Vitor Cardoso, Carlos Herdeiro +2
The first fully non-linear numerical simulations of colliding charged black holes in D=4 Einstein-Maxwell theory were recently reported arXiv:1205.1063. These collisions were perfo…
Constraint-preserving boundary conditions in numerical relativity
Gioel Calabrese, Luis Lehner, Manuel Tiglio
This is the first paper in a series aimed to implement boundary conditions consistent with the constraints' propagation in 3D numerical relativity. Here we consider spherically sym…
Agnostically decoding gravitational wave model deficiencies in GWTC-3
Guillaume Dideron, Suvodip Mukherjee, Luis Lehner
Gravitational Wave (GW) data bring an exceptional avenue to test the underlying models of coalescing compact objects. In the regime of strong gravity and high curvature, they allow…
Critical collapse of a scalar field in semiclassical loop quantum gravity
Florencia Benitez, Rodolfo Gambini, Luis Lehner +2
We study the collapse in spherical symmetry of a massless scalar field minimally coupled to gravity using the semiclassical equations that are expected from loop quantum gravity. W…
Extreme Gravity and Fundamental Physics
B. S. Sathyaprakash, Alessandra Buonanno, Luis Lehner +26
Future gravitational-wave observations will enable unprecedented and unique science in extreme gravity and fundamental physics answering questions about the nature of dynamical spa…
Numerical Relativity: Status and Prospects
Luis Lehner
We are entering an era where the numerical construction of generic spacetimes is becoming a reality. The use of computer simulations, in principle, allows us to solve Einstein equa…
Multi-Messenger Astrophysics: Harnessing the Data Revolution
Gabrielle Allen, Warren Anderson, Erik Blaufuss +27
The past year has witnessed discovery of the first identified counterparts to a gravitational wave transient (GW 170817A) and a very high-energy neutrino (IceCube-170922A). These s…
Beyond ideal MHD: towards a more realistic modeling of relativistic astrophysical plasmas
Carlos Palenzuela, Luis Lehner, Oscar Reula +1
Many astrophysical processes involving magnetic fields and quasi-stationary processes are well described when assuming the fluid as a perfect conductor. For these systems, the idea…
The discrete energy method in numerical relativity: Towards long-term stability
Luis Lehner, David Neilsen, Oscar Reula +1
The energy method can be used to identify well-posed initial boundary value problems for quasi-linear, symmetric hyperbolic partial differential equations with maximally dissipativ…
Interaction of misaligned magnetospheres in the coalescence of binary neutron stars
Marcelo Ponce, Carlos Palenzuela, Luis Lehner +1
We study the dependence of the electromagnetic luminosity --produced by interactions of force-free magnetospheres-- on dipole inclinations in binary neutron star systems. We show t…
Towards the nonlinear regime in extensions to GR: assessing possible options
Gwyneth Allwright, Luis Lehner
Testing General Relativity and exploring possible departures has received further input with the possibility to do so through gravitational waves emitted in strongly gravitating/hi…
Grazing Collisions of Black Holes via the Excision of Singularities
Steve Brandt, Randall Correll, Roberto Gomez +10
We present the first simulations of non-headon (grazing) collisions of binary black holes in which the black hole singularities have been excised from the computational domain. Ini…
Multi-block simulations in general relativity: high order discretizations, numerical stability, and applications
Luis Lehner, Oscar Reula, Manuel Tiglio
The need to smoothly cover a computational domain of interest generically requires the adoption of several grids. To solve the problem of interest under this grid-structure one mus…
Black hole mimickers: from theory to observation
Cosimo Bambi, Ramy Brustein, Vitor Cardoso +16
The black hole paradigm, while remarkably successful, raises fundamental questions-both classical and quantum-about the nature of spacetime, horizons, and singularities. Black hole…
Quasinormal Modes Beyond Kerr
Aaron Zimmerman, Huan Yang, Zachary Mark +2
The quasinormal modes (QNMs) of a black hole spacetime are the free, decaying oscillations of the spacetime, and are well understood in the case of Kerr black holes. We discuss a m…
Constraint preserving boundary conditions for the Ideal Newtonian MHD equations
Mariana Cecere, Luis Lehner, Oscar Reula
We study and develop constraint preserving boundary conditions for the Newtonian magnetohydrodynamic equations and analyze the behavior of the numerical solution upon considering d…
Gravitational Wave Signatures of Highly Compact Boson Star Binaries
Carlos Palenzuela, Paolo Pani, Miguel Bezares +3
Solitonic boson stars are stable objects made of a complex scalar field with a compactness that can reach values comparable to that of neutron stars. A recent study of the collisio…
Tidal response of regular black holes
Chiara Coviello, Luis Lehner, Vania Vellucci
In this work, we investigate the tidal deformability of regular black holes (RBHs). Employing different phenomenological models, we analyze their response to both test fields and g…
Dual Jets from Binary Black Holes
Carlos Palenzuela, Luis Lehner, Steven L. Liebling
Supermassive black holes are found at the centers of most galaxies and their inspiral is a natural outcome when galaxies merge. The inspiral of these systems is of utmost astrophys…
Effects of High Density Phase Transitions on Neutron Star Dynamics
Steven L. Liebling, Carlos Palenzuela, Luis Lehner
Various theoretical arguments motivate an expectation of a phase transition in matter at extreme densities above nuclear density, accompanied by hopes that gravitational wave obser…
Conserved quantities and dual turbulent cascades in Anti-de Sitter spacetime
Alex Buchel, Stephen R. Green, Luis Lehner +1
We consider the dynamics of a spherically symmetric massless scalar field coupled to general relativity in Anti--de Sitter spacetime in the small-amplitude limit. Within the contex…
Modeling gravitational waves from exotic compact objects
Alexandre Toubiana, Stanislav Babak, Enrico Barausse +1
Exotic compact objects can be difficult to distinguish from black holes in the inspiral phase of the binaries observed by gravitational-wave detectors, but significant differences…
Gravitational Waves from a Fissioning White Hole
Roberto Gomez, Sascha Husa, Luis Lehner +1
We present a fully nonlinear calculation of the waveform of the gravitational radiation emitted in the fission of a vacuum white hole. At early times, the waveforms agree with clos…
Towards an understanding of the force-free magnetosphere of rapidly spinning black holes
Fan Zhang, Huan Yang, Luis Lehner
The ability of a plasma surrounding spinning black holes to extract rotational energy and power energetic emissions has been recognized as a key astrophysical phenomenon. Important…
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…
Can we distinguish low mass black holes in neutron star binaries?
Huan Yang, William E. East, Luis Lehner
The detection of gravitational waves from coalescing binary neutron stars represents another milestone in gravitational-wave astronomy. However, since LIGO is currently not as sens…
Emergent Turbulence in Nonlinear Gravity
Sizheng Ma, Luis Lehner, Huan Yang +3
Gravity in nonlinear and dynamical regimes underpins spectacular astrophysical phenomena and observable consequences, from the early universe to black hole collisions. In these ext…
Scaling Relations in Two-Dimensional Relativistic Hydrodynamic Turbulence
John Ryan Westernacher-Schneider, Luis Lehner, Yaron Oz
We derive exact scaling relations for two-dimensional relativistic hydrodynamic turbulence in the inertial range of scales. We consider both the energy cascade towards large scales…
Black hole spectroscopy with coherent mode stacking
Huan Yang, Kent Yagi, Jonathan Blackman +4
The measurement of multiple ringdown modes in gravitational waves from binary black hole mergers will allow for testing fundamental properties of black holes in General Relativity,…
Dynamical scalarization of neutron stars in scalar-tensor gravity theories
Carlos Palenzuela, Enrico Barausse, Marcelo Ponce +1
We present a framework to study generic neutron-star binaries in scalar-tensor theories of gravity. Our formalism achieves this goal by suitably interfacing a post-Newtonian orbita…
Black hole merger estimates in Einstein-Maxwell and Einstein-Maxwell-dilaton gravity
Puttarak Jai-akson, Auttakit Chatrabhuti, Oleg Evnin +1
The recent birth of gravitational wave astronomy invites a new generation of precision tests of general relativity. Signatures of black hole (BH) mergers must be systematically exp…
The Transient Gravitational-Wave Sky
Nils Andersson, John Baker, Kris Belczynski +44
Interferometric detectors will very soon give us an unprecedented view of the gravitational-wave sky, and in particular of the explosive and transient Universe. Now is the time to…
The Large-Misalignment Mechanism for the Formation of Compact Axion Structures: Signatures from the QCD Axion to Fuzzy Dark Matter
Asimina Arvanitaki, Savas Dimopoulos, Marios Galanis +3
Axions are some of the best motivated particles beyond the Standard Model. We show how the attractive self-interactions of dark matter (DM) axions over a broad range of masses, fro…
AMR, stability and higher accuracy
Luis Lehner, Steven L. Liebling, Oscar Reula
Efforts to achieve better accuracy in numerical relativity have so far focused either on implementing second order accurate adaptive mesh refinement or on defining higher order acc…
Simulating binary neutron stars: dynamics and gravitational waves
Matthew Anderson, Eric W. Hirschmann, Luis Lehner +5
We model two mergers of orbiting binary neutron stars, the first forming a black hole and the second a differentially rotating neutron star. We extract gravitational waveforms in t…
Coupled Oscillator Model for Nonlinear Gravitational Perturbations
Huan Yang, Fan Zhang, Stephen R. Green +1
Motivated by the gravity/fluid correspondence, we introduce a new method for characterizing nonlinear gravitational interactions. Namely we map the nonlinear perturbative form of t…
Estimating total momentum at finite distances
Emanuel Gallo, Luis Lehner, Osvaldo Moreschi
We study the difficulties associated with the evaluation of the total Bondi momentum at finite distances around the central source of a general (asymptotically flat) spacetime. Sin…
A numerical relativistic model of a massive particle in orbit near a Schwarzschild black hole
Nigel T. Bishop, Roberto Gomez, Sascha Husa +2
We present a method for computing the evolution of a spacetime containing a massive particle and a black hole. The essential idea is that the gravitational field is evolved using f…
Scalar field confinement as a model for accreting systems
Miguel Megevand, Ignacio Olabarrieta, Luis Lehner
We investigate the possibility to localize scalar field configurations as a model for black hole accretion. We analyze and resolve difficulties encountered when localizing scalar f…