Joint ICTP-SISSA-UniTS Physics Seminars - Wednesday, 08 April @ICTP - (Pomoni and Reffert)

[HECAP - Margherita Di Giovannantonio]

*_Joint ICTP-SISSA-UniTS Seminars_**__*

*Wednesday, 08 April 2026
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*14:30 - _L. Stasi Seminar Room_- https://indico.ictp.it/event/11257/*


Elli Pomoni (DESY)


*"Bootstrapping Thermal CFTs"*

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_Abstract_
In this talk, we explore the structure and solution of thermal conformal 
field theories (CFTs) using the conformal bootstrap approach. At finite 
temperature, the role of crossing symmetry is played by the 
Kubo-Martin-Schwinger (KMS) condition, which imposes periodicity on 
thermal correlation functions. We present two methods for solving the 
resulting KMS sum rules for thermal one-point functions, assuming 
knowledge of the zero-temperature CFT data. The first is a numerical 
method that incorporates the asymptotic operator product expansion (OPE) 
density of heavy operators, derived using Tauberian theorems. The second 
is an analytical approach based on dispersion relations. We benchmark 
both methods against known results in free theories and two-dimensional 
CFTs, and subsequently apply them to O(N) models for N=1,2,3, as well as 
in the large-N limit and lastly to holographic CFTs.


To attend via *Zoom, please register* here:

https://zoom.us/meeting/register/IGspikGiTbyiaptO07z8eQ



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*16:00 /- /**_L. Stasi Seminar Room_** - 
https://indico.ictp.it/event/11258/*

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<https://indico.ictp.it/event/11107/> *

Susanne Reffert (University of Bern)

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*"The Large Charge Expansion for Relativistic and Non-relativistic Physics"*

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_Abstract_
The large-charge expansion is a powerful approach for analytically 
accessing strongly-coupled models at or near criticality. We focus on a 
sector of fixed and large global charge where it is possible to express 
observables as an expansion in inverse powers of the charge.
I will first introduce the approach using the simplest relativistic 
case, namely the O(2) model. Then I will discuss how to apply the 
large-charge expansion to non-relativistic models which is relevant for 
the study of ultracold Fermi gases and nuclear physics.

To attend via *Zoom, please register* here:

https://zoom.us/meeting/register/XkIFBn9fSsqyj1vbDMrjwg