# Holography and Regge Phases at Large U(1) Charge

- Institution: CERN
- Department: TH String Theory Seminar
- Speaker: Giulia Fardelli
- Year: 2024
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3017397)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

We use holography to study the spectrum of multi-twist operators, within conformal field theories in d>2, in the large spin limit. Focusing on a CFT with a global U(1) current, we explore its phase diagram as a function of the U(1) charge Q and angular momentum J, particularly at large J and Q. For states with Q=2, the spectrum is universally described by the long-distance limit of holographic theories, independent of the CFT's specific holographic nature. We extend this analysis to states with Q>2, computing corrections to the energies of Q scalar particles coming from single photon, graviton and scalar exchange in the bulk of AdS. Additionally, we explore the extension of these results to the regime of parametrically large charge Q and discuss the potential universality of these results beyond holographic CFTs, specifically in the context of the the O(2) model in 3d. .

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## Lectures

1. [Holography and Regge Phases at Large U(1) Charge](https://invisiblenetwork.ai/learn/cern/3017397/8b9254e8c52c), 54 min (CERN's player)