Research Seminars @ Illinois

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Tailored for undergraduate researchers, this calendar is a curated list of research seminars at the University of Illinois. Explore the diverse world of research and expand your knowledge through engaging sessions designed to inspire and enlighten.

To have your events added or removed from this calendar, please contact OUR at ugresearch@illinois.edu

Astrophysics, Relativity, and Cosmology Seminar - Hao-Jui Kuan (UIUC) "Tidal resonance: Nonlinearities revealed by numerical relativity"

Event Type: Seminar/Symposium
Sponsor: Department of Physics
Location: Rhondale Tso Seminar Room, Loomis 236
Virtual: Join online
Date: Oct 8, 2025 11:00 am
Speaker: Hao-Jui Kuan (UIUC)
Contact: Deanna Frye
E-Mail: ddebord@illinois.edu
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Originating Calendar: Physics - Astrophysics, Relativity, and Cosmology Seminar; Gravitational-wave observations of coalescing neutron stars offer a unique window into a regime where gravity and matter interact strongly and evolve dynamically. In this talk, we examine the tidal‑resonance imprint on waveforms arising in the final ∼100 milliseconds of inspiral. Notably, the fundamental mode resonantly excited during this stage exhibits pronounced nonlinearities beyond the reach of current analytical approaches. We present a first‑of‑its‑kind suite of high‑precision numerical simulations that partially confirm our theoretical predictions while uncovering new nonlinear phenomena. We propose a simple modification to current waveform models to capture the late‑time signal, and highlight the need for more comprehensive modeling to achieve full consistency.

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