Primordial Perturbations Spectra in a Holographic Phase

TL;DR

This paper proposes a holographic early universe model where primordial perturbations originate from thermal fluctuations, predicting a slightly red scalar spectrum and a moderate tensor-to-scalar ratio, with testable observational implications.

Contribution

It introduces a novel holographic phase transition model for primordial perturbations, linking holographic thermal equilibrium to observable spectra in cosmology.

Findings

Scalar spectrum has a slight red tilt.

Tensor perturbation amplitude is moderate.

Results are similar to large field inflation models in the r-n_s plane.

Abstract

In this paper, we suppose that the universe begins in a holographic thermal equilibrium phase with the diverged correlation length, and the phase transition to the radiation phase of standard cosmology goes with the abrupt reducing of correlation length. In this case, the primordial perturbations may be induced by thermal fluctuations in this holographic phase. We calculate the spectra of this holographic primordial perturbations, and find that the scalar spectrum has a slightly red tilt and the tensor perturbation amplitude has a moderate ratio, which may be tested in coming observations. The results plotted in r-n_s plane is similar to that of large field inflation models. However, for fixed efolding number, they are generally in different positions.