Dynamical Selection of the Primordial Density Fluctuation Amplitude
High Energy Physics - Theory
2011-03-02 v2 Cosmology and Nongalactic Astrophysics
Abstract
In inflationary models, the predicted amplitude of primordial density perturbations Q is much larger than the observed value (~10^{-5}) for natural choices of parameters. To explain the requisite exponential fine-tuning, anthropic selection is often invoked, especially in cases where microphysics is expected to produce a complex energy landscape. By contrast, we find examples of ekpyrotic models based on heterotic M-theory for which dynamical selection naturally favors the observed value of Q.
Cite
@article{arxiv.1008.4567,
title = {Dynamical Selection of the Primordial Density Fluctuation Amplitude},
author = {Jean-Luc Lehners and Paul J. Steinhardt},
journal= {arXiv preprint arXiv:1008.4567},
year = {2011}
}
Comments
4 pages; v2: version to be published in PRL