Haloes of k-essence

C. Armendariz-Picon, Eugene A. Lim

Research output: Contribution to journalReview articlepeer-review

94 Scopus citations


We study gravitationally bound static and spherically symmetric configurations of k-essence fields. In particular, we investigate whether these configurations can reproduce the properties of dark matter haloes. The classes of Lagrangians we consider lead to non-isotropic fluids with barotropic and polytropic equations of state. The latter include microscopic realizations of the often-considered Chaplygin gases, which we find can cluster into dark matter halo-like objects with flat rotation curves, while exhibiting a dark energy-like negative pressure on cosmological scales. We complement our studies with a series of formal general results about the stability and initial value formulation of non-canonical scalar field theories, and we also discuss a new class of de Sitter solutions with spacelike field gradients.

Original languageEnglish (US)
Pages (from-to)113-139
Number of pages27
JournalJournal of Cosmology and Astroparticle Physics
Issue number8
StatePublished - Aug 1 2005


  • Dark energy theory
  • Dark matter
  • Structure of galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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