Quantum field simulator for a relativistic scalar field in curved space time

by Mr Marius Sparn (Universität Heidelberg)

Friday 15 Dec 2023, 15:00 → 16:30 Europe/Berlin

Online seminar on Zoom

https://uni-jena-de.zoom-x.de/j/64821881267?pwd=TjluNThuTnk3d0o5ZzV6MC9sRnhBUT09

Meeting-ID: 648 2188 1267
Kenncode: 428060

Abstract:

In most cosmological models, rapid expansion of space is a vital ingredient to explain the structure and contents of the universe. Here, we present an experimental implementation of  a scalar quantum field in an a 2+1-dimensional expanding FLRW space-time with a Bose-Einstein condensate. Spatial curvature is realized by shaping the density profile of the condensate. Subsequent wave packet propagation, confirms the implementation of both hyperbolic and spherical geometries. The expansion of space is implemented by a temporal control of the atomic interaction. With different ramp shapes of the interaction strength we realise uniform, accelerated and decelerated expansions. In all cases, the expansion gives rise to excitations on the condensate’s density.
Statistical analysis of the excitation structure and its time evolution reveals the production of phononic quasi-particles and allows the distinction between different expansion histories.