PIRSA:23040069

Video URL

https://pirsa.org/23040069

The 't Hooft equation as a quantum spectral curve

Vegh, D. (2023). The 't Hooft equation as a quantum spectral curve. Perimeter Institute for Theoretical Physics. https://pirsa.org/23040069

Vegh, David. The 't Hooft equation as a quantum spectral curve. Perimeter Institute for Theoretical Physics, Apr. 18, 2023, https://pirsa.org/23040069 

          @misc{ scivideos_PIRSA:23040069,
            doi = {10.48660/23040069},
            url = {https://pirsa.org/23040069},
            author = {Vegh, David},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {The {\textquoteright}t Hooft equation as a quantum spectral curve},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2023},
            month = {apr},
            note = {PIRSA:23040069 see, \url{https://scivideos.org/index.php/pirsa/23040069}}
          }

David Vegh Queen Mary University of London

Talk numberPIRSA:23040069
DOI10.48660/23040069
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

In this talk, I examine the massless 't Hooft equation. This integral equation governs meson bound state wavefunctions in 2D SU(N) gauge theory in the large-N limit, and it can also be obtained by quantizing a folded string in flat space. The folded string is a limiting case of a more general setup: a four-segmented string moving in three-dimensional anti-de Sitter (AdS) space. I compute its classical spectral curve using celestial variables and planar bipartite graphs, also known as on-shell diagrams or brane tilings. In this more general setup, the 't Hooft equation acquires an extra term, which has previously been proposed as an effective confining potential in QCD. After an integral transform, the equation can be inverted in terms of a finite difference equation. I show that this difference equation has a natural interpretation as the quantized (non-analytic) spectral curve of the string. The spectrum interpolates between equally spaced energy levels in the tensionless limit and 't Hooft's nearly linear Regge trajectory at infinite AdS radius.

Zoom link:  https://pitp.zoom.us/j/97373882483?pwd=NmphN0N3ckdHbHdlcVpKcGkzMHY1Zz09