A5050874851- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Geophysics and Sensor Technology
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Experimental and Theoretical Physics Studies
- Numerical methods for differential equations
- Magnetic confinement fusion research
- Chaos control and synchronization
- Advanced Thermodynamic Systems and Engines
- Astrophysics and Cosmic Phenomena
- Relativity and Gravitational Theory
- Biofield Effects and Biophysics
- Quantum chaos and dynamical systems
Max Planck Institute for Gravitational Physics
2023-2025
University College Dublin
2022-2023
Second-order gravitational self-force theory has recently led to the breakthrough calculation of ``first post-adiabatic'' compact-binary waveforms [Phys. Rev. Lett. 130, 241402 (2023)]. The computations underlying those depend on a method solving perturbative second-order Einstein equation Schwarzschild background in Fourier domain. In this paper we present that method, which involves dividing domain into several regions. Different regions utilize different time slicings and allow for use...
Gravitational self-force theory is the leading approach for modeling gravitational wave emission from small mass-ratio compact binaries. This method perturbatively expands metric of binary in powers mass ratio. The source perturbations depends on orbital configuration, calculational approach, and order perturbative expansion. These sources fall into three broad classes: (i) distributional, (ii) worldtube, (iii) unbounded support. latter, particular, important emerging second-order (in ratio)...
LISA, the Laser Interferometer Space Antenna, will usher in a new era gravitational-wave astronomy. As first anticipated space-based detector, it expand our view to millihertz sky, where spectacular variety of interesting sources abound: from millions ultra-compact binaries Galaxy, mergers massive black holes at cosmological distances; beginnings inspirals that venture into ground-based detectors' death spiral compact objects holes, and many between. Central realising LISA's discovery...
Quasi-normal modes (QNMs) uniquely describe the gravitational-wave ringdown of post-merger black holes. While linear QNM regime has been extensively studied, recent work highlighted importance second-perturbative-order, quadratic QNMs (QQNMs) arising from nonlinear coupling QNMs. Previous attempts to quantify magnitude these QQNMs have shown discrepant results. Using a new hyperboloidal framework, we resolve discrepancy by showing that QQNM/QNM ratio is function not only hole parameters but...
Quasinormal modes (QNMs) uniquely describe the dominant piece of gravitational-wave ringdown postmerger black holes. While linear QNM regime has been extensively studied, recent work highlighted importance second-perturbative-order, quadratic QNMs (QQNMs) arising from nonlinear coupling QNMs. Previous attempts to quantify magnitude these QQNMs have shown discrepant results. Using a new hyperboloidal framework, we resolve discrepancy by showing that QQNM/QNM ratio is function not only hole...
Extreme mass-ratio inspirals (EMRIs) are expected to have considerable eccentricity when emitting gravitational waves (GWs) in the LISA band. Developing GW templates that remain phase accurate over these long requires use of second-order self-force theory and practical calculations now emerging for quasicircular EMRIs. These rely on effective-source regularization techniques frequency domain presently specialized circular orbits. Here we make a first step toward more generic by extending...
Postadiabatic models of extreme- and intermediate-mass-ratio inspirals will require calculations second-order gravitational self-force effects in the spacetime a spinning, Kerr black hole. We take step toward such by implementing recently formulated Teukolsky puncture scheme with Green-Hollands-Zimmerman metric reconstruction [Classical Quantum Gravity 39, 015019 (2022)]. This eliminates critical obstacle gauge singularities that arise standard ``no-string'' reconstruction. Our first...
Post-adiabatic models of extreme- and intermediate-mass-ratio inspirals will require calculations second-order gravitational self-force effects in the spacetime a spinning, Kerr black hole. We take step toward such by implementing recently formulated Teukolsky puncture scheme with Green-Hollands-Zimmerman metric reconstruction [CQG 39, 015019 (2022)]. This eliminates critical obstacle gauge singularities that arise standard no-string reconstruction. Our first proof-of-principle...
Second-order gravitational self-force theory has recently led to the breakthrough calculation of "first post-adiabatic" (1PA) compact-binary waveforms~[Phys. Rev. Lett. 130, 241402 (2023)]. The computations underlying those waveforms depend on a method solving perturbative second-order Einstein equation in Fourier domain. In this paper we present that method, which involves dividing domain into several regions. Different regions utilize different time slicings and allow for use "punctures"...
We present a novel approach for calculating the gravitational self-force (GSF) in Lorenz gauge, employing hyperboloidal slicing and spectral methods. Our method builds on previous work that applied surfaces approaches to scalar-field toy model [Phys. Rev. D 105, 104033 (2022)], extending them handle perturbations. Focusing first-order metric perturbations, we address construction of foliation, detailing minimal gauge choice. The is adopted facilitate well-understood regularisation...
Extreme mass-ratio inspirals (EMRIs) are expected to have considerable eccentricity when emitting gravitational waves (GWs) in the LISA band. Developing GW templates that remain phase accurate over these long requires use of second-order self-force theory and practical calculations now emerging for quasi-circular EMRIs. These rely on effective-source regularization techniques frequency domain presently specialized circular orbits. Here we make a first step towards more generic by extending...