Inflation versus Cyclic Predictions for Spectral Tilt

Preprint

6 September 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0302012

Abstract

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.

Keywords

EKPYROTIC/CYCLIC MODELS
INDEPENDENT ESTIMATE
ESTIMATE THAT YIELDS
CYCLIC PREDICTIONS
SPECTRAL TILT
ANISOTROPY
INFLATION
SIMPLEST
TILT

All Related Versions

Version 1, 2003-02-03, ArXiv
Version 2, 2003-02-10, ArXiv
Version 3, 2003-09-06, ArXiv
Published version: Physical Review Letters, 91 (16), 161301.

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