Ergoregion instability of a rotating quantum system

Oliveira, Leandro A.; Garay, Luis J.; Crispino, Luís C. B.

doi:10.1103/physrevd.97.124063

Cited by 8 publications

(4 citation statements)

References 51 publications

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“…In the analog system context, superradiant scattering has been widely studied from the theoretical point of view [19][20][21][22][23] and has been recently observed in experiments using surface gravity waves on top of a water flow configuration displaying a draining vortex [24]. Ergoregion instabilities have also been theoretically studied in purely rotating vortex configurations in ideal fluids [25,26]. We are here interested in quantized vortices in superfluids: their purely azimuthal v θ ∝ 1/r irrotational flow pattern becomes supersonic in the vicinity of the vortex core and corresponds to an analog rotating space-time with an ergoregion but no horizon.…”

Section: Introductionmentioning

confidence: 99%

Ergoregion instabilities in rotating two-dimensional Bose-Einstein condensates: Perspectives on the stability of quantized vortices

Giacomelli

Carusotto

2020

Phys. Rev. Research

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We investigate the stability of vortices in two-dimensional Bose-Einstein condensates. In analogy with rotating space-times and with a careful account of boundary conditions, we show that the dynamical instability of multiply quantized vortices in trapped condensates persists in untrapped, spatially homogeneous geometries and has an ergoregion nature with some modification due to the peculiar dispersion of Bogoliubov sound. Our results open perspectives to the physics of vortices in trapped condensates, where multiply quantized vortices can be stabilized by interference effects and singly charged vortices can become unstable in suitably designed trap potentials. We show how superradiant scattering can be observed also in the short-time dynamics of dynamically unstable systems, providing an alternative point of view on dynamical (in)stability phenomena in spatially finite systems.

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Section: Introductionmentioning

confidence: 99%

Ergoregion instabilities in rotating two-dimensional Bose-Einstein condensates: Perspectives on the stability of quantized vortices

Giacomelli

Carusotto

2020

Phys. Rev. Research

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“…[36], which shows that non-zero vorticity can act as an effective mass term, thus allowing quasibound states to appear in vortex flows). For superradiance, the presence of an event horizon is not mandatory [7,[37][38][39]: it can be replaced by any dissipative material, as in the case of Zel'dovich's cylinder that scatters electromagnetic waves [40] or in the case of a rotating cylinder that dissipates the energy of water waves [41]. Here, building on the ideas of Refs.…”

Section: Introductionmentioning

confidence: 99%

Synchronized stationary clouds in a static fluid

Benone¹,

Crispino²,

Herdeiro³

et al. 2018

Physics Letters B

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The existence of stationary bound states for the hydrodynamic velocity field between two concentric cylinders is established. We argue that rotational motion, together with a trapping mechanism for the associated field, is sufficient to mitigate energy dissipation between the cylinders, thus allowing the existence of infinitely long lived modes, which we dub stationary clouds. We demonstrate the existence of such stationary clouds for sound and surface waves when the fluid is static and the internal cylinder rotates with constant angular velocity Ω. These setups provide a unique opportunity for the first experimental observation of synchronized stationary clouds. As in the case of bosonic fields around rotating black holes and black hole analogues, the existence of these clouds relies on a synchronization condition between Ω and the angular phase velocity of the cloud.

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“…Rotating Bose-Einstein condensates (BEC) are promising platforms to study superradiant phenomena [25,30]. A number of theoretical studies have investigated superradiance in configurations featuring a single vortex located at the center of a cylindrically symmetric trap as well as in planar geometries involving synthetic magnetic fields [31].…”

Section: Introductionmentioning

confidence: 99%

Superradiant phononic emission from the analog spin ergoregion in a two-component Bose–Einstein condensate

Berti¹,

Giacomelli²,

Carusotto³

2024

Comptes Rendus. Physique

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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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Ergoregion instability of a rotating quantum system

Cited by 8 publications

References 51 publications

Ergoregion instabilities in rotating two-dimensional Bose-Einstein condensates: Perspectives on the stability of quantized vortices

Ergoregion instabilities in rotating two-dimensional Bose-Einstein condensates: Perspectives on the stability of quantized vortices

Synchronized stationary clouds in a static fluid

Superradiant phononic emission from the analog spin ergoregion in a two-component Bose–Einstein condensate

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