High Energy Physics Seminars next week (Santoni and Mouland)

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_**__*



*Tuesday, 16 April* 2024, at *16:00*  - *LUIGI STASI SEMINAR ROOM - 
https://indico.ictp.it/event/10685//
<https://indico.ictp.it/event/10685/> /*

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Luca Santoni (APC, Paris)

*“Vanishing of Nonlinear Tidal Deformability of Schwarzschild Black Holes”*

_Abstract_

It is well known that the induced linear tidal response of Schwarzschild 
black holes, as opposed to other types of astrophysical compact objects, 
is exactly zero in general relativity. I will discuss the role of 
nonlinearities in the calculation of the tidal response of black holes 
beyond linear order. After solving the static nonlinear Einstein 
equations for the perturbations, I will explicitly perform the matching 
with the point-particle effective theory and show that the tidal 
deformability remains zero at higher order in perturbation theory.



<https://indico.ictp.it/event/10616/>

This is a hybrid event. *To join via Zoom*:

Zoom link: https://zoom.us/j/93956248932



Meeting ID: 939 5624 8932

Password: 651371



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*Thursday, 18 April* 2024, at *16:00*  - *LUIGI STASI SEMINAR ROOM - 
https://indico.ictp.it/event/10687//
<https://indico.ictp.it/event/10687/> /*

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Mouland Rishi (University of Cambridge)

*“Fermion-Monopole Scattering in the Standard Model”*

_Abstract_

It’s been known since the work of Callan and Rubakov that a generic 
gauge theory harbours a riddle: the scattering of light fermions off 
heavy monopoles necessitates exotic outgoing states with fractional 
occupation numbers. I will first explain how we can finally make sense 
of these outgoing states in the modern language of generalised 
symmetries: They arise as states in a twisted Hilbert space, which is 
generated by operators at the edge of a topological surface. I will then 
apply this general formalism to the original case of interest, the 
Standard Model itself, which exhibits a number of new features. I will 
finally discuss various other scenarios, including some that require 
non-invertible symmetry defects.



This is a hybrid event. *To join via Zoom*:

Zoom link: https://zoom.us/j/93124307428



Meeting ID: 931 2430 7428

Password: 691466