Spectrum of Initial Perturbations in Open and Closed Inflationary Models

TL;DR

This paper analyzes the initial perturbation spectra in open and closed inflationary models, highlighting differences in CMB anisotropy effects and discussing potential anisotropies in open models.

Contribution

It provides a comparative analysis of scalar and tensor perturbations in open and closed inflationary universes, emphasizing observational implications.

Findings

Closed models show enhanced low multipole anisotropy.

Open models do not suppress low multipoles.

Potential preferred space direction in open models.

Abstract

Spectrum of initial scalar and tensor perturbations created during an inflationary stage producing a closed or open FRW universe now is discussed. In the closed case, the CMB temperature anisotropy ${\Delta T/T}$ generated by scalar perturbations is enhanced for low multipoles. It is argued that in the open case there is no suppression of low multipoles. A possibility of the existence of a preferred space direction in the open case is noted.