A Rapidly Expanding Bose-Einstein Condensate: An Expanding Universe in the Lab
S. Eckel, A. Kumar, T. Jacobson, I. B. Spielman, and G. K. Campbell
Phys. Rev. X 8, 021021 – Published 19 April 2018
Source/Fonte: LeCosPa
ABSTRACT
We study the dynamics of a supersonically expanding, ring-shaped Bose-Einstein condensate both experimentally and theoretically. The expansion redshifts long-wavelength excitations, as in an expanding universe. After expansion, energy in the radial mode leads to the production of bulk topological excitations—solitons and vortices—driving the production of a large number of azimuthal phonons and, at late times, causing stochastic persistent currents. These complex nonlinear dynamics, fueled by the energy stored coherently in one mode, are reminiscent of a type of “preheating” that may have taken place at the end of inflation.
Revised 3 February 2018 Received 16 October 2017
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Published by the American Physical Society
Physics Subject Headings (PhySH)
Research Areas Acoustic phonons Physical Systems Bose-Einstein condensates Solitons Superfluids Vortices Properties Distances, redshifts, & velocities Gravitation, Cosmology & Astrophysics Atomic, Molecular & Optical
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