By K. Ohbayashi, M. Watabe (auth.), Professor Kohji Ohbayashi, Professor Mitsuo Watabe (eds.)

This quantity is the court cases of the Hiroshima Symposium on effortless Excitations in Quantum Fluids, which used to be hung on August 17 and 18, 1987, in Hiroshima, Japan, and used to be attended by way of thirty-two scientists from seven international locations. Quantum fluids were the topic of severe research as a result of their superfluid houses at very low temperatures. basic excitations in them are an immense suggestion approximately which many vital discoveries were made lately. This symposium was once prepared through a bunch of physicists from Hiroshima collage to supply a chance to debate those fresh advancements. It was once conceived as a satellite tv for pc convention of the 18th foreign convention on Low Temperature Physics (LT 18), which was once held in Kyoto, August 20-26, 1987. Emphasis was once put on the dynamic constructions and correlations of ele mentary excitations, which ended in invited audio system being chosen from this box. in spite of the fact that, enthusiastic members mentioned amazing new effects on a number of different facets of the trouble-free excitations, which made the sympo sium vigorous and winning. it truly is our nice pride to offer this quantity, along with papers of fine caliber and originality. We thank all of the parti cipants for his or her cooperation all through this symposium, and for getting ready their manuscripts inside an inexpensive time.

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On the other hand, S(Q,w) has now only a broad spectrum. No zero-sound mode exists because the density is too small to sustain a well defined self-consistent-field. ;no couples G(Q,w) and S(Q,w) with the result that the renormalized pole of G(Q,w) appears in S(Q,w) with a weight related to no. Because the condensate fraction no of a WIDBG may be close to 100% (at T = OK), the condensate renormalization of W2 is significant. Surprisingly, the final result of detailed microscopic caiculations [6] is that at intermediate temperatures, one has to a good approximation W2(Q) ]!

In Section 3, we sketch what the same formalism predicts for a WIDBG at finite temperatures [6]. Quite apart from the possible physical realization of such Bose gases in the laboratory over the next few years, the contrast between the nature of the elementary excitations in Bose gases and liquids gives one considerable insight into the role of the Bose condensate. 2. EXCITATIONS IN A BOSE LIQUID To begin with, we recall that in the field-theoretic analysis, the elementary excitations are defined in a very precise manner as the resonances (poles) of the single-particle Green's function G(Q,w).

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