Plasma Perturbations and Cosmic Microwave Background Anisotropy in the Linearly Expanding Milne-like Universe

TL;DR

This paper explores how primordial plasma perturbations in a Milne-like universe affect CMB anisotropies, proposing an inflation-free model that aligns with some cosmological observations.

Contribution

It introduces a novel approach to primordial plasma evolution in Milne-like universes using five-vectors gravity, offering an alternative to inflationary models.

Findings

Qualitative calculation of CMB spectrum in the model

Potential resolution of cosmological constant problem

Support for inflation-free cosmological scenarios

Abstract

We expose the scenarios of primordial baryon-photon plasma evolution within the framework of the Milne-like universe models. Recently, such models find a second wind and promise an inflation-free solution of a lot of cosmological puzzles including the cosmological constant one. Metric tensor perturbations are considered using the five-vectors theory of gravity admitting the Friedmann equation satisfied up to some constant. The Cosmic Microwave Background (CMB) spectrum is calculated qualitatively.