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SUMMARY:Nonlinear Hydrodynamics in Gravitational-Wave\, High-Energy\, and 
 Exoplanetary Astrophysics
DTSTART:20260114T053000Z
DTEND:20260114T063000Z
DTSTAMP:20261016T181600Z
UID:indico-event-4737@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Hang Yu\n\nHost: Dong LaiJoin Tencent Meeting：http
 s://meeting.tencent.com/dm/mzUp0ApvgUn2 Meeting ID: 226600179 (no passwo
 rd）Abstract:Nonlinear hydrodynamics plays a central role in shaping the 
 evolution of compact binaries across astrophysics. In this talk\, I will d
 iscuss nonlinear effects in two classes of systems. The first is coalescin
 g neutron star (NS) binaries. I will show that nonlinear interactions prim
 arily manifest as shifts in the natural frequencies of NS oscillation mode
 s\, in particular\, the fundamental and gravity modes. As a result\, nonli
 nearities can substantially enhance the dynamical tidal response of NSs an
 d produce gravitational-wave phase shifts of order one radian. Modeling th
 is effect provides a new probe of NS physics beyond the linear tidal defor
 mability\, while neglecting it can bias the equation-of-state inference\, 
 especially when information from a population of detections is combined. T
 he same theoretical framework also enables a first-principles description 
 of post-merger oscillations in merger remnants. In the second half of the 
 talk\, I will discuss how nonlinear hydrodynamics determines the Roche lim
 it in eccentric\, asynchronous binaries. This theoretical breakthrough exp
 lains results from previous numerical simulations and enables their reliab
 le extrapolation. As an application\, I will present a new model of repeat
 ed partial tidal disruption events (rpTDEs) that naturally produces the ir
 regular recurrence times that have been observed in at least some candidat
 es.Biography:Hang Yu is a theoretical astrophysicist and Assistant Profess
 or of Physics at Montana State University (2023-). He received his Ph.D. i
 n Physics from MIT in 2019\, followed by postdoctoral fellowships at Calte
 ch (2019-2022) and the Kavli Institute for Theoretical Physics (2022-2023)
 . His research focuses on nonlinear hydrodynamics and tidal interactions i
 n compact binaries\, with applications to gravitational-wave sources\, hig
 h-energy transients\, and exoplanetary systems.\n\nhttps://indico-tdli.sjt
 u.edu.cn/event/4737/
LOCATION:Online (Tsung-Dao Lee Institute)
URL:https://indico-tdli.sjtu.edu.cn/event/4737/
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