Inflation in a scale invariant universe [CEA]

http://arxiv.org/abs/1802.06069


A scale-invariant universe can have a period of accelerated expansion at early times: inflation. We use a frame-invariant approach to calculate inflationary observables in a scale invariant theory of gravity involving two scalar fields – the spectral indices, the tensor to scalar ratio, the level of isocurvature modes and non-Gaussianity. We show that scale symmetry leads to an exact cancellation of isocurvature modes and that, in the scale-symmetry broken phase, this theory is well described by a single scalar field theory. We find the predictions of this theory strongly compatible with current observations.

Read this paper on arXiv…

P. Ferreira, C. Hill, J. Noller, et. al.
Mon, 19 Feb 18
25/41

Comments: 9 pages, 2 figures