Inflation versus Cyclic Predictions for Spectral Tilt

Details Inflation versus Cyclic Predictions for Spectral Tilt Inflation versus Cyclic Predictions for Spectral Tilt

2003-02-03

arxiv.org/abs/astro-ph/0302012v3

Phys.Rev.Lett.91:161301,2003

Astronomy and Astrophysics

Astrophysics

4 pages, no figures; discussion of cyclic model updated; final version to appear in PRL

Scientific paper

10.1103/PhysRevLett.91.161301

We present a simple, nearly model-independent estimate that yields the predictions of the simplest inflationary and ekpyrotic/cyclic models for the spectral tilt of the primordial density inhomogeneities. Remarkably, we find that the simplest models yield an identical result: n_s is approximately 0.95. For inflation, the same estimate predicts a ratio of tensor to scalar contributions to the low multipoles of the microwave background anisotropy of T/S=20%; the tensor contribution is negligible for ekpyrotic/cyclic models.

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