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Experimental particle production in time-dependent spacetimes: a one-dimensional scattering problem

We experimentally study cosmological particle production in a two-dimensional Bose-Einstein condensate, whose density excitations map to an analog cosmology. The expansion of spacetime is realized with tunable interactions. The particle spectrum can be understood through an analogy to quantum mechan...

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Main Authors: Sparn, Marius (Author) , Kath, Elinor (Author) , Liebster, Nikolas (Author) , Duchene, Jelte (Author) , Schmidt, Christian F. (Author) , Tolosa-Simeón, Mireia (Author) , Parra-López, Álvaro (Author) , Floerchinger, Stefan (Author) , Strobel, Helmut (Author) , Oberthaler, Markus K. (Author)
Format: Article (Journal)
Language:English
Published: 24 December 2024
In: Physical review letters
Year: 2024, Volume: 133, Issue: 26, Pages: 1-6
ISSN:1079-7114
DOI:10.1103/PhysRevLett.133.260201
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.133.260201
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.133.260201
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Author Notes:Marius Sparn, Elinor Kath, Nikolas Liebster, Jelte Duchene, Christian F. Schmidt, Mireia Tolosa-Simeón, Álvaro Parra-López, Stefan Floerchinger, Helmut Strobel, and Markus K. Oberthaler
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Summary:We experimentally study cosmological particle production in a two-dimensional Bose-Einstein condensate, whose density excitations map to an analog cosmology. The expansion of spacetime is realized with tunable interactions. The particle spectrum can be understood through an analogy to quantum mechanical scattering, in which the dynamics of the spacetime metric determine the shape of the scattering potential. Hallmark scattering phenomena such as resonant forward scattering and Bragg reflection are connected to their cosmological counterparts, namely linearly expanding space and bouncing universes. We compare our findings to a theoretical description that extends beyond the acoustic approximation, which enables us to apply the model to high-momentum excitations.
Item Description:Gesehen am 21.08.2025
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.133.260201

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