Inflationary predictions for scalar and tensor fluctuations reconsidered

Details Inflationary predictions for scalar and tensor fluctuations reconsidered Inflationary predictions for scalar and tensor fluctuations reconsidered

2005-07-19

arxiv.org/abs/astro-ph/0507455v3

Phys.Rev.Lett.96:111301,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; references updated; version accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.96.111301

We reconsider the predictions of inflation for the spectral index of scalar (energy density) fluctuations (n_s) and the tensor/scalar ratio (r) using a discrete, model-independent measure of the degree of fine-tuning required to obtain a given combination of (n_s, r). We find that, except for cases with numerous unnecessary degrees of fine-tuning, n_s is less than 0.98, measurably different from exact Harrison-Zel'dovich. Furthermore, if n_s \gtrsim 0.95, in accord with current measurements, the tensor/scalar ratio satisfies r \gtrsim 10^{-2}, a range that should be detectable in proposed cosmic microwave background polarization experiments and direct gravitational wave searches.

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