Holographic Cosmology 3.0

TL;DR

This paper introduces an updated holographic cosmology model compatible with observations, featuring a primordial $p= ho$ phase, a brief matter era, and inflation, explaining the origin of scale-invariant cosmic microwave background fluctuations.

Contribution

It proposes a new holographic cosmology framework with a $p= ho$ phase that naturally solves flatness and horizon problems, and generates observable scale-invariant fluctuations.

Findings

Fluctuations are generated during the $p= ho$ era and are exactly scale invariant.

The model's parameters are theoretically calculable but not yet precisely determined.

The fluctuation spectrum exhibits a sharp cutoff at both ends, with potential observational implications.

Abstract

We present a new version of holographic cosmology, which is compatible with present observations. A primordial $p=\rho$ phase of the universe is followed by a brief matter dominated era and a brief period of inflation, whose termination heats the universe. The flatness and horizon problems are solved by the $p=\rho$ dynamics. The model is characterized by two parameters, which should be calculable in a more fundamental approach to the theory. For a large range in the phenomenologically allowed parameter space, the observed fluctuations in the cosmic microwave background were generated during the $p=\rho$ era, and are exactly scale invariant. The scale invariant spectrum cuts off sharply at both upper and lower ends, and this may have observational consequences. We argue that the amplitude of fluctuations is small but cannot yet calculate it precisely.