A Rapidly Expanding Bose-Einstein Condensate: An Expanding Universe in the Lab

This is a paper written by S. Eckel, A. Kumar, T. Jacobson, I. B. Spielman, and G. K. Campbell in 2017 which investigates the theoretical and experimental aspects of a particular analog gravity. They’ve prepared a ring-shaped Bose-Einstein condensate (BEC) with an excited azimuthal phonon mode. Then, expanded it rapidly and they could observe (in both theory and experiment) the redshift (as expected) and Hubble friction. They’ve also shown that the external radial power leaks into asimuthal energy and hence an “analog” of reheating in cosmology.

This was a part of my studies about Analog Gravity due to my project.