Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities

TL;DR

This paper explores thermal inflation within double-screen entropic cosmology, analyzing primordial perturbations and non-Gaussianities, and finds results consistent with observations and potential for sizable non-Gaussian signals.

Contribution

It extends entropic cosmology models by studying thermal inflation, primordial perturbations, and non-Gaussianities, highlighting the role of holographic screens in these phenomena.

Findings

Power spectrum is nearly scale-invariant with a red tilt.

Tensor-to-scalar ratio aligns with observational data.

Non-Gaussianities can be sizable due to holographic statistics.

Abstract

We investigate thermal inflation in double-screen entropic cosmology. We find that its realization is general, resulting from the system evolution from non-equilibrium to equilibrium. Furthermore, going beyond the background evolution, we study the primordial curvature perturbations arising from the universe interior, as well as from the thermal fluctuations generated on the holographic screens. We show that the power spectrum is nearly scale-invariant with a red tilt, while the tensor-to-scalar ratio is in agreement with observations. Finally, we examine the non-Gaussianities of primordial curvature perturbations, and we find that a sizable value of the non-linearity parameter is possible due to holographic statistics on the outer screen.