Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-05-26
Phys.Rev. D67 (2003) 103519
Physics
High Energy Physics
High Energy Physics - Theory
19 pages, 1 eps figures
Scientific paper
10.1103/PhysRevD.67.103519
Observational evidence suggests that our universe is presently dominated by a dark energy component and undergoing accelerated expansion. We recently introduced a model, motivated by string theory for short-distance physics, for explaining dark energy without appealing to any fine-tuning. The idea of the transplanckian dark energy (TDE) was based on the freeze-out mechanism of the ultralow frequency modes, $\omega(k)$ of very short distances, by the expansion of the background universe, $\omega(k) \leq H$. In this paper we address the issue of the stress-energy tensor for the nonlinear short-distance physics and explain the need to modify Einstein equations in this regime. From the modified Einstein equations we then derive the equation of state for the TDE model, which has the distinctive feature of being continually time-dependent. The explanation of the coincidence puzzle relies entirely on the intrinsic time-evolution of the TDE equation of state.
Bastero-Gil Mar
Mersini Laura
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