Reminder - High Energy Physics Seminar TODAY - Savic

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_**__*

*/!!Please note unusual venue: Lagrange Lecture Hall!!/*
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*Tuesday, 25 November *2025, at *16:00* - *_Lagrange Lecture 
Hall_***-*https://indico.ictp.it/event/11226/ 
<https://indico.ictp.it/event/11226/>*

Nikola Savic (IPhT, Saclay)


*“Nonlinear Love Numbers of Black Holes and Neutron Stars"*
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_Abstract_

Love numbers quantify how compact objects deform under external tidal 
fields. They are key gravitational wave observables and provide a direct 
probe of compact-object structure. At linear order, black hole (BH) Love 
numbers vanish - a consequence of the hidden symmetries of linear BH 
perturbations. I will show that this BH property persists beyond the 
linear regime.
For neutron stars, Love numbers are sensitive to the equation of state. 
Motivated by upcoming detectors. I will present calculations of 
nonlinear neutron-star Love numbers by matching relativistic stellar 
perturbations to the worldline effective field theory (EFT). Finally, I 
will discuss resonant couplings between orbital motion and stellar 
deformations and their incorporation into the worldline EFT.

To attend via _*Zoom*_, please *_register_* here:
https://zoom.us/meeting/register/ivFAZWBOQLiBp3_001_gcA