Dublin Quantum Field Theory Seminar

                            Synge Lecture Theatre
                    School of Mathematics, Hamilton Building
                             Trinity College Dublin

                                 Time: 4.15 pm

January 27      Jean-Bernard Bru (Dublin IAS)

                A new microscopic theory of superfluidity?

The first microscopic theory of superfluidity was originally found in
1947 by Bogoliubov in three revolutionary papers on the theory of
interacting Bose gas. His Weakly Imperfect Bose Gas (WIBG) coming from
the truncation of a full interacting gas was a starting point for this
theory. However, only very few rigorous results concerning his WIBG
and ansatzs were previously done until 1998-2000 where a first
rigorous analysis of this Bogoliubov model (WIBG) was found at all
temperatures and densities.  The aim of this talk is to do a more deep
analysis of the Bogoliubov theory, including all recent studies (2001)
and some new criticizes (2002-2003). Actually, this more detailed
analysis should give rise to an improvement of the microscopic theory
of superfluidity then explained at the end of this talk.





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