Adrien Kuntz
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View article: Probing supermassive black hole scalarization with pulsar timing arrays
Probing supermassive black hole scalarization with pulsar timing arrays Open
Scalar-tensor theories with a scalar field coupled to the Gauss-Bonnet invariant can evade no-hair theorems and allow for non-trivial scalar profiles around black holes. This coupling is characterized by a length scale $λ$, which, in an ef…
View article: Searching for Gravitational Waves with Gaia and its Cross-Correlation with PTA: Absolute vs Relative Astrometry
Searching for Gravitational Waves with Gaia and its Cross-Correlation with PTA: Absolute vs Relative Astrometry Open
Astrometric missions like Gaia provide exceptionally precise measurements of stellar positions and proper motions. Gravitational waves traveling between the observer and distant stars can induce small, correlated shifts in these apparent p…
View article: Systematic bias in LISA ringdown analysis due to waveform inaccuracy
Systematic bias in LISA ringdown analysis due to waveform inaccuracy Open
Inaccurate modeling of gravitational-wave signals can introduce systematic biases in the inferred source parameters. As detector sensitivities improve and signals become louder, mitigating such waveform-induced systematics becomes increasi…
View article: Black hole spectroscopy: from theory to experiment
Black hole spectroscopy: from theory to experiment Open
The "ringdown" radiation emitted by oscillating black holes has great scientific potential. By carefully predicting the frequencies and amplitudes of black hole quasinormal modes and comparing them with gravitational-wave data from compact…
View article: Ringdown nonlinearities in the eikonal regime
Ringdown nonlinearities in the eikonal regime Open
The eikonal limit of black hole quasinormal modes (the large multipole limit $\ell \gg 1$) can be realized geometrically as a next-to-leading order solution to the geometric optics approximation, and also as linear fluctuations about the P…
View article: Quadratic quasinormal modes of a Schwarzschild black hole
Quadratic quasinormal modes of a Schwarzschild black hole Open
Quadratic quasinormal mode, generated at second order in black hole perturbation theory, are a promising target for testing gravity in the nonlinear regime with next-generation gravitational wave detectors. While their frequencies have lon…
View article: Scalar emission from neutron star-black hole binaries in scalar-tensor theories with kinetic screening
Scalar emission from neutron star-black hole binaries in scalar-tensor theories with kinetic screening Open
We explore scalar radiation from neutron star-black hole binaries in scalar-tensor theories with kinetic screening ($K$-essence). Using 3+1 numerical relativity simulations in the decoupling limit, we investigate scalar dipole and quadrupo…
View article: Amplitudes and polarizations of quadratic quasi-normal modes for a Schwarzschild black hole
Amplitudes and polarizations of quadratic quasi-normal modes for a Schwarzschild black hole Open
A bstract General Relativity predicts the existence of quadratic quasi-normal modes at second order in perturbation theory. Building on our recent work, we compute the amplitudes and polarizations of these modes for non-rotating black hole…
View article: Constraints on conformal ultralight dark matter couplings from the European Pulsar Timing Array
Constraints on conformal ultralight dark matter couplings from the European Pulsar Timing Array Open
Millisecond pulsars are extremely precise celestial clocks: as they rotate,\nthe beamed radio waves emitted along the axis of their magnetic field can be\ndetected with radio telescopes, which allows for tracking subtle changes in the\npul…
View article: Amplitudes and Polarizations of Quadratic Quasi-Normal Modes for a Schwarzschild Black Hole
Amplitudes and Polarizations of Quadratic Quasi-Normal Modes for a Schwarzschild Black Hole Open
General Relativity predicts the existence of quadratic quasi-normal modes at second order in perturbation theory. Building on our recent work, we compute the amplitudes and polarizations of these modes for non-rotating black holes, showing…
View article: Nonlinear quasinormal mode detectability with next-generation gravitational wave detectors
Nonlinear quasinormal mode detectability with next-generation gravitational wave detectors Open
In the aftermath of a binary black hole merger event, the gravitational wave\nsignal emitted by the remnant black hole is modeled as a superposition of\ndamped sinusoids known as quasinormal modes. While the dominant quasinormal\nmodes ori…
View article: Angular momentum sensitivities in scalar-tensor theories
Angular momentum sensitivities in scalar-tensor theories Open
Scalar-tensor theories have a long history as possible phenomenological alternatives to General Relativity, but are known to potentially produce deviations from the (strong) equivalence principle in systems involving self-gravitating objec…
View article: Quadratic Quasi-Normal Modes of a Schwarzschild Black Hole
Quadratic Quasi-Normal Modes of a Schwarzschild Black Hole Open
Quadratic quasi-normal modes, generated at second order in black hole perturbation theory, are a promising target for testing gravity in the nonlinear regime with next-generation gravitational wave detectors. While their frequencies have l…
View article: Nonlinear quasi-normal modes: uniform approximation
Nonlinear quasi-normal modes: uniform approximation Open
A bstract Recent works have suggested that nonlinear (quadratic) effects in black hole perturbation theory may be important for describing a black hole ringdown. We show that the technique of uniform approximations can be used to accuratel…
View article: Nonlinear Quasi-Normal Modes: Uniform Approximation
Nonlinear Quasi-Normal Modes: Uniform Approximation Open
Recent works have suggested that nonlinear (quadratic) effects in black hole perturbation theory may be important for describing a black hole ringdown. We show that the technique of uniform approximations can be used to accurately compute …
View article: A supplementary radiation-reaction force between two binaries
A supplementary radiation-reaction force between two binaries Open
Radiation-reaction forces originating from the emission of gravitational waves (GW) bring binaries to close proximity and are thus responsible for virtually all the mergers that we can observe in GW interferometers. We show that there exis…
View article: Transverse Doppler effect and parameter estimation of LISA three-body systems
Transverse Doppler effect and parameter estimation of LISA three-body systems Open
Some binary black hole systems potentially observable in LISA could be in orbit around a supermassive black hole (SMBH). The imprint of relativistic three-body effects on the waveform of the binary can be used to estimate all the parameter…
View article: Effective two-body approach to the hierarchical three-body problem: quadrupole to 1PN
Effective two-body approach to the hierarchical three-body problem: quadrupole to 1PN Open
Many binary systems of interest for gravitational-wave astronomy are orbited by a third distant body, which can considerably alter their relativistic dynamics. Precision computations are needed to understand the interplay between relativis…
View article: Erratum to: On perturbation theory and critical exponents for self-similar systems
Erratum to: On perturbation theory and critical exponents for self-similar systems Open
View article: Precession resonances in hierarchical triple systems
Precession resonances in hierarchical triple systems Open
We describe a new kind of resonance occuring in relativistic three-body\nhierarchical systems: the precession resonance, occuring when the relativistic\nprecession timescale of a binary equals the period of a distant perturber. We\nfind th…
View article: Precession resonances in hierarchical triple systems
Precession resonances in hierarchical triple systems Open
We describe a new kind of resonance occuring in relativistic three-body hierarchical systems: the precession resonance, occuring when the relativistic precession timescale of a binary equals the period of a distant perturber. We find that,…
View article: Effective two-body approach to the hierarchical three-body problem
Effective two-body approach to the hierarchical three-body problem Open
The motion of three bodies can be solved perturbatively when a tightly bound\ninner binary is orbited by a distant perturber, giving rise for example to the\nwell-known Kozai-Lidov oscillations. We propose to study the relativistic\nhierar…
View article: On perturbation theory and critical exponents for self-similar systems
On perturbation theory and critical exponents for self-similar systems Open
View article: Testing gravity with the two-body problem
Testing gravity with the two-body problem Open
Gravitational waves provide a new probe into the strong-field regime of gravity. It is thus essential to identify the predictions of General Relativity on the nature of the two-body problem, and to contrast them to alternative theories. Th…
View article: Half-solution to the two-body problem in general relativity
Half-solution to the two-body problem in general relativity Open
We show that the introduction of two worldline parameters defines a different\napproach to computations in the effective field theory approach to the two-body\nproblem in General Relativity and present some preliminary evidence for a\nredu…
View article: Extreme mass ratio inspirals with scalar hair
Extreme mass ratio inspirals with scalar hair Open
Stellar mass objects orbiting around supermassive black holes are primary\ntargets for future gravitational wave detectors like LISA. However, in theories\nbeyond general relativity, the corresponding waveform templates are still\nrelative…
View article: Two-body potential of Vainshtein screened theories
Two-body potential of Vainshtein screened theories Open
Adding a light scalar degree of freedom to General Relativity often induces a\nfifth force whose magnitude is strongly constrained by laboratory experiments\nand solar system tests. The Vainshtein screening mechanism ensures that the\neffe…
View article: Disformally coupled scalar fields and inspiralling trajectories
Disformally coupled scalar fields and inspiralling trajectories Open
We show how a nearly massless scalar field conformally and disformally\ncoupled to matter can affect the dynamics of two bodies in their inspiralling\nphase before merging. We discuss both the conservative dynamics, e.g. how the\nenergy of…
View article: Effective field theory for gravitational radiation in scalar-tensor gravity
Effective field theory for gravitational radiation in scalar-tensor gravity Open
A light scalar degree of freedom, as the one possibly responsible for the accelerated expansion of the Universe, could leave observable traces in the inspiral gravitational wave signal of binary systems. In order to study these effects, we…