Artículo
Holographic superfluids and the Landau criterion
Amado, Irene; Areán, Daniel; Jiménez Alba, Amadeo; Landsteiner, Karl; Melgar, Luis; Salazar, Ignacio
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Fecha de publicación:
02/2014
Editorial:
Springer
Revista:
Journal of High Energy Physics
ISSN:
1126-6708
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
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Citación
Amado, Irene; Areán, Daniel; Jiménez Alba, Amadeo; Landsteiner, Karl; Melgar, Luis; et al.; Holographic superfluids and the Landau criterion; Springer; Journal of High Energy Physics; 2014; 2; 2-2014; 1-25
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