I explore the nonlinear dynamics of spacetime and matter under extreme conditions, such as when two black holes or neutron stars merge. My work combines analytical techniques with numerical simulations, keeping an eye on improving our tools for gravitational wave data analysis. Click here to read more about my research interests on black holes and neutron stars.

I am always eager to collaborate on projects related to strong-field gravity and gravitational waves. If you are also excited about these topics, and especially if you are a student, please reach out!

See inSpire or Google Scholar for an updated list of publications.

Favorite Papers

• Perturbations of plane waves and quadratic quasinormal modes on the lightring, K. Fransen, D. Pereñiguez & JRY, JHEP 12 (2025) 148.
• Perturbative and nonlinear analyses of gravitational turbulence in spacetimes with stable light rings, JRY & A. Cardenas-Avendaño, Phys. Rev. D 111 (2025) 12, 124009.
• The dynamical response of viscous objects to gravitational waves, V. Boyanov, V. Cardoso, K. Kokkotas & JRY, Phys. Rev. Lett. to appear.
• Ringdown of a dynamical spacetime, JRY, D.Pereñiguez & V. Cardoso, Phys. Rev. D 109 (2024) 4, 044048.
• Spin dependence of black hole ringdown nonlinearities, JRY, G. Carullo, J. Ripley, E. Berti & V. Cardoso, Phys. Rev. D 109 (2024) 10, L101503.

Recent Talks & Seminars

• 2025.11.28 - Gravitational Waves from Viscous Stars @ Theory Seminar, ICC-UB, Barcelona, Spain
• 2025.10.23 - Nonlinearities and High-frequency gravitational waves @ Strong Gravity Seminar, Perimeter Institute, Waterloo, Canada
• 2025.09.23 - Viscous stars and the quest for gravitational mirrors @ Gravity seminar, Johns Hopkins University, Baltimore, MD
• 2025.05.28 - Nonlinear effects in perturbation theory @ QNM Workshop, IBS, Daejeon
• 2025.04.22 - Nonlinear gravitational waves @ ACR Division Seminar, Albert Einstein Institute, Berlin
• 2025.03.12 - Turbulence of gravitational waves @ Distinguished Astrophysic Seminar, Los Alamos, NM

These are some questions that keep me up at night...