The New Ekpyrotic Ghost

Details The New Ekpyrotic Ghost The New Ekpyrotic Ghost

2007-12-13

arxiv.org/abs/0712.2040v3

JCAP 0804:018,2008

Physics

High Energy Physics

High Energy Physics - Theory

24 pages, 5 figs

Scientific paper

10.1088/1475-7516/2008/04/018

The new ekpyrotic scenario attempts to solve the singularity problem by involving violation of the null energy condition in a model which combines the ekpyrotic/cyclic scenario with the ghost condensate theory and the curvaton mechanism of production of adiabatic perturbations of metric. The Lagrangian of this theory, as well as of the ghost condensate model, contains a term with higher derivatives, which was added to the theory to stabilize its vacuum state. We found that this term may affect the dynamics of the cosmological evolution. Moreover, after a proper quantization, this term results in the existence of a new ghost field with negative energy, which leads to a catastrophic vacuum instability. We explain why one cannot treat this dangerous term as a correction valid only at small energies and momenta below some UV cut-off, and demonstrate the problems arising when one attempts to construct a UV completion of this theory.

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