Inflation versus cyclic predictions for spectral tilt
Feb, 2003Citations per year
Abstract: (arXiv)
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.Note:
- 4 pages, no figures: discussion of cyclic model updated: final version to appear in PRL
- inflation
- cosmic background radiation: anisotropy
- density: fluctuation
- perturbation: scalar
- perturbation: tensor
- model: ekpyrotic
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