Year: 2014
Type: article
Abstract: We revisit the question of stability of holographic superfluids with finite super-fluid velocity. Our method is based on applying the Landau criterion to the Quasinormal Mode (QNM) spectrum. In particular we study the QNMs related to the Goldstone modes of spontaneous symmetry breaking with linear and quadratic dispersions. In the linear case we show that the sound velocity becomes negative for large enough superfluid velocity and that the imaginary part of the quasinormal frequency moves to the upper half plane. Since the instability is strongest at finite wavelength, we take this as an indication for the existence of an inhomogeneous or striped condensed phase for large superfluid velocity. In the quadratic case the instability is present for arbitrarily small superfluid velocity.
Source: Journal of High Energy Physics
Authors: Irene Amado, Daniel Areán, Amadeo Jiménez-Alba, Karl Landsteiner, Luis Melgar, Ignacio Salazar Landea
Institutions: Technion – Israel Institute of Technology, The Abdus Salam International Centre for Theoretical Physics (ICTP), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Consejo Superior de Investigaciones Científicas, Instituto de Física Teórica, Universidad Autónoma de Madrid, Instituto de Física La Plata, Universidad Nacional de La Plata
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2093758024