Dynamical selection of the primordial density fluctuation amplitude |
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Authors: | Lehners Jean-Luc Steinhardt Paul J |
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Affiliation: | Perimeter Institute for Theoretical Physics, 31 Caroline Street N, Waterloo, Ontario N2L 2Y5, Canada. |
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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. |
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