Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Probing Hubble Attenuation and Amplification in a Expanding and Contracting Bose Einstein Condensate

Jul 20, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session

Description

In cosmology, the relativistic scalar fields that cause the universe to expand are damped by Hubble friction, which is due to the dilation of the underlying spacetime metric. Here, we have simulated the Hubble friction using a toroidal Bose-Einstein condensate (BEC) of 23Na atoms, in which the phonon fields can serve as an analogy to the cosmological scalar fields. We experimentally measure both Hubble attenuation and amplification, with five-fold better accuracy, by expanding and contracting the BEC universe. We discover temporal phase-dependent attenuation and amplification of the phonon field, which is only possible under non-adiabatic processes and is not described by the theoretical model. The measured strength of the Hubble friction disagrees with recent theories.

Presenter name Yanda Geng
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Primary authors

Dr Swarnav Banik (Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland) Dr Monica Gutierrez Galan (Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland) Dr Hector Sosa-Martinez (Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland) Ms Madison Anderson (Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland) Dr Stephen Eckel (Sensor Sciences Division, National Institute of Standards and Technology) Dr Ian Spielman ( Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland) Dr Gretchen Campbell (Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland)

Presentation materials

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