A Rapidly Expanding Bose-Einstein Condensate: An Expanding Universe in the Lab
A Rapidly Expanding Bose-Einstein Condensate: An Expanding Universe in the Lab
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DOI：
10.1103/physrevx.8.021021
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发表时间：
2018-04-19
影响因子：
12.5
通讯作者：
Campbell, G. K.
中科院分区：
文献类型：
--
作者：
Eckel, S.;Kumar, A.;Campbell, G. K.
我们从实验和理论两方面研究了超音速膨胀的环形玻色-爱因斯坦凝聚体的动力学。膨胀使长波长激发红移，就像在膨胀的宇宙中一样。膨胀后，在径向模式的能量导致生产散装拓扑激发孤子和涡旋驱动生产大量的方位角声子，并在后期，造成随机持续电流。这些复杂的非线性动力学，由在一种模式中相干存储的能量提供燃料，让人想起可能在暴胀结束时发生的一种“预热”。
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.