High Energy Physics ONLINE Seminars next week (Gaberdiel and Sun)

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS ONLINE SEMINARS_ **__*



*Tuesday, 12 March* 2024, at *16:00*  - *ON LINE ONLY - 
https://indico.ictp.it/event/10641//
<https://indico.ictp.it/event/10641/> /*

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Matthias Gaberdiel (ITP, ETH Zurich)

*“Tensionless Strings and Orbifolds”*

_Abstract_

I will begin by reviewing the exact duality relating tensionless string 
theory on AdS3xS3xT4 with one unit of NS-NS flux to the symmetric 
orbifold of T4. The underlying worldsheet description of this background 
also determines that of its orbifolds, and this allows us to read off 
the spectrum of the dual CFT. I shall then explain that, at least for a 
family of such orbifolds, the dual CFT is described by a subsector of 
the original symmetric orbifold where one expands around a 
`non-perturbative' state..


*To join via Zoom*:

Zoom link:https://zoom.us/j/96395172714

Meeting ID: 963 9517 2714

Password: 455371




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*Thursday, 14 March* 2024, at *16:00*  - *ON LINE ONLY - 
https://indico.ictp.it/event/10640//
<https://indico.ictp.it/event/10640/> /*

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Zimo Sun (Princeton University)

*“(A)dS Partition Function from Bulk and Edge Characters ”*

_Abstract_

The one-loop partition function of quantum fields on a fixed (A)dS 
background is an important quantity in holography.  In this talk, I will 
derive a new integral representation of such partition functions, which 
involves two group characters, e.g. the bulk character and the edge 
character.
Technically, this integral representation is a useful tool to evaluate 
functional determinants, in particular for higher spin fields. The 
higher spin holography can be understood as a miraculous bulk and edge 
cancellation in this picture.
Conceptually, the decomposition of bulk and edge characters describes 
precisely the bulk and edge modes of any spinning fields.
I will comment on the physical picture of the edge modes, which are 
localized on a horizon.
/The talk will be based on: 2009.12464 
<https://arxiv.org/abs/2009.12464>, 2010.15826 
<https://arxiv.org/abs/2010.15826> and 2111.04591 
<https://arxiv.org/abs/2111.04591>./


*To join via Zoom*:

Zoom link:https://zoom.us/j/98458928909 <https://zoom.us/j/98458928909>


Meeting ID:  984 5892 8909

Passcode:  400686