2008/11/30 by V. Bardek, J. Feinberg, S. Meljanac · 6 citations
Mathematics · Physics and Astronomy · #Algebraic structures and combinatorial models #Amplitude #Compendium #Field (mathematics) #Field theory (psychology) #Generalization #Mathematical proof #Nonlinear Photonic Systems #Quasiparticle #Spectrum (functional analysis) #Topological Materials and Phenomena #cond-mat.str-el #hep-th #math-ph #math.MP
paper · pdf · doi:10.1016/j.aop.2009.12.004
published in Annals of Physics 325(3), 691-710 (Elsevier BV) · latex, 43 pages, no figures, published version
openalex publication_date 2009/12/29 · arxiv created 2010/02/13 · arxiv updated 2010/02/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 fifteen 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.