Nous utilisons un point de vue de gravité analogique pour accéder à une compréhension physique des instabilités hydrodynamiques résultant de la présence de tourbillons quantiques dans des condensats atomiques à deux composantes et de leur relation avec les instabilités d’ergorégion d’objets massifs en rotation. En plus des instabilités localisées liées à la scission des tourbillons, on trouve des configurations présentant des modes dynamiquement instables qui s’étendent bien au-delà du coeur du tourbillon. Le processus de diffusion superradiante met alors en jeu l’émission de phonons dans une région beaucoup plus étendue, celle de l’ergorégion des modes de spin, et c’est dans ce cas que la physique ressemble le plus à celle des objets massifs en rotation. Nos résultats confirment le potentiel qu’ont les condensats à deux composantes à servir de modèles analogues d’espaces-temps en rotation dans différents régimes intéressants du point de vue de la gravitation.
We make use of an analog gravity perspective to obtain a physical understanding of hydrodynamic instabilities stemming from the presence of quantized vortices in two-component atomic condensates and of their relation to ergoregion instabilities of rotating massive objects in gravitation. In addition to the localized instabilities related to vortex splitting, configurations displaying dynamically unstable modes that extend well outside the vortex core are found. In this case, the superradiant scattering process involves phonon emission into the much wider ergoregion of spin modes, so the physics most closely resembles the one of rotating massive objects. Our results confirm the potential of two-component condensates as analog models of rotating space-times in different regimes of gravitational interest.
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Mot clés : Gravité analogique, superradiance, instabilité de l’ergorégion, tourbillons, condensats de Bose–Einstein à deux composantes
Anna Berti 1 ; Luca Giacomelli 1, 2 ; Iacopo Carusotto 1
@article{CRPHYS_2023__24_S3_113_0, author = {Anna Berti and Luca Giacomelli and Iacopo Carusotto}, title = {Superradiant phononic emission from the analog spin ergoregion in a two-component {Bose{\textendash}Einstein} condensate}, journal = {Comptes Rendus. Physique}, pages = {113--132}, publisher = {Acad\'emie des sciences, Paris}, volume = {24}, number = {S3}, year = {2023}, doi = {10.5802/crphys.145}, language = {en}, }
TY - JOUR AU - Anna Berti AU - Luca Giacomelli AU - Iacopo Carusotto TI - Superradiant phononic emission from the analog spin ergoregion in a two-component Bose–Einstein condensate JO - Comptes Rendus. Physique PY - 2023 SP - 113 EP - 132 VL - 24 IS - S3 PB - Académie des sciences, Paris DO - 10.5802/crphys.145 LA - en ID - CRPHYS_2023__24_S3_113_0 ER -
%0 Journal Article %A Anna Berti %A Luca Giacomelli %A Iacopo Carusotto %T Superradiant phononic emission from the analog spin ergoregion in a two-component Bose–Einstein condensate %J Comptes Rendus. Physique %D 2023 %P 113-132 %V 24 %N S3 %I Académie des sciences, Paris %R 10.5802/crphys.145 %G en %F CRPHYS_2023__24_S3_113_0
Anna Berti; Luca Giacomelli; Iacopo Carusotto. Superradiant phononic emission from the analog spin ergoregion in a two-component Bose–Einstein condensate. Comptes Rendus. Physique, Volume 24 (2023) no. S3, pp. 113-132. doi : 10.5802/crphys.145. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.145/
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