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A dark energy model interacting with dark matter and unparticle

Songbai Chen1,2 and Jiliang Jing1,2

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We study dynamical behaviors of dark energy models interacting with dark matter and unparticle in the standard flat Friedmann–Robertson–Walker cosmology. We considered four different interacting models and examined the stability of the critical points. We find that there exist late-time scaling attractors corresponding to an accelerating universe, and the alleviation of the coincidence problem depends on the choice of parameters in the models.


PACS

95.35.+d Dark matter (stellar, interstellar, galactic, and cosmological)

95.36.+x Dark energy

95.30.Sf Relativity and gravitation

04.20.Jb Exact solutions

98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)

MSC

83C05 Einstein's equations (general structure, canonical formalism, Cauchy problems)

85A40 Cosmology (For relativistic cosmology, see 83F05)

83F05 Cosmology

Subjects

Gravitation and cosmology

Particle physics and field theory

Astrophysics and astroparticles

Dates

Issue 15 (7 August 2009)

Received 13 March 2009, in final form 20 May 2009

Published 8 July 2009



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