TY  - JOUR
A1  - Amoretti, Andrea
A1  - Areán, Daniel
A1  - Argurio, Riccardo
A1  - Musso, Daniele
A1  - Zayas, Leopoldo A. Pando
T1  - A holographic perspective on phonons and pseudo-phonons
JF  - Journal of High Energy Physics
N2  - We analyze the concomitant spontaneous breaking of translation and conformal symmetries by introducing in a CFT a complex scalar operator that acquires a spatially dependent expectation value. The model, inspired by the holographic Q-lattice, provides a privileged setup to study the emergence of phonons from a spontaneous translational symmetry breaking in a conformal field theory and offers valuable hints for the treatment of phonons in QFT at large. We first analyze the Ward identity structure by means of standard QFT techniques, considering both spontaneous and explicit symmetry breaking. Next, by implementing holographic renormalization, we show that the same set of Ward identities holds in the holographic Q-lattice. Eventually, relying on the holographic and QFT results, we study the correlators realizing the symmetry breaking pattern and how they encode information about the low-energy spectrum.
KW  - AdS-CFT correspondence
KW  - effective field theories
KW  - holography and condensed matter physics (AdS/CMT)
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-170882
VL  - 5
IS  - 51
ER  -