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Quasinormal mode analysis in BEC acoustic black holes Barcelo, C. Cano, A. Garay Elizondo, Luis Javier Jannes, G. 51-73 Analog Física-Modelos matemáticos Física matemática © 2007 The American Physical Society. C. B. has been funded by the Spanish MEC under Project No. FIS2005-05736-C03-01 with a partial FEDER contribution. G. J. was supported by CSIC Grant No. I3P-BPD2005 of the I3P programme, cofinanced by the European Social Fund, and by he Spanish MEC under Project No. FIS2005-05736-C03-01. L. G. was supported by the Spanish MEC under Project No. FIS2005-05736-C03-02. The authors also acknowledge support from the Spanish MEC Project No. FIS2006-26387-E. We perform a quasinormal mode analysis of black-hole configurations in Bose-Einstein condensates (BECs). In this analysis we use the full Bogoliubov dispersion relation, not just the hydrodynamic or geometric approximation. We restrict our attention to one-dimensional flows in BECs with steplike discontinuities. For this case we show that in the hydrodynamic approximation quasinormal modes do not exist. The full dispersion relation, however, allows the existence of quasinormal modes. Remarkably, the spectrum of these modes is not discrete but continuous. Spanish MEC CSIC Depto. de Física Teórica Fac. de Ciencias Físicas TRUE pub 2023-06-20T10:51:36Z 2023-06-20T10:51:36Z 2007-04 journal article https://hdl.handle.net/20.500.14352/51350 1550-7998 10.1103/PhysRevD.75.084024 eng FIS2005-05736-C03-01 I3P-BPD2005 FIS2005-05736-C03-01 FIS2005-05736-C03-02 FIS2006-26387-E. open access application/pdf Amer Physical Soc