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

Abstract

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.

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Cited by in corpus (8)

• Toward the Observation of Entangled Pairs in BEC analogue Expanding Universes
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• Relevance of "on" and "off" transitions in quantum pair production experiments
• Quantifying two-mode entanglement of bosonic Gaussian states from their full counting statistics
• Parametric pair production of collective excitations in a Bose-Einstein condensate
• Harvesting entanglement from the Lorentz-violating quantum field vacuum in a dipolar Bose-Einstein condensate
• Emergent quantum field theories on curved spacetimes in spinor Bose-Einstein condensates: from scalar to Proca fields
• Superluminal modes in a quantum field simulator for cosmology from analog trans-Planckian physics