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High Energy Physics Seminars
High Energy
Wednesday, January 30, 2013
3:30 PM
Physics Building, Room 204

Mark Alford
[Host: Diana Vaman]
Washington University in St. Louis
"How to understand superfluids using field theory"

ABSTRACT:
The hydrodynamic description of a superfluid at nonzero temperature is the twofluid model, where the two fluids are the superfluid and a normal fluid. The superfluid is a BoseEinstein condensate, and the normal fluid is a thermal gas of phonons.
I will show how one can translate between the macroscopic twofluid model and a microscopic field theoretic description, using the simplest field theory that can show BoseEinstein condensation, namely the complex scalar field.
Questions that will be answered include:
* How can one get two fluids from a single field?
* What is the relationship between the different formalisms that have been proposed for relativistic superfluids?
* What is the role of the Goldstone boson? 



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physspeakers@Virginia.EDU.
Please include the seminar type (e.g. High Energy Physics Seminars), date, name of the speaker, title of talk, and an abstract (if available).
