Haloes of k-essence

By C. Armendariz-Picon, Eugene A. Lim. 2005

150 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e30e4bfe4836d6bb95fd0a9e6ed76fd619fa1dad

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Citations in the corpus

The imperfect fluid behind kinetic gravity braiding (2011, background): “, [8]) is that the gradient of the scalar field remains time-like: therefore these type of equilibrium configurations only exist in theories with shift-symmetric Lagrangians.”
Imperfect Dark Energy from Kinetic Gravity Braiding (2010, background): “[50] (see also the most recent paper [57] and older works [58, 59, 60, 61]) and claim that this superluminality does not imply any inconsistencies.”
Beyond the Cosmological Standard Model (2014, unknown): “Analyses of screening in these models can be found in [197–200, 465, 466], along with studies of large-scale sctructure [467, 468].”
Solid holography and massive gravity (2015, background): “A similar behaviour can be seen when discussing the perturbations of the k-essence [46, 57] and Galileons [58].”
k-Essence, superluminal propagation, causality and emergent geometry (2007, methodology): “[36, 33, 37, 38].”
Stable dark energy stars (2005, background): “[37], where an inhomogeneous spherically symmetric dark energy scalar field was considered, although the latter model does not allow a phantom crossing.”