Anomalous dispersion of density waves in the early universe with positive cosmological constant

TL;DR

This paper investigates how density perturbations and acoustic waves behave anomalously in a flat universe with radiation and a positive cosmological constant, revealing unique dispersion phenomena.

Contribution

It introduces the concept of anomalous dispersion of density waves in the early universe with a positive cosmological constant, expanding understanding of cosmic perturbations.

Findings

Identification of anomalous dispersion of acoustic waves

Analysis of density perturbations in a universe with $ ho=rac{ ext{radiation}}{ ext{cosmological constant}}$

Discussion of implications for early universe cosmology

Abstract

Density perturbations in the flat (K=0) Robertson-Walker universe with radiation ($p=\epsilon/3$) and positive cosmological constant ($\Lambda>0$) are investigated. The phenomenon of anomalous dispersion of acoustic waves on $\Lambda$ is discussed.