RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

A supersonically-expanding Bose-Einstein condensate: Analogies to the expanding universe?

November 11, 2016 - 12:10pm
Avinash Kumar

In standard cosmology, the expansion of the early universe occurs at a speed larger than the speed of light. This expansion also impacts many of the quantum fields that exist inside our universe. Our experiment consisting of neutral $^{23}$Na Bose-Einstein condensate trapped in an all optical ring realizes the basic features of this expansion. Specifically, we demonstrate redshifting of phonons and a reheating effect that is similar to pre-heating after the inflation stage of the universe. We also observe spontaneous non-zero winding numbers appear in the ring after the expansion is complete. We predict the widths of the resulting winding number distributions using Monte Carlo simulations according to the geodesic rule. Our experimental data agrees well with our theory, with no tunable parameters.

Lunch served at 12pm!

PSC 2136, MD 20742

Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to