REMINDER - Joint ICTP-SISSA-UNITS Physics Seminars TODAY @ UniTS (Rychkov and van Rees)

[HECAP - Margherita Di Giovannantonio]

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



*Wednesday, 28 February* 2024 - *UniTS, Aula 1 A Conferenze, Edificio D
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*14:30 - https://indico.ictp.it/event/10652/
<https://indico.ictp.it/event/10652/>*


Slava Rychkov (IHES, Paris)

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*"O(N)xO(2) Model from 4d to 3d _ The Tale of Disappearing Fixed Points"*

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*_Abstract_
O(N) xO(2) model of 2N scalar fields in the bifundamental representation 
of the global symmetry group furnishes an example of a system where 
unitary fixed points exist not for all N but in a range of N above some 
N_c(d), where N_c(d) is a rapidly varying function of dimension d. I 
will describe how N_c(d) can be found using the conformal bootstrap. I 
will also describe the relation of our work to a contentious issue of 
"focus fixed points" which has been identified in this model by previous 
work.
/Joint work with Marten Reehorst, Balt van Rees, and Benoit Sirois./


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*/16:00 - /*https://indico.ictp.it/event/10653/*/
/* <https://indico.ictp.it/event/10653/>

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Balt van Rees (École Polytechnique, Paris)

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*"QFT in AdS instead of LSZ"*

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_Abstract*/
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The Boundary correlation functions for a QFT in a fixed AdS background 
should reduce to S-matrix elements in the flat-space limit. We consider 
this procedure in detail for four-point functions. With minimal 
assumptions we rigorously show that the resulting S-matrix element obeys 
a dispersion relation, the non-linear unitarity conditions, and the 
Froissart-Martin bound. QFT and AdS thus provides an alternative route 
to fundamental QFT results that normally  rely on the same LSZ axioms._*/
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