Kinematics of an Ideal Fluid into a Spatially Flat Anisotropic Axisymmetric Universe

TL;DR

This paper explores an anisotropic cosmological model with axisymmetry, analyzing the fluid dynamics within a modified Friedmann-Lemaitre-Robertson-Walker metric to address anomalies in cosmic microwave background data.

Contribution

It introduces a transformation to spherical coordinates with different scale factors, deriving a flat spatial anisotropic universe model and analyzing ideal fluid kinematics.

Findings

The model accommodates observed CMB anomalies.

The axisymmetric approach provides new insights into universe anisotropies.

Fluid behavior analysis supports potential explanations for temperature fluctuations.

Abstract

The Standard Cosmological Model assumes that the Universe is, on average, homogeneous and isotropic for large scales (z>1), but this principle has been questioned from the results about Cosmic Microwave Background. This radiation has anomalies that are not explained from the Standard Model, such as temperature fluctuations in the order of 10-5K or aligning polar moments. These anomalies could be explained by anisotropic cosmological models. We propose a transformation to spherical coordinates considering different temporal scale factors in the Cartesian axes, from which a reducible to flat spatial Friedmann-Lemaitre-Robertson-Walker metric is obtained. In the model, we consider the axisymmetric case and analyze the cinematic behavior of an ideal fluid at rest.