Title

Haloes of k-Essence

Author(s)/Creator(s)

Christian Armendariz-Picon, Syracuse UniversityFollow
Eugene A. Lim, Yale University

Document Type

Article

Date

6-20-2005

Language

English

Disciplines

Physics

Description/Abstract

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.

Additional Information

34pages, single column double spacing, 7 figures, 3 Tables, RevTex4. Additional references and minor clarifications. To be submitted to JCAP More information at http://arxiv.org/abs/astro-ph/0505207

Recommended Citation

Armendariz-Picon, Christian and Lim, Eugene A., "Haloes of k-Essence" (2005). Physics - All Scholarship. 216.
https://surface.syr.edu/phy/216

Source

Harvested from Arxiv.org

Creative Commons License

This work is licensed under a Creative Commons Attribution 3.0 License.