PIRSA:17060018

Quantum critical responses via holographic models and conformal perturbation theory

APA

Sierens, T. (2017). Quantum critical responses via holographic models and conformal perturbation theory. Perimeter Institute for Theoretical Physics. https://pirsa.org/17060018

MLA

Sierens, Todd. Quantum critical responses via holographic models and conformal perturbation theory. Perimeter Institute for Theoretical Physics, Jun. 01, 2017, https://pirsa.org/17060018

BibTex

          @misc{ scivideos_PIRSA:17060018,
            doi = {10.48660/17060018},
            url = {https://pirsa.org/17060018},
            author = {Sierens, Todd},
            keywords = {Other Physics},
            language = {en},
            title = {Quantum critical responses via holographic models and conformal perturbation theory},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2017},
            month = {jun},
            note = {PIRSA:17060018 see, \url{https://scivideos.org/pirsa/17060018}}
          }
          
Talk numberPIRSA:17060018
Source RepositoryPIRSA
Collection
Talk Type Conference
Subject

Abstract

We investigate response functions near quantum critical points, allowing for finite temperature and a mild deformation by a relevant scalar. When the quantum critical point is described by a conformal field theory, we use conformal perturbation theory and holography to determine the two leading corrections to the scalar two-point function and to the conductivity. We build a bridge between the couplings fixed by conformal symmetry with the interaction couplings in the gravity theory. We construct a minimal holographic model that allows us to numerically obtain the response functions at all frequencies, independently confirming the corrections to the high-frequency response functions. In addition to probing the physics of the ultraviolet, the holographic model probes the physics of the infrared giving us qualitative insight into new physics scalings.