6 papers
Axial Oscillations of Viscous Neutron Stars
SofÃa Bussières, Jaime Redondo-Yuste, José Javier Ortega Gómez +1
The oscillation modes of stars play an important role in observations, and on the understanding of stellar stability properties. The role of viscosity in the oscillation modes of c…
Ringdown and lensing of triple systems
Vitor Cardoso, Giuseppe Ficarra, Jaime Redondo-Yuste +1
Triple systems have progressively been recognized as ubiquitous in our Universe and provide a good testing ground for wave generation and propagation in nontrivial environments. We…
Superradiant amplification by rotating viscous compact objects
Jaime Redondo-Yuste, Vitor Cardoso
We study fluctuations of rotating viscous stars, using the causal relativistic hydrodynamics of Bemfica, Disconzi, Kovtun, and Noronha. We derive, in a slow-rotation approximation,…
Ringdown nonlinearities in the eikonal regime
Bruno Bucciotti, Vitor Cardoso, Adrien Kuntz +2
The eikonal limit of black hole quasinormal modes (the large multipole limit ) can be realized geometrically as a next-to-leading order solution to the geometric optics…
Dynamical Lensing Tomography of Black Hole Ringdown
Zhen Zhong, Vitor Cardoso, Yifan Chen
Strong gravitational lensing occurs when photons pass through the vicinity of a black hole. We investigate this phenomenon in the context of a gravitational-wave event, specificall…
The dynamical response of viscous objects to gravitational waves
Valentin Boyanov, Vitor Cardoso, Kostas D. Kokkotas +1
We study the dynamical response of viscous materials to gravitational waves, in the context of a fully relativistic theory of fluid dynamics. For the first time, we calculate oscil…