Phys. Rev. Lett. 97, 081303 (2006) [4 pages]No-Go Theorem for k-Essence Dark EnergyReceived 23 June 2006; published 25 August 2006 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 a low energy effective field theory of a causal, consistent high energy theory. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.081303
DOI:
10.1103/PhysRevLett.97.081303
PACS:
95.36.+x, 11.30.Cp
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