No-go theorem for k-essence dark energy

Details No-go theorem for k-essence dark energy No-go theorem for k-essence dark energy

2006-06-23

arxiv.org/abs/astro-ph/0606584v2

Phys.Rev.Lett. 97 (2006) 081303

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. Replaced with revised version accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.97.081303

We demonstrate that if k-essence can solve the coincidence problem and play the role of dark energy in the universe, the fluctuations of the field have to propagate superluminally at some stage. We argue that this implies that successful k-essence models violate causality. It is not possible to define a time ordered succession of events in a Lorentz invariant way. Therefore, k-essence cannot arise as low energy effective field theory of a causal, consistent high energy theory.

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