# CMB in nonstandard cosmology: A first look

## TL;DR

This paper explores how nonstandard cosmological models affect the Cosmic Microwave Background (CMB), particularly focusing on the Sachs-Wolfe effects and how low-multipole CMB data can inform matter density estimates.

## Contribution

It provides the first analysis of CMB in a specific nonstandard cosmological background using previously computed metric perturbations.

## Key findings

- Small-multipole CMB data can constrain the matter density of the Universe.
- The study discusses the Sachs-Wolfe and integrated Sachs-Wolfe effects in nonstandard cosmology.
- Provides insights into the impact of nonstandard backgrounds on CMB observations.

## Abstract

We study CMB in the nonstandard background cosmology recently investigated. Using the previously calculated first order metric perturbations we discuss the Sachs-Wolfe and the integrated Sachs-Wolfe effects. We show how small-multipole CMB data can be used to determine the matter density of the Universe.