On the Stability of Phantom K-essence Theories

Details On the Stability of Phantom K-essence Theories On the Stability of Phantom K-essence Theories

2005-11-18

arxiv.org/abs/astro-ph/0511562v2

Phys.Rev.D73:063522,2006

Astronomy and Astrophysics

Astrophysics

Replaced with accepted version (minor changes, 1 reference added). Revtex4, 4 pages (double column), 1 figure

Scientific paper

10.1103/PhysRevD.73.063522

We show that phantom dark energy, if it is described by a K-essence theory, has three fundamental problems: first, its hamiltonian is unbounded from below. Second, classical stability precludes the equation of state from crossing the ``Lambda-barrier'', $w_\Lambda=-1$. Finally, both the equation of state and the sound speed are unbounded -- the first, from below, the second, from above -- if the kinetic term is not bounded by dynamics.

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