Density waves in the Calogero model - revisited

V. Bardek, J. Feinberg, S. Meljanac

Research output: Contribution to journalReview articlepeer-review


The Calogero model bears, in the continuum limit, collective excitations in the form of density waves and solitary modulations of the density of particles. This sector of the spectrum of the model was investigated, mostly within the framework of collective-field theory, by several authors, over the past 15 years or so. In this work we shall concentrate on periodic solutions of the collective BPS-equation (also known as "finite amplitude density waves"), as well as on periodic solutions of the full static variational equations which vanish periodically (also known as "large amplitude density waves"). While these solutions are not new, we feel that our analysis and presentation add to the existing literature, as we explain in the text. In addition, we show that these solutions also occur in a certain two-family generalization of the Calogero model, at special points in parameter space. A compendium of useful identities associated with Hilbert transforms, including our own proofs of these identities, appears in Appendix A. In Appendix B we also elucidate in the present paper some fine points having to do with manipulating Hilbert-transforms, which appear ubiquitously in the collective field formalism. Finally, in order to make this paper self-contained, we briefly summarize in Appendix C basic facts about the collective field formulation of the Calogero model.

Original languageEnglish
Pages (from-to)691-710
Number of pages20
JournalAnnals of Physics
Issue number3
StatePublished - Mar 2010

Bibliographical note

Funding Information:
This work was supported in part by the Ministry of Science and Technology of the Republic of Croatia under contract No. 098-0000000-2865 and by the US National Science Foundation under Grant No. PHY05-51164 .


  • BPS
  • Calogero model
  • Collective-field theory
  • Solitons

ASJC Scopus subject areas

  • General Physics and Astronomy


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