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This article is cited in 34 scientific papers (total in 34 papers)
The null energy condition and cosmology
I. Ya. Aref'eva, I. V. Volovich
Steklov Mathematical Institute, Russian Academy of Sciences
Abstract:
Field theories that violate the null energy condition {(}NEC{\rm)} are
of interest both for the solution of the cosmological singularity problem and
for models of cosmological dark energy with the equation of state parameter
$w<-1$. We consider two recently proposed models that violate the NEC.
The ghost condensate model requires higher-derivative terms in the action,
and this leads to a heavy ghost field and energy unbounded from below. We
estimate the rates of particle decay and discuss possible mass limitations to
protect the stability of matter in the ghost condensate model. The nonlocal
stringy model that arises from a cubic string field theory and exhibits
a phantom behavior also leads to energy unbounded from below. In this case,
the energy spectrum is continuous, and there are no particle-like excitations.
This model admits a natural UV completion because it comes from superstring
theory.
Keywords:
cosmology, string, D-brane
DOI:
https://doi.org/10.4213/tmf6188
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English version:
Theoretical and Mathematical Physics, 2008, 155:1, 503–511
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Article
Citation:
I. Ya. Aref'eva, I. V. Volovich, “The null energy condition and cosmology”, TMF, 155:1 (2008), 3–12; Theoret. and Math. Phys., 155:1 (2008), 503–511
Citation in format AMSBIB
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