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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 3: AdS/CFT I

MP 3.1: Hauptvortrag

Dienstag, 14. März 2017, 08:30–09:15, SFG 2010

Applications of gauge/gravity duality: The example of magnetic impurities — •Johanna Erdmenger — Institut für Theoretische Physik und Astrophysik, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg

Gauge/gravity duality, or holography, provides new relations between strongly coupled quantum field theories and gravity. In addition to its intrinsic interest in relation to quantum gravity, gauge/gravity duality also provides novel approaches to studying strongly coupled systems in a wide range of areas within physics.

We illustrate this approach using a recent holographic model for a localized magnetic impurity interacting with a strongly coupled quantum field theory, in generalization of the Kondo model. We calculate the entanglement and impurity entropies and show that they agree with field theory expectations. We also study quantum quenches, which are determined by the complex eigenmodes of the gravity system. The two-point functions for this model display Fano resonances originating from the interplay between a continuum of states and a localized resonance.

[1] J. Erdmenger, C. Hoyos, A. O’Bannon, I. Papadimitriou, J. Probst, J. M. S. Wu: Holographic Kondo and Fano Resonances. arXiv:1611.09368 [hep-th]. [2] J. Erdmenger, M. Flory, C. Hoyos, M.-N. Newrzella, J. M. S. Wu: Entanglement Entropy in a Holographic Kondo Model. Fortsch.Phys. 64 (2016) 109-130 [3] J. Erdmenger, C. Hoyos, A. O’Bannon, J. M. S. Wu: A Holographic Model of the Kondo Effect. JHEP 1312 (2013) 086.