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Bose Einstein Condensates for Analogue Cosmology Experiments

July 12, 2021 - 2:00pm
Monica Gutierrez Galan

Dissertation Committee Chair: James Williams, Chair



Gretchen Campbell, Co-Chair/Advisor

Ian Spielman

Theodore Jacobson

Ronald Walsworth, Dean's Representative



This thesis presents the construction and characterization of an experimental apparatus to produce sodium Bose-Einstein condensates (BECs) in  arbitrary potentials.

Particular attention is devoted to the study of toroidal BECs as platforms for analogue cosmology models.

We also report the first results from this apparatus in which we we studied the red-shifting  and attenuation of azimuthal phonons in expanding toroidal BECs as well as  blue-shifting and amplification of azimuthal phonons in contracting toroidal BECs.

The amplification and attenuation of the azimuthal phonons is the result of a fictitious friction term that arises from the changing metric dictated by the background BEC, this fictitious friction is analogous to the Hubble friction term present in models of the inflaton in cosmology.