Dynamical Selection of the Primordial Density Fluctuation Amplitude

Details Dynamical Selection of the Primordial Density Fluctuation Amplitude Dynamical Selection of the Primordial Density Fluctuation Amplitude

2010-08-26

arxiv.org/abs/1008.4567v2

Phys.Rev.Lett.106:081301,2011

Physics

High Energy Physics

High Energy Physics - Theory

4 pages; v2: version to be published in PRL

Scientific paper

10.1103/PhysRevLett.106.081301

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.

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