**Colloquium**

Friday, April 14, 2000

4:00 PM

Physics Building, Room 204

Note special time.

Note special room.

## "Superfluidity in low dimensions: beyond the mean-field theory"

**Eugene Kolomeisky , University of Virginia**

[Host: Joseph Poon]

ABSTRACT:

The Gross-Pitaevskii approximation is a long-wavelength theory widely used
to describe a variety of properties of dilute Bose condensates, in
particular trapped alkali gases. In this talk I will show that for
short-ranged repulsive interactions this theory fails in one and two spatial
dimensions, and appropriate low-dimensional modifications will be proposed.
The new theory has a universal character, and some of its implications such
as density profiles in confining potentials, superfluidity, solitons, and
self-similar solutions will be discussed.

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