High Energy Physics Seminars next week - Savic and Eustachon - venue: Lagrange LH

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_**__*

*/!!Please note unusual venue for both seminars: 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


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*Thursday, 27 November *2025, at *16:00* - *_Lagrange Lecture 
Hall_***-*https://indico.ictp.it/event/11230/*

Fanny Eustachon (Ecole Polytechnique, Paris)


*“Long-Range Minimal Models"*
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_Abstract_

I will present a class of nonlocal conformal field theories (CFTs) in 2d 
which are obtained as deformations of the Virasoro minimal models. The 
construction proceeds by coupling a relevant primary 
operator$\phi_{r,s}$ of the m-th minimal model to a generalized free 
field. Flowing to the infrared, we reach a new class of CFTs that we 
call long-range minimal models (LRMMs). During this talk, I will discuss 
two specific types of LRMMs in the framework of conformal perturbation 
theory: the case r=s=2 corresponding to a straightforward generalization 
of an infrared duality between the deformed minimal model and a nonlocal 
Ginzburg-Landau theory proposed for the long-range Ising model ($m = 3$) 
in 2017, as well as the case (r,s)=(1,2) endowed with a well-behaved 
large m-limit obtained from both numerical extrapolations and a method 
we develop which carries out conformal perturbation theory using Mellin 
amplitudes and Coulomb gas representations of the correlators.

This is based on https://arxiv.org/abs/2509.26372


To attend via _*Zoom*_, please *_register_* here:
https://zoom.us/meeting/register/oBGRv4a4Rd62L9FUkC_8lQ